Samantha Stosur of Australia reacts after her tennis match against Maria Sharapova of Russia on the fourth day of the WTA championship in Istanbul, Turkey, Friday, Oct. 26, 2012. (AP Ph

 

              Samantha Stosur of Australia reacts after her tennis match against Maria Sharapova of Russia on the fourth day of the WTA championship in Istanbul, Turkey, Friday, Oct. 26, 2012. (AP Ph
Samantha Stosur of Australia reacts after her tennis match against Maria Sharapova of Russia on the fourth day of the WTA championship in Istanbul, Turkey, Friday, Oct. 26, 2012. (AP Photo)