Day seven of the US Open saw the Williams sisters both progress from their respective matches to set up a sibling quarter-final at Flushing Meadows.
Venus overcame Anett Kontaveit in less than an hour to seal her place in the last eight, and she was soon followed by Serena, who beat fellow American Madison Keys in straight sets.
Elsewhere, Novak Djokovic needed four sets to get past Roberto Bautista Agut, while defending champion Marin Cilic safely booked his place in the next round at the expense of Jeremy Chardy.
Find out how all of the action unfolded with Sports Mole's live coverage below.
Good afternoon! Welcome to Sports Mole's live coverage of day seven of the US Open. We go into the last-16 stage, and it's a tasty day of tennis in store. Marin Cilic, the defending champion, is in action first against Jeremy Chardy, and that's followed by the Williams sisters. Venus is up first against Anett Kontaveit before Serena plays American youngster Madison Keys.
If that isn't enough for you, then Novak Djokovic follows at around midnight. He plays Ricardo Bautista Agut.
Meanwhile in the men's doubles, Brit Dominic Inglot is in action with Robert Lindstedt. They have a tough match against Tommy Haas and Radek Stepanek. That one gets underway shortly too, and I'll keep you up to date with everything that goes on there.
Marin Cilic and Jeremy Chardy have just come on court. Cilic hasn't had it all his own way so far this tournament. He didn't drop a set in the first two rounds but Kazakhstan's Mikhail Kukushkin took him to five sets.
As for Chardy, he took the scalp of David Ferrer in round three and in some style too, coming out as 7-6 4-6 6-3 6-1 winner. Can the 27th seed pull off another shock today?
Just before this match starts, a bit of news from elsewhere for you. Stanislas Wawrinka has spoken ahead of his match against Donald Young and it's one he's looking forward to. Read the full story here
We're underway at Arthur Ashe! Cilic to serve and he sends an early message to Chardy. Conceding just one point, a cross-court winner and an ace finishes the game. Good start for the reigning champion.
Chardy has a response of his own, winning his first point of serve and sending an ace past Cilic to make it 30-0. The first unforced error of the match comes as Cilic hits wide. The Croat pulls two points back but Chardy wins the game when Cilic hits wide with a volley.
A Chardy slice hits the tramline and the Frenchman takes the point with his next shot. He then hits the net from the baseline. The score then moves up to 30-30 and Chardy fails to return Cilic's serve to give the ninth seed a chance for the game. He duly takes it as an awkward bounce on a second serve leads to an ace.
Chardy takes a two-point lead before hitting long. Cilic makes an error of his own when he hits the net from the baseline and Chardy aces down the middle to claim the game.
Cilic's serve twice goes unreturned and Chardy hits the net to make it 40-0. It's a love game when Cilic sends Chardy running and the Frenchman fires long.
BREAK! An error and a two successive double faults give Cilic three chances to break. Chardy wins one back but then slices into the net. That was an absolute gift of a break.
Cilic attacks from the serve and wins the opening point with a volley. It's level when Cilic hits the net, and both players hit wide in the next two points. It's break point for Chardy as he takes advantage of a soft Cilic shot but Cilic responds with a 122mph ace. Chardy gets a second chance when Cilic misses the target but another serve causes problems. Finally, Cilic has a chance to win the game when Chardy goes long, and the Frenchman returns the next serve wide.
Chardy races into a 40-0 lead as Cilic twice hits it out. The love game is complete with an ace down the middle. What a way to respond from Chardy! Cilic serving for the set now...
SET! Ace, ace, ace! Three aces, all down the middle, give Cilic three match points. He hits the net with his first one, but his next serve causes Chardy to return wide and the set is over.
Another Pole has been talking about another American ahead of the fourth-round. This time, it's Roger Federer on his opponent John Isner.
"I'm looking forward to find out. Played John here in the past. Also I think it was Labor Day weekend. Third round maybe? The crowds were really pumped up to see how massive he was clocking the serves. It was a joke in the first set. I remember that. Yeah, I expect the crowd to be on his side," he said in a press conference.
Chardy's serve was inconsistent in the first set, but it's better in the opening game. An ace takes the score up to 40-15, before Cilic pulls a shot back. Another ace went past Cilic and, after a review, the game is complete.
Cilic's serve now causes problem as he races into a 40-0 lead. His next serve down the middle causes Chardy to go long. Love game for Cilic.
After a baseline rally, Cilic hits the net but the score is leveled with the next point. Chardy's powerful serve is straight at Cilic and the Croat hits the net once again. A double fault in the next point takes the score to 30-30 and good attacking play from Chardy gives him the chance for the game, which he duly takes.
Chardy returns Cilic's opening serve long and hits the next one into the net. The score moves to 40-0 when Chardy hits out and the Frenchman can't return the next serve either. Cilic completely dominant on serve so far.
Chardy hasn't quite got his serve together yet. He wins the first point but then double faults. A winner down the line gives Chardy a 30-15 lead and a cross-court winner gives him two chances to take the game. Cilic goes long and Chardy wins the game.
BREAK! Cilic hits the net but bounces straight back with an ace. The pair then trade points before Chardy gets a break point as Cilic again hits the net. Cilic's shot is called good, but Chardy challenges. And it's a great challenge - the ball was an inch wide! Chardy takes control of the set.
A point each at the start of the game, before Chardy gives Cilic the runaround and beats him down the line. Cilic forces Chardy to hit the net, and then has a chance to break when Chardy hits long. Cilic is unable to cope with a sliced serve, and Chardy takes advantage with an ace down the middle. Cilic hits the net and Chardy extends his lead.
SET! Chardy starts the game in style, hitting a forehand winner off Cilic's serve. Cilic hits back, but Chardy takes it to 15-30 when he comes to the net. An ace levels it but Cilic hits wide to give his opponent a set point. A lovely cross-court winner wins the set for Chardy!
