The Australian Open

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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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Italy's Sara Errani, right, and Roberta Vinci, left, celebrate after defeating Russia's Ekaterina Makarova and Elena Vesnina in their women’s doubles final at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014.(AP Photo/Andrew Brownbill)

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Rafael Nadal of Spain makes a backhand return to Stanislas Wawrinka of Switzerland during the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Rick Rycroft)

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Rafael Nadal of Spain grimaces as he receives a medical treatment to his back in the men's singles final against Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Andrew Brownbill)

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Rafael Nadal of Spain reacts as he plays Stanislas Wawrinka of Switzerland during 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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Rafael Nadal of Spain speaks during a press conference after his loss to Stanislas Wawrinka of Switzerland in 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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Rafael Nadal of Spain waves to the spectators during the trophy presentation after his loss to Stanislas Wawrinka of Switzerland in 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 holds up the trophy after defeating Rafael Nadal of Spain in 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 poses with the trophy, along with ball boys and girls, after defeating Rafael Nadal of Spain in 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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In this photo released by Tennis Australia, Stanislas Wawrinka of Switzerland holds his trophy aloft after defeating Spain's Rafael Nadal to win the men's singles title at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014. (AP Photo/Tennis Australia,Fiona Hamilton)

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Stanislas Wawrinka of Switzerland, left, talks with Rafael Nadal of Spain before the trophy presentation, following his win in 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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Rafael Nadal of Spain grimaces as he receives a medical treatment to his back in the men's singles final against Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Andrew Brownbill)