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Simona Halep of Romania reacts during the group match against Caroline Garcia of France at WTA Finals tennis tournament in Singapore, Oct. 23, 2017. (Xinhua/Then Chih Wey)

Simona Halep of Romania reacts during the group match against Caroline Garcia of France at WTA Finals tennis tournament in Singapore, Oct. 23, 2017. (Xinhua/Then Chih Wey)