UPDATE: As previously mentioned, Britain's Dominic Inglot is in doubles action with Swede Robert Lindstedt. They have a toe in the quarter-final and are leading veterans Tommy Haas and Radek Stepanek 6-4 4-3.
In other news, there's been more reaction from Andy Murray after his win over Thomaz Bellucci last night. He's pleased with his progress.
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Chardy wins the opening two points on his serve, before Cilic hits a winner. It's 40-15 when a Chardy serve causes problems his opponent and the game is sealed when the ball is hit wide.
Cilic hits the net at the start of the game and a change of racket doesn't fix things when he puts one wide after a long rally. He pulls it back though when Chardy hits long, and then hits the net. He wins the next point and sends a winner down the line to complete the recover.
Chardy takes a 30-0 lead after two quick points, and Cilic then returns a serve long. Chardy completes the love game when Cilic misses the target.
Two good serves give Cilic a 30-0 lead when Chardy can't return. He continues with an ace down the middle but Chardy pulls one back with a cross-court volley, and then another when Cilic goes long. The game is complete with another dominant serve which Chardy can't get a proper connection on.
Cilic hits long in the third point to give Chardy a 30-15 lead. He then extends it with a powerful unreturnable serve, and takes the game when Cilic misses the target.
Cilic is in trouble when he hits the net, and then goes out for 0-30. He strikes back though, coming to the net and volleying past Chardy. Chardy does well to return a powerful serve, but Cilic attacks and sends the ball cross-court for a winner before the Croat has a chance to take the game when Chardy hits wide. Cilic takes it with aplomb, acing down the middle.
Chardy starts the game with a double fault but levels with the next point. After a cross-court rally, Cilic changes direction but the ball goes out, and Chardy extends his lead when he forces another error. An ace down the middle finishes the game.
UPDATE: A quick look at what's going on elsewhere then, and French duo Benoit Paire and Jo-Wilfried Tsonga have just started their match at Grandstand.
In the Louis Armstrong Stadium, Dominic Inglot and Robert Lindstedt have secured their place in the men's doubles quarter-final with a 4-6 3-6 win over Tommy Haas and Radek Stepanek.
Cilic takes the opening point but then hits the net with most of the court open for a winner. He slams a cross-court shot past Chardy, but makes another error as the score moves to 30-30. Chardy's shot goes narrowly long and Cilic takes the game when his serve is returned out.
Chardy takes a 30-0 lead with an excellent shot down the line, and the Frenchman's serve isn't returned in the next shot. He misses the chance of a love game when he fires long, and Cilic wins a second point in style, with a cross-court volley after Chardy had chased down a drop shot. That's all for nothing though - a shot into the net on the next point gives Chardy the game.
Cilic's serve is again proving productive. Chardy hardly gets his racket on the ball that game, as two aces and two serves not returned leads to an easy love game for Cilic.
Chardy takes the first two points with an ace and a cross-court winner. A double fault follows, his ninth of the match, but Chardy comes to the net to beat Cilic and give himself a 40-15 lead. Cilic hits back with a shot down the line, but can't return Chardy's next serve.
We're going to a tiebreak! Cilic wins the first point with his second shot, and then aces. He then goes long and wide, but another ace gives him two chances to win the game. Chardy goes long and Cilic takes the game.
2-0 to Cilic as he wins the first point then sends an ace down the middle.
The pair exchange points and Cilic still holds a 3-1 lead.
Chardy makes an error, hitting the net, and Cilic sends another ace down to take the score to 5-1.
Another ace from Cilic makes it 6-1. Five set points!
SET! Cilic sends his return into the net, but then pulls one out of the bag to send one down the line for the winner. 7-2!
The pair exchange points to 30-30 before Chardy puts his shot out. The Frenchman challenges but to no avail, and Cilic aces for the 19th time to take the game.
BREAK! A winner, and a Chardy error gives Cilic a 0-30 lead. That's extended when Chardy hits the net, and Cilic breaks to love when another Chardy shot goes into the net. Cilic in control of the match now!
Cilic takes the first two points, but then goes wide left. Another error takes it to 30-30 but Cilic responds with an ace down the middle. Yet another ace comes in the next one and Cilic stretches his lead.
Two good aces give Chardy a 30-0 lead, but the Frenchman hits the net with the next point. Cilic controls the next point from the start and passes down the left to level. It's break point as Cilic hits another winner, and the Croat converts when Chardy goes long. Surely it's plain sailing for Cilic from here.
Cilic really has served superbly this afternoon, and it helps him to a 30-0 lead. Chardy wins the next point though with both players coming to the net and Cilic volleying into it. The Croat goes long twice to give Chardy a break point. Cilic responds with an ace, but a double fault in the next point gives Chardy a second chance. Another ace, another deuce. Cilic hits the net. Will it be third time lucky for Chardy? No. A careless volley goes wide. A passing shot gives Cilic a chance to take the game, and he makes no mistake by powering the ball down the line. Chardy now serving to stay in the match.
That's better from Chardy. They share the first two points, before Chardy aces Cilic. A short serve is returned wide, and another ace secures the game. A hold for Cilic would win the match.
GAME, SET & MATCH! Cilic does well on the first shot, sending a powerful forehand which Chardy can only return into the net. A shot down the line gives him a 30-0 lead but Chardy gets one back with a return winner. The score is leveled after a double fault but Cilic gives himself match point with a winner down the line. Chardy sends his shot into the net and Cilic advances to the quarter-finals!
In the end, it was fairly easy for Cilic. The tie-break, a 7-2 win for Cilic, was the turning point. After that Cilic came out in the fourth set like a man possessed. Chardy seemed to lose all his confidence from that point onwards.
UPDATE: Jo-Wilfried Tsonga is one set up against Benoit Paire and leads the second set 3-2.
The winner will play Cilic in the quarter-final.
Elsewhere on Sports Mole, read the report from Dominic Inglot and Robert Lindstedt's fourth-round doubles victory over Tommy Haas and Radek Stepanek.
