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BEIJING, CHINA - OCTOBER 01: Aryna Sabalenka of Belarus returns a shot against Daria Kasatkina of Russia during the women's singles second round match of 2019 China Open at the China National Tennis Center on October 1, 2019 in Beijing, China. (Photo by Zhe Ji/Getty Images)

BEIJING, CHINA - OCTOBER 01:  Aryna Sabalenka of Belarus returns a shot against Daria Kasatkina of Russia during the women's singles second round match of 2019 China Open at the China National Tennis Center on October 1, 2019 in Beijing, China.  (Photo by Zhe Ji/Getty Images)