Serbia's Ana Ivanovic returns a ball to Australia's Samantha Stosur during a quarterfinal match at the Kremlin Cup tennis tournament in Moscow, Russia, Friday, Oct. 18, 2013. (AP Photo/Misha Japaridze)

SOFIA, Bulgaria (AP) — Ana Ivanovic beat Sam Stosur 6-2, 5-7, 6-2 on Thursday for her second straight victory in the group stage at the season-ending WTA Tournament of Champions.

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