Jannik Sinner has admitted he 'didn't know what to say' during a meet and greet with Princess Kate, Princess Charlotte and Prince George after they watched his Wimbledon victory from the Royal Box.

Sinner signed tennis balls for Princess Charlotte and Prince George, as well as an extra one for Prince Louis, who did not attend.

Afterwards, the Italian said: "In the beginning I didn’t know what to say, because in those moments, you don’t want to—it's difficult to understand, you know, how you can talk.

"I always try to talk very naturally, you know. I asked the kids if they play tennis and asked what kind of racquets they play with—these kinds of things. But it was amazing."