"This is a bittersweet moment" Tennis legend Roger Federer has announced his retirement at the age of 41. The 20-time grand-slam champion made the announcement via a letter posted on social media, having struggled with a knee problem for the last three years. In the announcement, Federer said: "Of all the gifts that tennis has given me over the years, the greatest, without a doubt, has been the people I’ve met along the way: my friends, my competitors, and most of all the fans who give the sport its life." “As many of you know, the past three years have presented me with challenges in the form of injuries and surgeries. I’ve worked hard to return to full competitive form. But I also know my body’s capacities and limits, and its message to me lately has been clear ... Tennis has treated me more generously than I ever would have dreamt, and now I must recognise when it is time to end my competitive career. "The last 24 years on Tour have been an incredible adventure. While it sometimes feels like it went by in 24 hours, it has also been so deep and magical that it seems as if I’ve already lived a full lifetime.” Federer will play in next week’s Laver Cup in London, the Ryder Cup-style competition that was his brainchild, but then says he will leave the professional game. #rogerfederer #tennis