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Kei Nishikori of Japan celebrates during the men's singles first round match against Kamil Majchrzak of Poland at the Australian Open in Melbourne, Australia, Jan. 15, 2018. (Xinhua/Bai Xue)

Kei Nishikori of Japan celebrates during the men's singles first round match against Kamil Majchrzak of Poland at the Australian Open in Melbourne, Australia, Jan. 15, 2018. (Xinhua/Bai Xue)