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Ivo Karlovic of Croatia competes 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)
Ivo Karlovic of Croatia competes 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)