With all the talk about Nadal's knees that is definitely one thing Federer has to be given a lot of credit for. Nadal is thought to be in peak physical condition and now some health troubles are beginning to surface. With the exception of Mononucleosis last year (he still made the SF at the Australian Open BTW), Federer has been nearly invincible health-wise.
Tennis is a tough game to stay healthy and in shape like that.
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