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Caroline Wozniacki of Denmark returns the ball during women's singles round 64 match against Wang Qiang of China at China Open in Beijing, capital of China, on Oct. 1, 2017. Wozniacki won 2-1. (Xinhua/He Changshan)

Caroline Wozniacki of Denmark returns the ball during women's singles round 64 match against Wang Qiang of China at China Open in Beijing, capital of China, on Oct. 1, 2017. Wozniacki won 2-1. (Xinhua/He Changshan)