Reigning men's champion Jannik Sinner charged into the third round of the US Open on Thursday as Coco Gauff and Iga Swiatek battled to keep their title bids intact.

Sinner swatted Australia's Alexei Popyrin aside 6-3, 6-2, 6-2 to stretch his Grand Slam winning streak on hard courts to 23 matches.

The Italian top seed has made a convincing start in his bid to become the first man to repeat as US Open champion since Roger Federer won five in a row from 2004-2008.

"I'm very happy that I managed these matches as good as I could," said Sinner, who dropped only four games in his opening win before blasting past the 36th-ranked Popyrin.

"I am aiming to improve on the serve but the rest (of my game) I am quite comfortable with."

Sinner faces Canadian 27th seed Denis Shapovalov in the third ro

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