Roger Federer

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Switzerland's Roger Federer celebrates after winning his match over Ilija Bozoljac of Serbia during their Davis Cup World Group play-off first round tennis match between Serbia and Switzerland, in Novi Sad, Serbia, Friday, Jan. 31, 2014. (AP Photo/Darko Vojinovic)

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10ThingstoSeeSports - Rafael Nadal, of Spain, makes a backhand return to Roger Federer, of Switzerland, during their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014. (AP Photo/Rick Rycroft, File)

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Roger Federer of Switzerland walks off the Rod Laver Arena after his semifinal loss to Rafael Nadal of Spain during their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014.(AP Photo/Andrew Brownbill)

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Roger Federer of Switzerland, right, and Rafael Nadal of Spain walk during the change of end in their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014. (AP Photo/Andrew Brownbill)

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Roger Federer of Switzerland speaks during a press conference after his semifinal loss to Rafael Nadal of Spain at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014. (AP Photo/Aijaz Rahi)