Roger Federer

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Andy Murray of Great Britain reacts after defeating Roger Federer of Switzerland in the gold medal men's singles match at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Elise Amendola)

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Andy Murray of Great Britain returns to Roger Federer of Switzerland during the gold medal men's singles match at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Elise Amendola)

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** FILE ** Roger Federer of Switzerland leans on the net after he defeated Juan Martin del Potro of Argentina at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)

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Roger Federer of Switzerland celebrates after defeating Juan Martin del Potro of Argentina at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)

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Roger Federer of Switzerland returns to John Isner of the United States at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. (AP Photo/Elise Amendola)

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Roger Federer, who Sunday won his seventh Wimbledon championship, will be participating in his fourth Olympics when the London Games begin July 28. The tennis competition will be staged at the All England Club. (Associated Press)

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Roger Federer improved to 17-7 in Grand Slam finals, including 7-1 at Wimbledon. (Associated Press)

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Roger Federer celebrates July 8, 2012, after winning the men's singles final against Andy Murray at Wimbledon. (Associated Press)

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Roger Federer reacts after winning a set against Novak Djokovic of Serbia during a semifinals match at the All England Lawn Tennis Championships at Wimbledon, England, Friday, July 6, 2012. (AP Photo/Anja Niedringhaus)