NEW YORK :Defending champion Jannik Sinner overcame stiff resistance to power into the U.S. Open fourth round with a 5-7 6-4 6-3 6-3 win over 27th seed Denis Shapovalov on Saturday that extended his unbeaten run at hardcourt Grand Slams to 24 matches.

The 24-year-old Italian has not lost on his dominant surface at the majors since 2023, capturing two Australian Open titles as well as last year's trophy at Flushing Meadows

There was a hint of concern from Sinner's team when he made a double fault to go 0-30 down at 2-5 in the first set, but the world number one held serve and raised his fist to loud roars after hitting a spectacular lob en route to breaking back.

A rattled Shapovalov remonstrated with the chair umpire during the changeover, protesting an automated foot fault, but compose

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