Frances Tiafoe of the United States returns a shot to his compatriot John Isner during a match of the men's singles first round at the U.S. Open tennis tournament in New York, the United States, Aug. 29, 2016. John Isner won 3-2. (Xinhua/Qin Lang)
Frances Tiafoe of the United States returns a shot to his compatriot John Isner during a match of the men's singles first round at the U.S. Open tennis tournament in New York, the United States, Aug. 29, 2016. John Isner won 3-2. (Xinhua/Qin Lang)
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