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(201121) -- LONDON, Nov. 21, 2020 (Xinhua) -- Novak Djokovic of Serbia hits a return during the singles group match against Alexander Zverev of Germany at the ATP World Tour Finals 2020 in London, Britain, on Nov. 20, 2020. (Xinhua/Han Yan) 20.11.2020 Londyn Tenis ATP World Tour Finals 2020 FOTO Xinhua / PressFocus POLAND ONLY!!