Novak Djokovic may not firing on all cylinders but the former world number one is safely through to the third round of the French Open.

Novak Djokovic dropped just four games against Paul-Henri Mathieu as he coasted into the third round of the US Open. The world number one, bidding to reach the final for a fifth straight year, had the easiest of afternoons on Arthur Ashe, defeating the 81st-ranked Frenchman 6-1 6-3 6-0.