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Jelena Ostapenko of Latvia competes during the group match against Venus Williams of United States at WTA Finals tennis tournament in Singapore, Oct. 24, 2017. (Xinhua/Then Chih Wey)

Jelena Ostapenko of Latvia competes during the group match against Venus Williams of United States at WTA Finals tennis tournament in Singapore, Oct. 24, 2017. (Xinhua/Then Chih Wey)