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World number three tennis player Simona Halep of Romania takes part in a yoga session at skypark observation deck at the top of the Marina Bay Sands in Singapore on July 22, 2015. Halep made a one-day appearance in Singapore as the countdown to the BNP Paribas WTA finals in October. AFP PHOTO / ROSLAN RAHMAN (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)

World number three tennis player Simona Halep of Romania takes part in a yoga session at skypark observation deck at the top of the Marina Bay Sands in Singapore on July 22, 2015. Halep made a one-day appearance in Singapore as the countdown to the BNP Paribas WTA finals in October.     AFP PHOTO / ROSLAN RAHMAN        (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)