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Simona Halep of Romania reacts during the match against Caroline Wozniacki of Denmark at the WTA Finals tennis tournament in Singapore, on Oct. 25, 2017. (Xinhua/Then Chih Wey)
Simona Halep of Romania reacts during the match against Caroline Wozniacki of Denmark at the WTA Finals tennis tournament in Singapore, on Oct. 25, 2017. (Xinhua/Then Chih Wey)