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Kei Nishikori (R) of Japan leaves the court after the men's singles quarterfinals match against Novak Djokovic of Serbia at 2019 Australian Open in Melbourne, Australia, Jan. 23, 2019. (Xinhua/Bai Xue)
Kei Nishikori (R) of Japan leaves the court after the men's singles quarterfinals match against Novak Djokovic of Serbia at 2019 Australian Open in Melbourne, Australia, Jan. 23, 2019. (Xinhua/Bai Xue)