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(170905) -- NEW YORK, Sept. 5, 2017 () -- Juan Martin del Potro of Argentina celebrates after the men's singles fourth round match against Dominic Thiem of Austria at the 2017 U.S. Open in New York, the United States, Sept. 4, 2017. Juan Martin del Potro won 3-2 to enter the next round. (/Qin Lang) (KEYSTONE/XINHUA/Qin Lang)