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

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