Sinner, Swiatek tested at US Open as Gauff sets up Osaka showdown

New York: Jannik Sinner kept his US Open title defence on track Saturday as Iga Swiatek struggled through to the last 16 and home favourite Coco Gauff...

New York: Jannik Sinner kept his US Open title defence on track Saturday as Iga Swiatek struggled through to the last 16 and home favourite Coco Gauff booked a blockbuster clash with Naomi Osaka.

Sinner rallied from a set down to beat Canadian 27th seed Denis 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.

"I was in a very difficult moment," said Sinner. "The scoreline was a bit against me today, but I just tried to stay there mentally."

World number one Sinner will face Alexander Bublik next after the mercurial Kazakh put out US 14th seed Tommy Paul in a late-night thriller, winning in five sets.

"Week two is completely different. It's getting tougher and tougher," said Sinner.