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