Rafael Nadal has been speaking after his defeat to Italy's Fabio Fognini on Friday night. He's trying to take the positives out of the loss.
"For the nerves, for the anxiousness that I had for a long time this season, I was not able to do it. I was not able to be fighting the way that I was fighting today. So it is an improvement for me. I take that like a positive thing," he said.
Next up for us though, it's a famous pair of sisters. Venus meets Estonia's Anett Kontaveit shortly, and that will be followed by Serena's meeting against exciting American youngster Madison Keys.
If they both win today, they'll meet each other in the quarter-finals.
They met in the 2002 US Open final:
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SET! Tsonga has doubled his lead over Paire. It looks like he'll be Cilic's next opponent in two days time. 6-4 6-3 in that one.
Venus and Kontaveit are on court and will be underway shortly.
It's their first meeting, with 130 ranking places separating them. Kontaveit has burst onto the scene in the past week after coming through three qualifying matches. That included a victory over Britain's Naomi Broady.
She then overcame Casey Dellacqua, 31st seed Anastasia Pavlyuchenkova and Madison Brengle and has dropped just one shot in the process.
As for Venus's knowledge of the Estonian 19-year-old: "Not a lot".
She's nearly double her age but surely Venus will be too powerful for Kontaveit tonight.
Here we go then!
Venus starts with a double fault, and Kontaveit then hits a winner down the line. Venus then gets her trademark serve flying straight past the youngster, and Kontaveit can't return her next one as the score goes to 30-30. Kontaveit goes long after a long rally, and Venus takes the game when Kontaveit hits the net.
Venus hits it long, and Kontaveit follows it up with an ace down the middle. Venus struggles to return her next serve and Kontaveit powers it past Venus for 40-0. The love game is complete when Venus hits the net. Very impressive from Kontaveit!
A Venus smash opens the game but she then goes wide. A powerful serve down the middle goes back into the net, and Kontaveit hits her next return long. Kontaveit hasn't quite got to grips with Venus's serve, and the game is over.
BREAK! The pair share points at the start of the game, and Kontaveit takes a 30-15 lead with a cross-court forehand. The Estonian hits it wide and Venus gets the break point when a shot goes into the net. Kontaveit goes well wide and Venus has the lead.
Venus is off to a flyer and takes the 4-1 lead with a love game. Kontaveit looks like she's come to the end of the road.
Kontaveit takes a 30-0 lead but then double faults. Venus returns the next serve into the net and Kontaveit takes the game with the next point. Much better from Kontaveit.
A second successive love game for Venus on her serve, and she means business this afternoon. Kontaveit now serving to stay in the set.
SET! Kontaveit takes the 30-15 lead, before a fantastic rally finishes with a backhand from Venus that skims the baseline. Venus gets the set point, overpowering Kontaveit, but sends the ball long for deuce. Venus then wins the point, and Kontaveit hits long to finish the set.
UPDATE: Tsonga is through to the quarter-finals after a 6-4 6-3 6-4 victory over Paire. He'll play Cilic on Tuesday.
Venus sends a winner down the line but then makes an error. Again, she overpowers Kontaveit to take the score to 30-15. An unreturned serve, followed by an ace wins the game for Venus.
BREAK! Kontaveit's forehand is strong and helps her to 30-15 with a pair of winners. Two successive double faults gifts Venus the break point and Kontaveit goes long. It will be a tall order to come back from that.
Williams wins the first two points, but leaves one short and Kontaveit powers a forehand past her. A cross-court rally ends with Kontaveit hitting the net, but a terrific return forces Venus into an error. Kontaveit hits the ball out on the next shot and Venus takes the game.
Click here for the full report of Tsonga's fourth-round victory over Paire
BREAK! Kontaveit can't quite cope coming up against someone of Venus's stature. She twice hits out as Venus goes 0-30, and it's three break points when she fails to reach a powerful baseline shot. Kontaveit misses the target again. We're closing in on the finish now.
Kontaveit fails to return two serves and then hits wide of the right tramline. Venus takes the game and is just one game from victory now.
Kontaveit takes the first point as Venus hits long, and then doubles her lead with a winner. Another shot off target for Venus precedes a return into the net as Kontaveit wins a love game. Venus to serve for the match.
GAME, SET & MATCH! Kontaveit takes the first point, but is unable to cope with a terrific baseline shot. A shot into the corner gives Venus a 30-15 lead, but she then hits the net after a long rally. Kontaveit gets the break point with a winner but goes long. Venus gets the advantage, and wins the match when Kontaveit hits wide.
The romantics among us hoped that Kontaveit's career-best form could see us witness a massive upset. The realists among us knew that it would never really be the case. Convincing from Venus!
That's all from me. I'll hand you over to Simon Sinclair to take you through the afternoon session.
Thanks Jonathan! Well, that was very simple for Venus, now we turn out attention to her sister and her clash against Madison Keys, which will highlight our afternoon coverage.
UPDATE! We still are awaiting news of whether Eugenie Bouchard will compete in her clash against Roberta Vinci this afternoon. The 21-year-old slipped in the locker room on Friday and struck her head, forcing her to withdraw from the doubles competitions on Saturday.
In case you missed our live coverage of Venus Williams's win over Anett Kontaveit, check out our recap here.
Back to Serena and her charge to join Steffi Graf to win 22 Grand Slams in the Open era. The 33-year-old has been in excellent form in the competition, but was forced to dig deep to defeat Bethanie Mattek-Sands after losing the first set. However, she showed the form of a true champion to battle back and secure her place in the last 16.
Serena faces a very tough task this evening against her compatriot Keys, who herself has been in outstanding form in the competition. The 20-year-old dispatched Agnieszka Radwanska in the third round in straight sets with relative ease and will be determined to reach the quarter-finals of her home slam for the first time in her career.
The two players have met just once before, which was earlier this year in the semi-finals of the Australian Open. Serena won the match in straight sets 7-6 6-2 on her way to winning the tournament. A victory today would see her play her sister Venus in the quarters.
