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(200130) -- MELBOURNE, Jan. 30, 2020 (Xinhua) -- Novak Djokovic of Serbia hits a return 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/Zhu Hongye) - Zhu Hongye - 30.01.2020 Melbourne Tenis Australian Open 2020 Xinhua / Sipa / PressFocus POLAND ONLY!!