Novak Djokovic is through to the second round at the US Open.
He dropped just five games in a straight sets win over Alexandre Muller at Flushing Meadows.
The result means Djokovic will return to world number one, ahead of Carlos Alcaraz.
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The Serb believes he still has plenty of room for improvement.
In the women's draw, home favourite Coco Gauff is safely through after a win in three sets over Laura Siegemund.
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And former world number one Caroline Wozniacki made a winning return with a straight sets victory against Tatiana Prozorova.
