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China's Zhang Shuai hits a return during the singles second round match against Jennifer Brady of the United States at 2017 WTA Hong Kong tennis Open in Hong Kong, south China, Oct. 12, 2017. (Xinhua/Lo Ping Fai)

China's Zhang Shuai hits a return during the singles second round match against Jennifer Brady of the United States at 2017 WTA Hong Kong tennis Open in Hong Kong, south China, Oct. 12, 2017. (Xinhua/Lo Ping Fai)