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Garbine Muguruza of Spain reacts after winning the group match against Latvia's Jelena Ostapenko at WTA Finals tennis tournament in Singapore, Oct. 22, 2017. (Xinhua/Then Chih Wey)

Garbine Muguruza of Spain reacts after winning the group match against Latvia's Jelena Ostapenko at WTA Finals tennis tournament in Singapore, Oct. 22, 2017. (Xinhua/Then Chih Wey)