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John Isner of the United States serves during the men's singles second round match against Daniel Evans of Britain at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 3, 2019. (Xinhua/Zhang Hongxiang)
John Isner of the United States serves during the men's singles second round match against Daniel Evans of Britain at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 3, 2019. (Xinhua/Zhang Hongxiang)