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Karolina Pliskova of the Czech Republic reacts during the match against Jelena Ostapenko of Latvia at the WTA Finals tennis tournament in Singapore, on Oct. 26, 2017. (Xinhua/Then Chih Wey)

Karolina Pliskova of the Czech Republic reacts during the match against Jelena Ostapenko of Latvia at the WTA Finals tennis tournament in Singapore, on Oct. 26, 2017. (Xinhua/Then Chih Wey)