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