“It’s already good. Same with my boys.”On being a royal favourite, he added: “I think I have a little advantage that I actually spent some time, you know, with him. “So maybe I’m the only player he’s ever met, then you have a little head start in who is your favourite player.”He added: “Look, he’s a cute boy. I love to see that they’re into tennis or into sports. Definitely.“You know, his mum has always enjoyed tennis. That’s it. I hope that he’ll still say the same in a few years’ time. This is not just an in-the-moment situation that he said, ‘Oh, he’s a good guy. I’ve just seen him recently.’”The Duchess revealed that her eldest son had taken up tennis in 2017, when he was four. It emerged that she had asked Judy Murray for advice as Prince George just wanted to “whack a ball.” The revelation was clearly music to Federer’s ears. When the news was relayed to him after his match on Thursday, the tennis champion beamed from ear to ear and could not resist a celebratory little fist pump.“That’s very big,” he grinned.Asked about the young prince’s technique, he was complimentary.“At that stage it’s all about just touch the ball,” he said. Switzerland’s Roger Federer celebrates after winning his second round match against Britain’s Jay ClarkeCredit:Andrew Couldridge /Reuters Roger Federer knocked a young British hopeful out of Wimbledon on Thursday but was rather more benevolent to another up and coming player, Prince George, it has emerged.The world number three made light work of Jay Clarke in the second round, dispatching him from the competition in straight sets. But he later spoke warmly about taking on the five-year-old prince at the Middleton family home in Bucklebury, Berks.Federer is a long-time family friend of the Middletons. He and his wife Mirka attended the marriage of Kate’s younger sister, Pippa, to James Matthews in 2017.The Duchess revealed during a visit to Wimbledon on Tuesday that Prince George was a huge tennis fan and had been practising his swing with Federer.She told retired British player Anne Keothavong, whom she sat next to on Court 14, that the 37-year-old veteran was her son’s favourite. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.