Right, we're ready for the off, Serena to serve.
Keys shows aggression on the first point of the match by going for he baseline, but she narrowly misses to hand Serena the lead. A solid point follows for the 20-year-old as Serena sends her forehand wide of the mark, but the 21-time Grand Slam winner responds with an ace down the 'T'. Another good serve from Serena follows as Keys can only send her forehand into the net, and the 33-year-old sends down another ace to secure the opening game.
Keys wins the first point of the game with relative ease and then Serena is loose with her forehand towards the baseline, sending her strike out. The 20-year commits an error to give Williams a way into the game before the six-time champion delivers a backhand down the line to tie the scores at 30-30. However, Keys secures the hold as Williams puts her two forehands into the net.
An opening for Keys in the service game as Williams fires her forehand into the net, but she responds with a good serve down the 'T' which the 20-year-old can only guide into the net. She does it again to earn a game point, and the 33-year-old secures the hold when Keys goes long with her forehand when aiming for the baseline.
UPDATE! News on Eugenie Bouchard as the Canadian has cancelled her practice time and has not requested her racquets, which suggests that she may have to pull out of the competition.
Nice hold by Keys as she uses accuracy on her serve to push Williams back towards the baseline, forcing a couple of errors from the 33-year-old. She secures the game by using her power again and finishes with a cross-court winner on her forehand.
Serena starts the game with an ace down the 'T', but Keys responds with a well-worked point which ends with her firing a winner down the line. The 33-year-old finds her rhythm to win the next three points as power is the game name of the game to knock Keys back and allows Serena to pick her spot for three winners. Quality match so far.
Serena finds the net with a loose forehand and shows signs of disgust with herself for doing so. Keys responds in turn with slamming a backhand into the net without the dramatics afterward. Two further forehand errors follow from the world number one and she then goes long with her backhand on a second serve from Keys to hand her the game. Serena will not be happy with herself after that.
Perfect response from Serena to a sub-par game as she secures the first love-service game of the match. She dominated the court after nailing her serves across the 20-year-old, allowing her to claim the points with relative ease. Not much Keys could do there.
BREAK! Strong start to the game from Keys as she delivers an ace, but she then sends a backhand into the net to allow the 33-year-old into the game. Serena takes a huge risk by allowing a ball to fly over her head, but she judges the flight perfectly as it sails beyond the baseline. A double fault hands the six-time champion two break points and another error follows from the 20-year-old to hand her the game. She will now serve the set. Where did that come from?
SET! Good response from Keys to start the game as she fires a winner off her backhand across the court, but Williams responds with power to bring herself in control by firing two winners on her forehand. However, she misses a glorious chance to earn two set pointsby drilling the ball into the two from close range with the court at her mercy. A loose backhand from Keys does hand her a set point, and the 33-year-old delivers a peach of a serve down the 'T', which Keys can only send back into the net.
Nice serve from Keys as she nails it right on the line to level the scores after an early Williams point, and Serena then slams a forehand into the net to hand the 20-year-old a 30-15 lead. The 19th seed then delivers a perfect cross-court forehand to leave Serena rooted to the spot, but the six-time champion responds with back-to-back points to bring up deuce. A fine forehand winner hands Serena an early chance to break, but Keys repels her with a strike down the line. The 20-year-old rifles a series of forehands at the world number one before she finally yields to hand her advantage and Keys seals the game with an ace down the 'T'.
Serena begins with a sublime ace down the 'T' and Keys then powers a backhand into the net, but the 20-year-old gets into the game with Williams finds the net on her backhand. However, the 20-year-old then blasts her forehand beyond the baseline and Serena secures the hold with a strike down the line.
Keys takes the first point of the game but Serena's response is emphatic as she powers a backhand down the line to take a 15-30 lead. A short forehand from the 20-year-old leaves her open to a vicious strike from Williams to present the six-time champion with two break points. Keys does well to reduce it to one by sending her serve across the world number one to secure an ace, and her serve saves her again as Williams fails to control her backhand. Keys earns a game point, but Williams attacks her second serve with a bullet down the line to bring it back to deuce. A long backhand from the 20-year-old puts her in trouble, but she gets a slice of luck as Serena's backhand clips the net and bounces just out. Keys' serve continues to bail her out of problems as she earns a game point and then clinches a vital hold as Serena sends her forehand wide.
Keys cannot make an inroads on Serena's serve as she sends her strike into the net and is then on the receiving end of an ace. A long forehand from the world number one brings her into the game, but Serena brings up two game points with a measured cross-court forehand. Keys hits back with a winner of her own, but the 33-year-old secures the game with ease.
The 20-year-old holds with a love-service game, producing her best tennis of the match. Keys fires the ball hard at Serena and actually hits the court with her shots to secure the game and give herself a strong foothold in the match.
A loose forehand from Keys hands Serena the perfect start to the game, and the 20-year-old then sends her backhand beyond the baseline. A rally builds, but is swiftly ended when the 19th seed sends her backhand into the mesh once more. Keys continues to put it all out there with all or nothing shots and she finds the line with her forehand and then delivers a sublime backhand down the line to bring herself into the game. However, her resistance ends when she sends another backhand beyond the baseline.
UPDATE! Eugenie Bouchard has withdrawn from the women's singles due to her head injury, handing a walkover to Roberta Vinci.
UPDATE: Eugenie #Bouchard has withdrawn from women's singles competition due to a concussion. #Vinci into the QFs. pic.twitter.com/NWRDXO0Ded
— US Open Tennis (@usopen) September 6, 2015
BREAK! Keys starts the game with a loose backhand, but rallies with excellent tennis to take the game to Serena, firing several fine shots on her hand past the world number one. However, a double fault brings Serena back into the game and she makes Keys pay with a forehand winner down the line. Keys screams in frustration as she sends another forehand beyond the baseline to hand the world number one a break point, and she seizes the initiative to take it by firing her backhand low at the feet of Keys, forcing the error.
