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Kei Nishikori of Japan celebtates during the men's second round match between Kei Nishikori of Japan and Ivo Karlovic of Croatia at the 2019 Australian Open in Melbourne, Australia, Jan. 17, 2019. (Xinhua/Bai Xuefei)
Kei Nishikori of Japan celebtates during the men's second round match between Kei Nishikori of Japan and Ivo Karlovic of Croatia at the 2019 Australian Open in Melbourne, Australia, Jan. 17, 2019. (Xinhua/Bai Xuefei)