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Latvia's Jelena Ostapenko, United States' Venus Williams, Czech's Karolina Pliskova and Romania's Simona Halep (From L to R) attend the WTA Finals official draw ceremony held in Singapore on Oct. 20, 2017. (Xinhua/Then Chih Wey)
Latvia's Jelena Ostapenko, United States' Venus Williams, Czech's Karolina Pliskova and Romania's Simona Halep (From L to R) attend the WTA Finals official draw ceremony held in Singapore on Oct. 20, 2017. (Xinhua/Then Chih Wey)