I am not a machine, I can struggle from time to time," says Sinner after being tested by Shapovalov

Pushed to the limit by Denis Shapovalov at the US Open, Jannik Sinner had to battle for over three hours on Arthur Ashe Court to come out on top.

In the round of 16, the Italian and world No. 1 acknowledged that he had been challenged by the Canadian, while still being satisfied with his performance:

"You know, I am not a machine (smile). I can struggle from time to time. Today, I didn't feel any difficulties on my side. I was playing very good tennis, and so was he, so it was a match. Denis is an incredible player, he has shown it many times. This year, he has won two titles.

He is in form, and I think we all saw that today. He was serving well, returning well, so anything can happen. It was a very good match from both sides, and there were many twists and turns. The score wasn't always in my favor today, but I stayed focused.