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Kiki Bertens of the Netherlands serves during the women's singles second round match against Kirsten Flipkens of Belgium at China Open tennis tournament in Beijing, China, Oct. 2, 2018. Bertens won 2-0. (Xinhua/Luo Yuan)
Kiki Bertens of the Netherlands serves during the women's singles second round match against Kirsten Flipkens of Belgium at China Open tennis tournament in Beijing, China, Oct. 2, 2018. Bertens won 2-0. (Xinhua/Luo Yuan)