New York - Top-seeded Novak Djokovic moved into the fourth round of the US Open by beating 95th-ranked Joao Sousa of Portugal 6-0, 6-2, 6-2 on Sunday night.
Djokovic's serve was broken only once, when he served for the match at 5-1 in the third set. He's been broken once in each match while winning all nine sets he's played so far.
His six career Grand Slam titles include the 2011 US Open and he has reached at least the semifinals at Flushing Meadows each of the past six years. Djokovic lost in last year's final to Andy Murray.