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Jelena Ostapenko of Latvia celebrates after winning 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 celebrates after winning 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)