Russia's Maria Sharapova returns the ball to China's Na Li at the Italian Open tennis finals, in Rome, May 20, 2012.
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Maria Sharapova of Russia serves to Alexandra Cadantu of Romania during the French Open tennis tournament at the Roland Garros stadium in Paris May 29, 2012.
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Maria Sharapova holds the trophy after defeating Li Na of China at the Rome Masters tennis tournament May 20, 2012.
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Maria Sharapova serves to Li Na of China during their final match at the Rome Masters tennis tournament May 20, 2012.
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Maria Sharapova of Russia eyes the ball as she hits a return to Angelique Kerber of Germany during their match at the Rome Masters tennis tournament May 19, 2012.
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Russia's Maria Sharapova hits a return to Belarus' Victoria Azarenke during their women's singles final match at the WTA tennis tournament in Stuttgart April 29, 2012.
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Maria Sharapova holds the winner's trophy after defeating Serena Williams in the women's singles final match at Wimbledon in 2004. Sharapova won 6-1, 6-4.
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Maria Sharapova holds the women's US Open trophy at the tennis tournament in New York in 2006. Sharapova defeated Belgium's Justine Henin-Hardenne in the final.
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Maria Sharapova enjoys a career as a model, with endorsements ranging from Range Rover to Nike. In 2007, Forbes magazine listed her as the highest-paid female athlete in the world, with annual earnings of more than $26 million.
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Maria Sharapova makes a backhand return to Ioana Raluca Olaru of Romania at the All England Lawn Tennis Championships at Wimbledon, June 2010.
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Paul J. Bereswill/AP
Maria Sharapova cheers after winning her match against Jarmila Groth of Australia during the first round of the US Open tennis tournament in New York in August, 2010.