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(190115) -- MELBOURNE, Jan. 15, 2019 (Xinhua) -- Novak Djokovic of Serbia celebrates during the men's singles first round match against Mitchell Krueger of the United States at the Australian Open in Melbourne, Australia, Jan. 15, 2018. (Xinhua/Lui Siu Wai) - lvxiaowei - 15.01.2019 Melbourne Tenis Australian Open 2019 Foto: Xinhua / SIPA / Pressfocus