Roger Federer

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Roger Federer, of Switzerland, wipes sweat from his face between points against Marin Cilic, of Croatia, during the semifinals of the 2014 U.S. Open tennis tournament, Saturday, Sept. 6, 2014, in New York. (AP Photo/Charles Krupa)

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Roger Federer, from Switzerland, celebrates after defeating David Ferrer, from Spain, 6-3, 1-6, 6-2, in a final match at the Western and Southern Open tennis tournament, Sunday, Aug. 17, 2014, in Mason, Ohio. (AP Photo/Al Behrman)

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Novak Djokovic of Serbia defeated Roger Federer of Switzerland during the men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday. (AP Photo/Pavel Golovkin)

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Novak Djokovic of Serbia celebrates defeating Roger Federer of Switzerland in the men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday July 6, 2014. (AP Photo/Ben Curtis)

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Roger Federer of Switzerland celebrates a point against Santiago Giraldo of Colombia during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Saturday, June 28, 2014. (AP Photo/Ben Curtis)

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Roger Federer of Switzerland plays a return to Paolo Lorenzi of Italy during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 24, 2014. (AP Photo/Pavel Golovkin)

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ADVANCE FOR WEEKEND EDITIONS, JUNE 21-22 - FILE - In this June 26, 2013, file photo, Roger Federer of Switzerland returns to Sergiy Stakhovsky of Ukraine during their Men's second round singles match at the All England Lawn Tennis Championships in Wimbledon, London. If Federer, now 32 and a father of four, is going to seriously contend for an 18th major title, it figures to come at Wimbledon, because he excels on grass, last year's stunning second-round exit notwithstanding. (AP Photo/Alastair Grant, File)