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SINGAPORE - OCTOBER 27: Maria Sharapova of Russia in action against Simona Halep of Romania in a round robin match during the BNP Paribas WTA Finals at Singapore Sports Hub on October 27, 2015 in Singapore. (Photo by Clive Brunskill/Getty Images)

SINGAPORE - OCTOBER 27:  Maria Sharapova of Russia in action against Simona Halep of Romania in a round robin match during the BNP Paribas WTA Finals at Singapore Sports Hub on October 27, 2015 in Singapore.  (Photo by Clive Brunskill/Getty Images)