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BEIJING, CHINA - SEPTEMBER 30: Petra Martic of Croatia returns a shot against Elise Mertens of Belgium during the women's singles first round match of 2019 China Open at the China National Tennis Center on September 30, 2019 in Beijing, China. (Photo by Xinyu Cui/Getty Images)

BEIJING, CHINA - SEPTEMBER 30: Petra Martic of Croatia returns a shot against Elise Mertens of Belgium during the women's singles first round match of 2019 China Open at the China National Tennis Center on September 30, 2019 in Beijing, China. (Photo by Xinyu Cui/Getty Images)
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