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(190115) -- MELBOURNE, Jan. 15, 2019 (Xinhua) -- Novak Djokovic of Serbia returns the shot 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