If you are interested in sending Roger fan mail then I suggest you go to rogerfederer.com and become a member. It is free to join and it tells you all about fan mail there, however he won't send things to be autographed back but you can send him a letter, that's what I did.
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The email address of Roger Federer is not listed on his official web page. He does have his address listed for fan mail. The address is R. Federer, Postfach 4103 Bottmingen, Switzerland.
R. federer Postfach 4103 Bottmingen Switzerland PS( if ur from the US send an envelope with a return address envelope inside with 2$ US dollars for return stamps)
There isn't a way to email Roger Federer, but you can send him comments on Facebook or on his site