World No. 1 Novak Djokovic cruised to the fourth round after a three-set victory against Sam Querrey, 6-3, 6-2, 6-2 at the U.S. Open in Flushing Meadows on Saturday.

The 27-year-old Serb needed only an hour and 30 minutes to dispose of the American Querrey at the Arthur Ashe Stadium in New York.

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Djokovic admitted that he was not emotionally in the previous tournaments at Toronto and Cincinnati, and felt that the early exit in Cincinnati gave him more time to prepare for the last Grand Slam event of the year.

"This is where I want to play my best tennis," Djokovic said. "I haven't done as well as I wanted in leadup tournaments, Toronto and Cincinnati."

"It's peaking at the right time, the right tournament," Djokovic added.

The seven-time Grand Slam champion will next face Phillipp Kohlschreiber, who upset 13th-seed American John Isner, 7(7)-6(4), 4-6, 7(7)-6(2), 7(7)-6(4).

Despite the furious serves of Isner, delivering 42 aces, the German was able to take advantage of second serves by coming into the net and converting 73 percent of attacks.

Kohlschreiber have defeated in Isner for a third year in a row, all in the same third round against Isner, he hopes make a quarter-finals appearance at the U.S. Open for the first time in his career.

Milos Raonic had a more difficult time in his matchup against Victor Estrella Burgos, outlasting him in three tie-breaking sets, 7(7)-6(5),7(7)-6(5), 7(7)-6(3).

It seems that the Canadian is more successful in dealing with tie-breakers.

"It is a coin toss in a lot of ways," Raonic said. "It can go both ways, but with my serve and ability to finish points quickly and the kind of pressure that puts on my opponents."

Indeed Raonic has a powerful serve, converted 22 aces in the match, and delivered 31 out of 51 net points.

The fifth-seeded Raonic is set to face Kei Nishikori of Japan who is coached by 1989 French Open champion Michael Chang.

TagsNovak Djokovic, Sam Querrey, John Isner, Phillipp Kohlschreiber, Milos Raonic, Kei Nishikori, Michael Chang