Novak Djokovic comfortably through to second round

Novak Djokovic is through to the second round of the US Open after a convincing straight-sets win over Diego Schwartzman at Flushing Meadows in New York.

The world number one eased to victory over the 22-year-old 6-1 6-2 6-4 in one hour and 37 minutes as he ruthlessly put Schwartzman, who was playing in his first tour-level hard court match, to the sword.

"It's never easy to start a US Open smoothly," Djokovic told reporters after the match. "I'm sure I'll be fresh and motivated to play [in the second round]."

The top-seed will face France's Paul-Henri Mathieu in the next round.