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Kei Nishikori of Japan competes during the men's single's 3rd round match between Kei Nishikori of Japan and Joao Sousa of Portugal at 2019 Australian Open in Melbourne, Australia, on Jan. 19, 2019. (Xinhua/Hu Jingchen)
Kei Nishikori of Japan competes during the men's single's 3rd round match between Kei Nishikori of Japan and Joao Sousa of Portugal at 2019 Australian Open in Melbourne, Australia, on Jan. 19, 2019. (Xinhua/Hu Jingchen)