Keys's problems with unforced errors continue as she sends her backhand beyond the baseline and a forehand winner from Williams puts her in control of the game. The 20-year-old tries to force the issue, but sends her backhand wide this time, but she finally finds her range with a backhand down the line. However Williams seals the game with a 121mph ace down the 'T'.
GAME, SET, MATCH! A good start to the game for Keys as she fires a winner down the line and then benefits from an error from Serena, but she makes a costly error on her backhand by sending it inches long, bringing the world number one into the game. The 33-year-old benefits from a slice of luck as her backhand clips the top of the net and bounces over, leaving Keys in a heap on the floor. Williams secures the win when Keys double faults for the sixth time in the match.
Serena advances to the quarter-finals of the competition without breaking a sweat this evening. The 33-year-old will now face off against her sister for a place in the last four on Tuesday.
More on the story that Eugenie Bouchard has been forced to withdraw from the US Open due to a concussion here.
UPDATE! Jamie Murray and John Peers are a break up in the first set of their doubles clash against Philipp Oswald and Adil Shamasdin in the third round of the men's doubles.
UPDATE! Feliciano Lopez is up by one set in his round-four clasha against Fabio Fognini, but the Italian has just broken the Spaniard's serve in the second.
Venus Williams has revealed that she and her sister Serena "inspire each other" to success after the duo booked their places in the quarter-finals of the US Open, where they will face off for the 27th time. For more read here.
UPDATE! The clash between Fognini and Lopez has gone to a tie-breaker in the scond set after the Spaniard was able to break back. An important moment for the Italian in the game.
RESULT! Jamie Murray and John Peers have secured their place in the quarter-finals of the men's doubles courtesy of a straight-sets win over Philipp Oswald and Adil Shamasdin.
UPDATE! Feliciano Lopez has won the second set against Fabio Fognini to take a two-set lead. The Italian will now have to perform the heroics which saw him beat Rafael Nadal in the last round by coming from two sets down.
Check out the full result article of Jamie Murray and John Peers's victory in the men's doubles here.
RESULT! Feliciano Lopez has defeated Fabio Fognini in straight sets 6-3 7-6 6-1 to advance to the quarter-finals of the US Open, where he will face either Novak Djokovic or Roberto Bautista Agut.
Here is our recap of Lopez's triumph over Fognini in the last 16 of the competition.
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We're under 20 minutes away from seeing world number one Novak Djokovic on court in his clash against Roberto Bautista Agut. The two players have only played each other twice before today, with the Serb coming out on top in both meetings in Dubai.
Djokovic has been in prime form during the tournament so far and has not dropped a set in his victories over Joao Souza, Andreas Haider-Maurer and Andreas Seppi. Meanwhile, the Spaniard benefitted from the retirement of David Goffin in his last match as the Belgian held a 2-1 lead in the match, but was unable to continue due to the heat.
Before the Djokovic match starts, we'll have a recap of all the results we've had today:
Defending champion Marin Cilic defeated Jeremy Chardy in four sets. Read more.
Jo-Wilfried Tsonga advanced to the last eight at the expense of his compatriot Benoit Paire. Read more.
Two-time US Open champion Venus Williams eased past Anett Kontaveit into the quarters. Read more.
Serena Williams battled past her fellow American Madison Keys to set up the last-eight showdown against her sister. Read more.
Roberta Vinci was handed a walkover into the last eight of the competition after Eugenie Bouchard was forced to withdraw as a result of concussion. Read more.
Feliciano Lopez defeated Fabio Fognini in straight sets to advance to the last eight. Read more.
That's it from this evening. I'll hand you over to Callum Mulvilhill who will take you through the match between Djokovic and Bautista Agut.
Thanks Simon! As my colleague mentioned, Djokovic has been pretty much perfect since the start of the tournament but will it be another routine win for the world number one? Bautista Agut is certainly a dangerous opponent. He'll need a special performance tonight.
Tonight, #Djokovic takes on Bautista-Agut for a place in the QFs. The World No. 1 has never lost a set in the H2H. pic.twitter.com/W8o9LPe0z1
— US Open Tennis (@usopen) September 6, 2015
Perhaps the biggest surprise is that Djokvic has won just one title in New York, with that victory coming back in 2011. It seems a safe bet to assume that the Serbian has more title in his locker, and at just 28, there is still so much to come from the top seed.
Bautista Agut can be tricky to pick up in longer rallies with his flat approach, and the Spaniard is sure to fly out quickly in an attempt to produce a shock. The 23rd seed really does need to take the opener. If Djokovic is comfortable early on, he will be difficult to stop.
Bautista Agut is in the fourth round of the US Open for the second year in a row. The 27-year-old has never played in a Grand Slam quarter-final. Djokovic is bidding for a last-eight spot at Flushing Meadows for the ninth year in a row.
Here we go then. Djokovic to serve first.
Nice, confident start from Djokovic as he goes from side to side before stepping in to deliver a forehand. A wild backhand is quickly forgotten when Djokovic dominates a longer rally from the back of the court to take a 30-15 lead when Bautista Agut finds the net on the stretch. Another step forward sets up a powerful forehand, and despite a good response from Bautista Agut, Djokovic puts away the volley. The world number one is then left helpless at the net as he fails to get racket on a perfect lob. A big first serve clinches the hold.
Bautista Agut begins his first service game with an ace down the middle, before being pegged back when Djokovic pushes him wide and finds the opposite corner with the backhand. A couple of mistakes from the back of the court move Bautista Agut head comfortably and he holds with a quicker serve out wide.
Wow! First gasp of excitement from the crowd as Bautista Agut responds to being pushed out wide by finding the line with an unstoppable forehand. Djokovic does some excellent chasing to defend at the back and catch a drop shot, leaving his Spanish opponent to push a half-volley wide. As you would expect, Bautista Agut is keen to mix things up whenever he can. You feel he must do that to surprise Djokovic, who pulls out of 30-30 with an ace and holds once again.
