Roger Federer

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Roger Federer of Switzerland puts off the shirt during a break in his fourth round match against Jo-Wilfried Tsonga of France at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)

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Roger Federer of Switzerland serves to Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)

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Roger Federer of Switzerland serves to Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aijaz Rahi)