Karen Khachanov of Russia hits a return to Kei Nishikori of Japan during a men's singles second round match at the 2016 U.S. Open tennis tournament in New York, the United States, Sept. 1, 2016. Khachanov lost the match 1-3. (Xinhua/Qin Lang)
Karen Khachanov of Russia hits a return to Kei Nishikori of Japan during a men's singles second round match at the 2016 U.S. Open tennis tournament in New York, the United States, Sept. 1, 2016. Khachanov lost the match 1-3. (Xinhua/Qin Lang)
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