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Mitchell Krueger of the United States returns the shot during the men's singles first round match against Novak Djokovic of Serbia at the Australian Open in Melbourne, Australia, Jan. 15, 2018. (Xinhua/Lui Siu Wai)
Mitchell Krueger of the United States returns the shot during the men's singles first round match against Novak Djokovic of Serbia at the Australian Open in Melbourne, Australia, Jan. 15, 2018. (Xinhua/Lui Siu Wai)