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(181113) -- LONDON, Nov. 13, 2018 (Xinhua) -- Novak Djokovic (R) of Serbia poses with John Isner of the United States before their men's singles match during the 2018 ATP World Tour Finals at the O2 Arena in London, Britain on Nov. 12, 2018. Djokovic won 2-0. (Xinhua/Han Yan) - - 12.11.2018 Londyn Tenis ATP World Tour Finals Foto: Xinhua / Sipa / Pressfocus POLAND ONLY!!!