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(181115) -- LONDON, Nov. 15, 2018 (Xinhua) -- Novak Djokovic of Serbia celebrates after the singles match against Alexander Zverev of Germany during Day 4 of the 2018 ATP World Tour Finals at the O2 Arena in London, Britain on Nov. 14, 2018. Djokovic won 2-0. (Xinhua/Han Yan) - - 15.11.2018 Londyn Tenis ATP World Tour Finals Xinhua / SIPA / PressFocus POLAND ONLY!!