Stanislas Wawrinka

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Switzerland's Stanislas Wawrinka poses for photographers 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)

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Switzerland's Stanislas Wawrinka sprays champagne as he celebrates his Australian Open men's singles final win over Spain's Rafael Nadal on Sunday evening in Melbourne, Australia, Monday, Jan. 27, 2014. (AP Photo/Aaron Favila)

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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/Aaron Favila)

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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 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)