Maria Sharapova from Russia clinches the fist during the final of the WTA tennis Porsche GP against Na Li from China in Stuttgart, Germany, Sunday, April 28, 2013. (AP Photo/Daniel Maurer)

Associated Press
Maria Sharapova from Russia clinches the fist during the final of the WTA tennis Porsche GP against Na Li from China in Stuttgart, Germany, Sunday, April 28, 2013. (AP Photo/Daniel Maurer)
Maria Sharapova from Russia clinches the fist during the final of the WTA tennis Porsche GP against Na Li from China in Stuttgart, Germany, Sunday, April 28, 2013. (AP Photo/Daniel Maurer)
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