Serena Williams of the United States reacts after winning a point during her quarterfinal match against her compatriot Sloane Stephens at the Brisbane International tennis tournament held in Brisbane, Australia, Thursday, Jan. 3, 2013.  (AP Photo/Tertius Pickard)

Photo by: Tertius Pickard

Serena Williams of the United States reacts after winning a point during her quarterfinal match against her compatriot Sloane Stephens at the Brisbane International tennis tournament held in Brisbane, Australia, Thursday, Jan. 3, 2013. (AP Photo/Tertius Pickard)