Bautista Agut's weak second serve allows Djokovic to take charge and win the first point with a forehand winner, before an opportunity is created for the world number one when the Spaniard double faults. The 23rd seed pulls one back, but he's beaten by an excellent forehand while going in the opposite direction. Break point number one is saved by an ace after an unsuccessful challenge from Djokovic and Bautista-Agut then follows a serve down the middle with a forehand winner. A miscued stroke into the net creates another chance for Djokovic, who produces some brilliant defence in an extended rally but is beaten by a flick off the top of the net. Another shot into the net brings break point four but Djokovic misses again when failing to send back a forehand on the run. A serve out wide gets Bautista Agut to advantage for the first time and he finally escapes with a hold. Great resilience.
The world number one is starting to find rhythm on serve and he is capitalising on any short balls with that trademark movement all over the court. A couple of mistakes leaves the game a 30-30, but Djokovic delivers with two big serves to take the game.
Good tennis from Bautista Agut a the serve and approach shot allows him to put away the overhead smash. Djokovic seems to be a surprised by a higher bounce off the line in the next exchange and finds the net, but he challenges to prove that the ball had drifted out. A couple of mistakes from the baseline hand the control to Bautista Agut, who misses with passing backhand but wins the game by chasing down a drop short to force his rival to go long on the stretch.
Djokovic successfully challenges for the second time at 15-15 to replay the point, but he misses the mark with a good opportunity on the backhand side. A clever second serve fools Bautista Agut, who fails with an attacking response when the ball kicks on quickly. Bautista Agut then produced a quite superb run of shots before setting up break point with a fantastic forehand winner. Djokovic saves himself with an ace and another one moves him ahead. A third serve, this time down the middle, is unreturned. Good signs for Bautista Agut, but he needs to maintain this form.
BREAK! Bautista Agut takes the first point, but the second serve is certainly an area to target for Djokovic, who takes control of the point and leaves his rival no chance when he opens the body to deliver the forehand. An unforced error from the Spaniard opens the door slightly and Djokovic defends well on the run before putting away the pass after Bautista Agut comes to the net. Two break points. Superb! Both men appear to win the point with drop shots, but Djokovic catches the final ball to go cross court to beat the Spaniard. He will now serve for the set.
SET!Bautista Agut continues to battle impressively as he follows the powerful forehand with a good drop shot after Djokovic was forced back, but an unreturned first serve gets the game to 30-30. The Spaniard bosses the next rally and Djokovic goes long to hand the Spaniard a break point. Bautista Agut challenges successfully after Djokovic appears to serve an ace, but the break point is still saved when the 23rd seed hammers a forehand into the net. Fantastic tennis from both men in one of the longest rallies so far, and it's set point that arrives when Bautista Agut's forehand drifts a few inches wide. Djokovic capitalises by catching the lob with an overhead smash to take the crucial opening set.
Bautista Agut played good tennis throughout the opener, but Djokovic did what he always does best to turn an opening into a vital lead. It will be difficult for Bautista Agut from here. The 23rd seed must start the second set well.
Just what the doctor ordered for Bautista Agut, who includes an ace in a comfortable hold to 15 at the start of the second set.
Great tennis from Djokovic. He starts the game with a couple of aces and breezes to a routine hold to love to put the pressure back on Bautista Agut, who has just attacked too early on a couple of occasions.
BREAK! Chance for Djokovic as he gets to 0-30 with a brilliant backhand volley after moving Bautista Agut from side to side with a couple of powerful strokes. Bautista Agut takes the next point and then appears to have full control on a rally, but Djokovic's defence from beyond the baseline is perfect and his ability to force one more shot sees the Spaniard find the net. A venture to the net then ends in a failure when Djokovic's fine backhand means Bautista Agut can only find the with a difficult volley. The Serbian is in a great position now.
Djokovic looks in great touch as he moves forward and gets around the ball to deliver another winner on the forehand side, before watching an attempted pass from his rival fly wide. The decision to let a ball bounce at the net almost comes back to haunt the top seed, but he readjusts to put away the next volley. It's another comfortable hold to 15 for Djokovic, who does not appear to be in the mood to offer up any more opportunities on serve.
Bautista Agut has probably played a few too many risks with drop shots and moves to the net at the wrong times, but he is aware of the need to surprise Djokovic. The Spaniard sticks with power from the back of the court this time as he breezes through a hold to build confidence.
Djokovic is not happy with himself when he finds the net with a miscued slice early in the game, but Bautista Agut then fails to execute a drop to make it 30-15. It looks like another comfortable game until Bautista Agut gets back to deuce with a great forehand winner following a short approach from the world number one. Djokovic finishes a below-par game brilliantly by sending his opponent wide before bringing out the drop volley. A huge cheer follows as the Serbian looks to retain the control.
Djokovic has a chance with plenty of the court to aim at, but a backhand drifts wide of the line. A big mistake from Bautista Agut sends the ball long off a routine baseline backhand, before Djokovic dominates the next rally to bring up a couple of break points with a simple push volley at the net. Bautista Agut hits back with a big serve and well-placed forehand to save one and he is back to deuce when a Djokovic backhand is halted by the net. The Spaniard fails to convert advantage, but gets back there when Djokovic fires a forehand beyond the baseline. Deuce number three arrives after a backhand at the net. However, Bautista Agut finally escapes with the hold. Opportunity missed, but Djokovic is still in charge.
BREAK! After a seven-minute hold for Bautista Agut, the Spaniard is gifted the first point when Djokovic comes up short with a drop shot and the world number one makes another mistake with a backhand that drifts long. At 30-30, there is a hint of an opportunity for Bautista Agut but an ace hands the control to Djokovic, who is then left helpless as he comes to the net to execute a drop before watching his opponent chase down the ball and complete the winner on the slide. There's no stopping the next drop shot from Djokovic. Perfect. After missing two chances to take the game, Djokovic hands Bautista Agut a break when he fails to clear the net after advancing from the baseline. Breakthrough! Excellent response as he punishes an off-balance Djokovic with a backhand winner to get back level in the second set.
