Rafael Nadal

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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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Stanislas Wawrinka of Switzerland signs autographs for fans, after defeating Rafael Nadal of Spain during the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014. (AP Photo/Andrew Brownbill)

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Stanislas Wawrinka of Switzerland kisses the trophy after defeating Rafael Nadal of Spainduring the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Aaron Favila)

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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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Switzerland's Stanislas Wawrinka poses with his Australian Open trophy on the banks of the Yarra River following his win over Spain's Rafael Nadal on Sunday evening in Melbourne, Australia, Monday, Jan. 27, 2014. (AP Photo/Mark Baker)