Novak Djokovic has conceded that he was left "frustrated" during the second set of his 6-0 5-7 6-1 win over Martin Klizan at the Miami Masters earlier today.
It appeared that the world number one was heading for a swift victory when he claimed the opening set in just 23 minutes, but his Slovakian opponent was able to take the encounter into an unexpected third set.
Speaking afterwards, Djokovic told reporters: "Credit to Martin for battling and making me play the extra shot. It was a pretty different game in the second set than it was in the first.
"I was frustrated, no doubt about that, and every athlete goes through ups and downs and various emotions during the matches like this. It's important always to regroup and maintain that self‑belief and composure."
Djokovic will now face Belgium's Steve Darcis in the third round of the competition.
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