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Caroline Pliskova of Czech Republic returns the ball during the group match against Garbine Muguruza of Spain at the WTA Finals tennis tournament in Singapore, on Oct. 24, 2017. Pliskova won 2-0. (Xinhua/Then Chih Wey)

Caroline Pliskova of Czech Republic returns the ball during the group match against Garbine Muguruza of Spain at the WTA Finals tennis tournament in Singapore, on Oct. 24, 2017. Pliskova won 2-0. (Xinhua/Then Chih Wey)