Roger Federer and the End of Athlete's Knee

Roger Federer has retired, mostly due to his knee. This is tragic but extremely common and often avoidable. Here is how.

Tennis: Roger Federer rules out Australian Open return - Yahoo Sports

Roger Federer - Wikipedia

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Roger Federer announces he is retiring from tennis at the age of

Roger Federer: Wimbledon not likely next year – but I am fighting

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Roger Federer still not 100 percent: “It will be tight for the

Roger Federer, Biography, Championships, & Facts

Roger Federer undergoes knee surgery