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Kei Nishikori of Japan returns the ball 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 returns the ball 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)