Ana Ivanovic of Serbia returns a shot to Simona Halep of Romania during their semi-final tennis match of the WTA Tournament of the Champions in Sofia, Bulgaria,  Saturday, Nov. 2, 2013. (AP Photo/ Valentina Petrova)

Bulgaria Tennis WTA Tournment

Ana Ivanovic of Serbia returns a shot to Simona Halep of Romania during their semi-final tennis match of the WTA Tournament of the Champions in Sofia, Bulgaria, Saturday, Nov. 2, 2013. (AP Photo/ Valentina Petrova)

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