Jannik Sinner kept his US Open title defence on track with a battling four-set win over Denis Shapovalov on Saturday as home favourite Coco Gauff sailed into the women's last 16.

Sinner rallied from a set down to beat Shapovalov 5-7, 6-4, 6-3, 6-3 and is trying to become the first man to retain the title in New York since Roger Federer in 2008.

"A very tough match today. I've known Denis for quite a long time. I knew that I had to play at a very high level," said Sinner, who lost his previous meeting with Shapovalov at the 2021 Australian Open.

World number one Sinner awaits the winner of the evening session match between US 14th seed Tommy Paul and Alexander Bublik, the 23rd seed from Kazakhstan.

"Week two is completely different. It's always a great sight that I'm still here. It's ge

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