The Duke and Duchess of Cambridge's eldest child received a private session from the 37-year-old Swiss champion, who is his "favourite player" at the moment, after his match at Wimbledon on Thursday.
According to HELLO!, Federer - who has four children of his own - said of the five-year-old royal's skills: "At that stage it's all about just touch the ball, it's already good. "Same with my boys. I think I have a little advantage that I actually spent some time, you know, with him. I'm the only player he's ever met. Then you have a little head start in who is your favourite player."He added: "I love to see that they're into tennis or into sports ... his mum has always enjoyed their tennis ... I hope that he'll still say the same in a few years' time.
When asked by Wimbledon winner Novak Djokovic how his children were last summer, he said: "Very well, thanks, very well. Trying to get a tennis racket in their hand - and a football!"