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(170909) -- NEW YORK, Sept. 9, 2017 (Xinhua) -- Juan Martin del Potro of Argentina returns a ball to Rafael Nadal of Spain during the men's singles semifinal match at the 2017 U.S. Open in New York, the United States, Sept. 8, 2017. Juan Martin del Potro lost 1-3. (Xinhua/Qin Lang) - Qin Lang - 08.09.2017 Nowy Jork Tenis US Open 2017 Yan Lerval / Sipa / PressFocus POLAND ONLY!!