Serena Williams of the US receives treatment from a trainer during her quarterfinal match against compatriot Sloane Stephens at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Rob Griffith)

Associated Press
Serena Williams of the US receives treatment  from a trainer during her quarterfinal match against compatriot Sloane Stephens at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Rob Griffith)
Serena Williams of the US receives treatment from a trainer during her quarterfinal match against compatriot Sloane Stephens at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 23, 2013. (AP Photo/Rob Griffith)
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