US Open - Djokovic roars into U.S. Open fourth round

The 26-year-old Serb, who has yet to lose a set, smacked 34 winners to just 10 for the 95th-ranked Sousa in the 100-minute rout.

Australian Open champion Djokovic faced just two service breaks, while converting eight of 13 against his opponent.

Djokovic, a 2011 winner at Flushing Meadows who fell to Andy Murray in five sets in last year's final, next faces 43rd-ranked Marcel Granollers of Spain after he beat 109th-ranked American wild card Tim Smyczek.

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