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(190115) -- MELBOURNE, Jan. 15, 2019 (Xinhua) -- Novak Djokovic of Serbia returns the ball 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/Bai Xuefei) - - 15.01.2019 Melbourne Tenis Australian Open 2019 Foto: Xinhua / SIPA / Pressfocus