Russia's Maria Sharapova hits a return to Japan's Misaki Doi during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 16, 2013. (AP Photo/Rob Griffith)

Associated Press
Russia's Maria Sharapova hits a return to Japan's Misaki Doi during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 16, 2013. (AP Photo/Rob Griffith)
Russia's Maria Sharapova hits a return to Japan's Misaki Doi during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 16, 2013. (AP Photo/Rob Griffith)
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