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(161121) -- LONDON, Nov. 21, 2016 (Xinhua) -- Serbia's Novak Djokovic returns the ball during the men's singles final against Andy Murray of Britain at the 2016 ATP World Tour Finals at the O2 Arena in London, Britain on Nov. 20, 2016. Djokovic lost 0-2. (Xinhua/Han Yan)(wll) 20.11.2016 Londyn Tenis ziemny ATP World Tour Finals 2016 FOTO Xinhua / SIPA / PressFocus POLAND ONLY!!