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Caroline Pliskova of Czech Republic serves 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 serves 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)