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** FILE ** In this Jan. 24, 2008 file photo, Maria Sharapova returns to Serbia's Jelena Jankovic at the Australian Open tennis tournament in Melbourne, Australia, Thursday, Jan. 24, 2008. Sharapova's agent says the former No. 1 player is "on track" to return to Grand Slam tennis by defending her title at the Australian Open. (AP Photo/Rob Griffith, File)