it wasn't plain sailing for Novak jokovic despite his latest win overnight. it wasn't plain sailing for Novak jokovic despite his latest win overnight. Novak jokovic has opened up on the problems he endured with his serve despite winning through to the third round of the US Open the Serbian was leading llo djer 64 6420 when an abdominal issue meant his compatriot djer was unable to continue it was a record win for the 37-year-old as he became the first player in history to win 90 matches in each of the four grand slams but it was far from straightforward with jokovic throwing down eight double faults during the clash with his first serve percentage down at just 47% pressed on the issue in his postmatch press conference jokovic admitted I haven't been serving well in the first two matches here so I'm still trying to find that Rhythm and Tempo if you don't have a good percentage of first serves and you have to work for your points particularly against a player like djr I knew coming into the match that if I don't serve well which was the case then I'm going to have to really grind and work for my points a lot and that's what I guess caus the two sets to be played over two hours prior to coming off Court jokovic had also opened up on his service struggles to Nick kio's paying his friend to compliment in the process it should have been his second set honestly he was 4-2 up said the Third