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Aryna Sabalenka of Belarus hits a ball during the quarter final match against Simona Halep of Romania at the WTA Shenzhen Open tennis tournament in Shenzhen, China, Jan. 4, 2018. Sabalenka lost by 0-2. (Xinhua/Mao Siqian)

Aryna Sabalenka of Belarus hits a ball during the quarter final match against Simona Halep of Romania at the WTA Shenzhen Open tennis tournament in Shenzhen, China, Jan. 4, 2018. Sabalenka lost by 0-2. (Xinhua/Mao Siqian)