World number one Jannik Sinner demolished big-serving Alexander Bublik to storm into the US Open quarter-finals on Monday.

Defending champion Sinner needed just 81 minutes to administer a brutal 6-1, 6-1, 6-1 drubbing to reach the last eight.

Bublik smiled as he embraced Sinner at the net after the defeat, and could be heard telling the Italian: “You’re so good, this is insane.”

Sinner meanwhile said Bublik’s performance might have been impacted by his marathon five-set victory in the previous round.

“He had a very tough match the last match, today he didn’t serve as well as he usually serves, and I broke him early,” said Sinner. “Overall, I’m very happy.”

Kazakh 23rd seed Bublik had advanced to Monday’s last 16 clash without dropping a single service game in his three previous rounds

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