FILE - In this Dec. 7, 2012 file photo, Russia's Maria Sharapova eyes the ball during a Gillette Federer Tour exhibition tennis match with Denmark's Caroline Wozniacki in Sao Paulo, Brazil. No. 2-ranked Maria Sharapova has withdrawn from the Brisbane International before her opening match after feeling pain in her right collarbone during practice. The French Open champion on Tuesday, Jan. 1, 2013 said she would head immediately to Melbourne to start preparing for the Australian Open, starting Jan. 14. (AP Photo/Andre Penner, File)

Associated Press
FILE - In this Dec. 7, 2012 file photo, Russia's Maria Sharapova eyes the ball during a Gillette Federer Tour exhibition tennis match with Denmark's Caroline Wozniacki in Sao Paulo, Brazil. No. 2-ranked Maria Sharapova has withdrawn from the Brisbane International before her opening match after feeling pain in her right collarbone during practice. The French Open champion on Tuesday, Jan. 1, 2013 said she would head immediately to Melbourne to start preparing for the Australian Open, starting Jan. 14. (AP Photo/Andre Penner, File)
FILE - In this Dec. 7, 2012 file photo, Russia's Maria Sharapova eyes the ball during a Gillette Federer Tour exhibition tennis match with Denmark's Caroline Wozniacki in Sao Paulo, Brazil. No. 2-ranked Maria Sharapova has withdrawn from the Brisbane International before her opening match after feeling pain in her right collarbone during practice. The French Open champion on Tuesday, Jan. 1, 2013 said she would head immediately to Melbourne to start preparing for the Australian Open, starting Jan. 14. (AP Photo/Andre Penner, File)
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