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(181005) -- BEIJING, Oct. 5, 2018 (Xinhua) -- Juan Martin Del Potro of Argentina hits a return during the men's singles quarterfinal match against Filip Krajinovic of Serbia at China Open tennis tournament in Beijing, China, Oct. 5, 2018. Del Potro won 2-0. (Xinhua/Song Yanhua) - - 05.10.2018 Pekin Tenis China Open 2018 Xinhua / Sipa / PressFocus POLAND ONLY!!