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Tuesday 13 November 2018 20:05, UK
Roger Federer has confirmed that his four-year-old sons Leo and Lenny have been playing tennis "for a few years now".
The 20-time Grand Slam champion, widely regarded as one of the best in the history of the game, is currently competing at the season-ending ATP Finals at The O2 in London.
Federer, 37, fell to defeat in his opening match against Japan's world No 9 Kei Nishikori and faces Dominic Thiem - live on Sky Sports Arena - later on Tuesday night in Group Lleyton Hewitt.
"They're only four, yes, but they've played for a few years now," the Swiss said of his four-year-old twin sons.
"We roll the ball and hit it along the ground. The ball can bounce a bit more and they can whack it over the net sometimes."
Federer also has another pair of twins, nine-year-old girls Charlene and Myla, who he confirmed have also taken up tennis.
"The girls also play a little bit. Actually we like them to play a bit because all the friends we have and their kiddies, they all play tennis and it would be a shame if my kids are the only ones who wouldn't play tennis.
"I want them to do sports because I think it's a great education, it's good to be out there and healthy."
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We will have coverage of the ATP Finals at London's O2 with every match live on Sky Sports. See TV listings HERE.
