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(190902) -- NEW YORK, Sept. 2, 2019 (Xinhua) -- Novak Djokovic of Serbia hits a return during the men's singles fourth round match between Novak Djokovic of Serbia and Stan Wawrinka of Switzerland at the 2019 US Open tennis championships in New York, the United States, Sept. 1, 2019. Wawrinka advanced into quarterfinals as Djokovic retired. (Xinhua/Li Muzi) 01.09.2019 New York Tenis ziemny US Open 2019 FOTO Xinhua / PressFocus POLAND ONLY!!