We may still have a match on our hands tonight. Bautista Agut is wining support from the New York crowd with some excellent tennis as he unleashes a brilliant forehand winner on the way to a 40-0 lead. Djokovic refuses to give up on the game and he gets back to 40-30 by chasing down a volley to lob the Spaniard. A second serve allows him to attack, but Bautista Agut produces another fantastic forehand to take the game. Suddenly, the pressure is on the world number one.
SET! The momentum has certainly shifted, but Bautista Agut needs to turn a good spell into success in the second set. Djokovic's backhand appears to have deserted him since taking the lead as he finds the net halfway up. At 15-30, the pressure is on but Djokovic responds with an unreturnable first serve out wide. Some positive offense from Bautista Agut allows him to take charge of the next rally and Djokovic fires into the net to hand his opponent set point. Superb! A gripping exchange from the back of the court swings one way and then the other, before Djokovic crashes against the net with a forehand. What a response from Bautista Agut to get back level.
Djokovic loses a set for the first time at this year's US Open, and he certainly has not looked the same since taking the lead in the opener. Some uncharacteristic mistakes have opened the door to Bautista Agut, who is fighting hard and causing problems with his flat shots.
Djokovic is desperate to attack the second serve, but he is wide with the backhand as Bautista Agut takes full control and a similar attempt finds the net to hand the game to the Spaniard.
You don't see this much in Djokovic matches. Everything is coming off for Bautista Agut, who produces a reaction from the crowd with a stunning cross-court forehand winner. The cheers just get louder when the Spaniard steps in from the baseline to deliver another winner with the world number one helpless on the other side of the court. A second serve kicked out wide allows Djokovic to pull a point back and he wrestles control of the next point to force Bautista Agut to find the net while running to the forehand. Tough times for the world number one, but he battles to a hold of serve after a double fault and two errors bring Bautista Agut to deuce three times.
Chance for Djokovic when he wisely calls for a challenge after Bautista Agut drifts a couple of inches beyond the baseline. Another challenge follows when Djokovic unleashes a powerful backhand, but the technology proves he missed the line. Djokovic does well to stop one forehand, but he can only watch and admire when Bautista Agut finishes another rally with a winner. The confidence is flowing a Bautista Agut battles from 0-30 to take the game with an emphatic drive volley.
Bautista Agut is just not backing down! He is going shot for shot with the 2011 winner and a quite simple approach seems to be paying off after he attempted to mix his game up earlier on. On second serve at 30-30, Bautista Agut fancies his chances with the running forehand, but he is pushed very wide and sends his effort long. A desperate challenge follows when Djokovic beats his rival with a brilliant forehand winner. The first break in this set will be huge.
BREAK! Better from Djokovic as he delivers his return into a difficult spot in the opening point, and he uses the court well to move to 15-30. Chance for the world number one. Bautista Agut is challenging again but he's an inch too long and Djokovic gets a couple of break points. Can he capitalise? You bet he can. The first opportunity is missed, but the Serbian punishes a second serve to take control of a rally and make the breakthrough when his rival goes long once again. Is that the turning point?
Mistakes from Bautista Agut now as Djokovic responds to his breakthrough by holding to 15, despite missing a fairly routine volley after a fine approach shot out wide.
Bautista Agut delivers a couple of very good serves at the body, but the brilliance of Djokovic allows him to return well and beat the advancing Spaniard with the perfect passing stroke. The 23rd seed gets back to 30-30, before an extended spell of baseline strokes ends with Djokovic finding the net with a miscued forehand. Another miscue follows, and this time the ball drifts beyond the baseline. Important hold from Bautista Agut.
Much, much better from Djokovic. The serve is clicking now and Bautista Agut's shots are starting to land the other side of the line. He quickly holds to love.
The second serve is poor from Bautista Agut, who then finds the net with a lazy backhand. Djokovic does well to get the volley back over the net, but Bautista Agut recovers well to come forward and send his opponent the wrong way with the pass. The world number one can only applaud when Bautista Agut pushes him wider and wide, before unleashing an excellent forehand winner down the line. A wayward backhand from the Spaniard makes it 30-30 and set point looks certain to arrive after some powerful forehands, but Djokovic gets in an awkward position and sends a half volley wide. The Serbian hits back with an excellent return of serve, followed by a forehand which Bautista Agut can only send back to the net. Bautista Agut responds with a big first serve out wide and he extends the set with a similar effort.
SET! A defiant Bautista Agut gets to 15-15 with a superb forehand when Djokovic starts the journey to the net, but the world number one's fine serving keeps him in control. He sends Bautista-Agut out wide with another big first serve and the Spaniard can only return it long. Djokovic leads 2-1. What else does Bautista Agut have?
BREAK! A change of shirt for both men between sets, but Bautista Agut needs a change of fortune now as two unforced errors put him in immediate trouble. Djokovic capitalises on a second serve and Bautista Agut sends a forehand wide for the second time to bring up three break points. The Serbian needs just one as Bautista Agut misses again, this time with the backhand, to lose his serve. This could be over quickly from here.
Better from Bautista Agut as he gives himself an opportunity by staying in the point for longer, which brings the mistake from Djokovic early in the game. It's a hold, though, as Djokovic encourages applause by wrong-footing his rival with an excellent forehand. Bautista Agut's drive volley in a losing effort should be a confidence booster, but he needs something special now.
Credit to Bautista Agut. It looked like Djokovic may have raced clear, but his eagerness to attack the serve is his undoing as Bautista Agut holds to love.
