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(200130) -- MELBOURNE, Jan. 30, 2020 (Xinhua) -- Novak Djokovic of Serbia serves during the men's singles semifinal match between Novak Djokovic of Serbia and Rodger Federer of Switzerland at the Australian Open tennis tournament in Melbourne, Australia on Jan. 30, 2020. (Xinhua/Bai Xuefei) - Bai Xuefei - 30.01.2020 Melbourne Tenis Australian Open 2020 Xinhua / Sipa / PressFocus POLAND ONLY!!