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(181005) -- BEIJING, Oct. 5, 2018 (Xinhua) -- Juan Martin Del Potro of Argentina serves 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/Kong Hui) - - 05.10.2018 Pekin Tenis China Open 2018 Xinhua / Sipa / PressFocus POLAND ONLY!!