Russia's Maria Sharapova serves to Poland's top seed Agnieszka Radwanska during their quarterfinal match at the Porsche tennis Grand Prix in Stuttgart, Germany, Friday, April 25, 2014. Sharapova won the match with 6-4 and 6-3. (AP Photo/dpa,Daniel Maurer)

Germany Tennis Porsche Grand Prix

Russia's Maria Sharapova serves to Poland's top seed Agnieszka Radwanska during their quarterfinal match at the Porsche tennis Grand Prix in Stuttgart, Germany, Friday, April 25, 2014. Sharapova won the match with 6-4 and 6-3. (AP Photo/dpa,Daniel Maurer)

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