World number one Novak Djokovic remains on course for the calendar-year Grand Slam after a comprehensive second round 6-2, 6-3, 6-2 victory at the US Open over Talon Griekspoor on Arthur Ashe Stadium.

Djokovic fired 33 winners, hit 13 aces and broke the Dutchman six times en route to his 23rd consecutive match victory at a major this year. He faces Kei Nishikori for the 20th time in the third round.

Top seed sweeps past Griekspoor, into third round

Griekspoor was taken to deuce in his first service game, but he managed to hold on. The Dutchman wasn't as fortunate next time he served, dumping a forehand into the net on break point.

Leading 3-1, Djokovic dominated on serve, losing just four points in his four service games. The world number one broke to win the set after some excellent defense led to a deft backhand volley winner.

The second set began much like the first with Djokovic claiming the early advantage after Griekspoor netted a backhand, giving the top seed a 2-0 lead.

Surprisingly, the Serb was broken back, but he rebounded immediately when the Dutchman committed another error to make it 5-3 in favor of Djokovic. He served out the easily and assumed a two-set lead.

Djokovic won his 23rd consecutive major match and looks on course to complete the calendar-year Grand Slam/Photo: Matthew Stockman/Getty Images

Griekspoor was able to keep pace with the 20-time major champion through the first four games, but Djokovic closed fast, breaking to love after Griekspoor missed from the ground yet again and after saving three break points, he went up a double break.

Serving for the match at 5-2, the world number one was pushed to 30-30, but an unreturned serve brought up match point and an ace closed out another superb performance.