Switzerland's Roger Federer serves to France's Jo-Wilfried Tsonga during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Aaron Favila)

Associated Press
Switzerland's Roger Federer serves to France's Jo-Wilfried Tsonga during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Aaron Favila)
Switzerland's Roger Federer serves to France's Jo-Wilfried Tsonga during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Aaron Favila)
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