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John Isner of the United States serves during the men's singles second round match against Leonardo Mayer of Argentina at the China Open tennis tournament in Beijing on Oct. 5, 2017. John Isner won 2-0. (Xinhua/Zhang Chenlin)
John Isner of the United States serves during the men's singles second round match against Leonardo Mayer of Argentina at the China Open tennis tournament in Beijing on Oct. 5, 2017. John Isner won 2-0. (Xinhua/Zhang Chenlin)