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SINGAPORE - NOVEMBER 01: Sania Mirza of India and Martina Hingis of Switzerland celebrate defeating Carla Suarez Navarro and Garbine Muguruza of Spain in the doubles final match during the BNP Paribas WTA Finals at Singapore Sports Hub on November 1, 2015 in Singapore. (Photo by Julian Finney/Getty Images)

SINGAPORE - NOVEMBER 01:  Sania Mirza of India and Martina Hingis of Switzerland  celebrate defeating Carla Suarez Navarro and Garbine Muguruza of Spain in the doubles final match during the BNP Paribas WTA Finals at Singapore Sports Hub on November 1, 2015 in Singapore.  (Photo by Julian Finney/Getty Images)