Samantha Stosur of Australia returns a shot to Maria Sharapova of Russia on the fourth day of the WTA tennis championships in Istanbul, Turkey, Friday, Oct. 26, 2012. (AP Photo)

 

              Samantha Stosur of Australia returns a shot to Maria Sharapova of Russia on the fourth day of the WTA tennis championships in Istanbul, Turkey, Friday, Oct. 26, 2012. (AP Photo)
Samantha Stosur of Australia returns a shot to Maria Sharapova of Russia on the fourth day of the WTA tennis championships in Istanbul, Turkey, Friday, Oct. 26, 2012. (AP Photo)