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Caroline Wozniacki of Denmark reacts during the group match against Elina Svitolina of Ukraine at WTA Finals tennis tournament in Singapore, Oct. 23, 2017. (Xinhua/Then Chih Wey)
Caroline Wozniacki of Denmark reacts during the group match against Elina Svitolina of Ukraine at WTA Finals tennis tournament in Singapore, Oct. 23, 2017. (Xinhua/Then Chih Wey)