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/Andy Wong)

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/Andy Wong)
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/Andy Wong)
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