Russia's Maria Sharapova hits the ball during the semi-final match against Germany's Angelique Kerber at the WTA Porsche Tennis Grand Prix in Stuttgart, Germany, Saturday, April 27, 2013. (AP Photo/dpa, Bernd Weissbrod)

Associated Press
Russia's Maria Sharapova hits the ball during the semi-final match against Germany's  Angelique Kerber at the WTA Porsche Tennis Grand Prix in Stuttgart, Germany, Saturday, April 27, 2013. (AP Photo/dpa, Bernd Weissbrod)
Russia's Maria Sharapova hits the ball during the semi-final match against Germany's Angelique Kerber at the WTA Porsche Tennis Grand Prix in Stuttgart, Germany, Saturday, April 27, 2013. (AP Photo/dpa, Bernd Weissbrod)
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