Serena Williams of the US reacts during her quarterfinal match against compatriot Sloane Stephens at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Aaron Favila)

Associated Press
Serena Williams of the US reacts during her quarterfinal match against compatriot Sloane Stephens at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Aaron Favila)
Serena Williams of the US reacts during her quarterfinal match against compatriot Sloane Stephens at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Aaron Favila)
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