BREAK! Poor from Djokovic early in the game as his approach sets up Bautista Agut for the powerful forehand down the line. A bit of pressure builds when Bautista Agut sends a forehand one way before going the other direction with the winner to make it 15-30. Excellent from Bautista Agut as he reads every baseline stroke to extend the rally and Djokovic finds the net to gift his opponent a couple of break points. The big first serve down the middle is followed by a powerful forehand as he saves one. Superb! Djokovic looks to use the same combination but Bautista Agut digs himself out of trouble with a forehand on the run before passing the world number one, who is left shaking his head at the net.
BREAK! Djokovic continues to go to the Bautista Agut on far too many occasions. The Spaniard is happy with that tactic as he gives the best player in the world no chance with another huge swing of the racket. Djokovic battles to 30-30, but Bautista Agut displays his confidence with a positive move to the net which results in an easy smash. However, a big mistake from Bautista Agut with the forehand brings the game to deuce. An opportunity arrives when Djokovic forces Bautista Agut into an awkward half volley, before clipping the line with the cross-court forehand. Incredible tennis! Djokovic is in no mood to miss the opportunity as he comes to the net to clinch the break with a quite superb drop volley. He hasn't shown too much emotion, but the big fist pump is out now.
It's the Djokovic forehand doing the damage now as he dominates the opening rally before going down the line with a winner to reach 30-0. Bautista-Agut is unable to get on the board as Djokovic cruises to a comfortable hold of serve.
BREAK! Djokovic has found another gear. Bautista Agut does well just to get to a powerful forehand down the line, but he barely makes a move when the Serbian executes the perfect drop shot. A tiring Bautista Agut loses the next point, too, before offering his rival three break points with a weak backhand into the net when Djokovic takes control. Emphatic. There is no other word for it. Djokovic returns with a winner to complete a break to love. He will serve for the match.
BREAK! The Bautista Agut challenge refuses to die! It is not comfortable for the world number one as Djokovic shakes off the loss of the first two points to get level, before offering up a break point with a double fault. An unreturned first serve gets him to deuce, but a second break point arrives when Bautista Agut clips the line with an all or nothing forehand. Djokovic attempts another drop shot and he comes up short to hand his opponent a glimmer of hope. He remains a break ahead.
GAME, SET AND MATCH! A show of appreciation from Djokovic when he watches Bautista Agut beat him with a lovely half volley. Djokovic is next to come to the net, but a poor volley is punished with a passing winner. The world number one then attacks the second serve to go down the line with the forehand, and the drama keeps coming as a double fault makes it 30-30. Match point arrives when Bautista Agut misses the line with a cross-court forehand. Djokovic just needs the one. A powerful forehand sends Bautista Agut wide and the Spanish can only go long on the stretch. The top seed survives a tough challenge on Arthur Ashe.
It was certainly not a classic Djokovic display. Sluggish at times, the world number one relied on a few moments of class to come through at key times. Bautista Agut responded to the early setback impressively and may have forced a fifth on another night. It seemed that he tired in the fourth and Djokovic capitalised to book his quarter-final spot.
Djokovic is all smiles as he salutes the New York crowd. You would expect him to improve after this match. He'll certainly be happy with the win, but the Serbian will be keen to start producing his best as the challenges get tougher. Feliciano Lopez will be his opponent in the last eight.
Novak Djokovic survives a scare v. Roberto Bautista Agut to win in four sets and advance to his 26th straight GS QF. pic.twitter.com/l9L20AbshE
— Live Tennis (@livetennis) September 7, 2015
You can now read a full report of Djokovic's triumph over Bautista Agut. Will the world number one improve enough to claim his second US Open title?
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Just one final match remaining on day seven of the US Open as 13th seed Ekaterina Makarova takes on Kristina Mladenovic for a spot in the quarter-finals. I'll keep you updated with the action from that fourth-round clash.
Kevin Anderson meets Andy Murray in the fourth round on Monday - a match you can follows with us - and the South African has been speaking about how special a quarter-final place would mean to him.
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One story is dominating the headlines at the US Open, and that is the quest for a sweep of all four Grand Slams from Serena Williams, who beat Madison Keys earlier in the day. The American, however, has insisted that victory in the tournament will not "make or break" her.
Djokovic reaches 9th straight USO QF and 26th overall in a Grand Slam tournament, which is 3rd most in the Open Era (Federer 36, Connors 27)
— Carole Bouchard (@carole_bouchard) September 7, 2015
Makarova is already up a break against Mladenovic, but with both women struggling on serve, it is probably safe to expect quite a few twists in the final match of the day.
Madison Keys was unable to cause an upset in her fourth-round clash with Serena Williams, and she has admitted that the world number one's weapons forced her to adopt a slightly different approach.
Fabio Fognini produced one of the most memorable comebacks ever to beat Rafael Nadal in the third round, but he was beaten 6-3 7-6 6-1 by Feliciano Lopez today and the Italian admits that fatigue was an issue.
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SET! After twice leading by a break in the opening set, Ekaterina Makarova has fallen behind to Kristina Mladenovic. The unseeded Mladenovic wasted three set points earlier on, but the French ace won the tie-break 7-2 to take the lead.
Johanna Konta has led the British challenge in the women's draw with three impressive performances at Flushing Meadows, but ahead of her fourth-round clash with fifth seed Petra Kvitova, she has insisted that her mindset has not changed.
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SET! After nine successive games without a break, Makarova has just broken Mladenovic to love to take the second set 6-4. An exciting match is headed for a decider!
Only Roger Federer and Jimmy Connors have reached more successive Grand Slam quarter-finals in the open era than Djokovic, who booked a last-eight spot for the 26th time in a row at the four major tournaments. As you can imagine, the Serbian is delighted with his record.
RESULT! Day seven comes to an end with an upset! Mladenovic produces a stunning display in the decider to beat Makarova 7-6 4-6 6-1 to reach a Grand Slam quarter-final for the first time in her career. She will take on Roberta Vinci next.
That's all from our live blog, but make sure you're with Sports Mole from 4pm (BST) for day eight of the US Open.
