US Open

Serena Williams passes Madison Keys test in last 16

Published: September 6 2015 | 21:45

Last updated: September 6 2015 | 23:31

Serena Williams beats Madison Keys to set up a US Open quarter-final with sister Venus Williams.

Serena Williams will face sister Venus Williams in the quarter-finals of the US Open after beating Madison Keys in straight sets.

Keys looked to be holding her own as the first set remained on serve for the opening seven games.

Serena Williams of the United States returns a shot to Madison Keys of the United States during their Women's Singles Fourth Round match on Day Seven of the 2015 US Open © Getty Images

The youngster started the eighth game with an ace, but an unforced error and successive double faults gifted Williams a 5-3 lead.

Despite Keys forcing 30-30 and the possibility of a break back, the world number one was able to see out the first set.

Serena Williams of the United States celebrates after defeating Madison Keys of the United States during their Women's Singles Fourth Round match on Day Seven of the 2015 US Open © Getty Images

The 20-year-old faced an early break point in the second set, but showed resolve to hold as her powerful groundstrokes allowed her to stay in touch with the top seed.

However, a break in the seventh game gave Williams a sniff of victory and the 33-year-old broke again to seal her progress into the last eight with a 6-3 6-3 win.