
Rafael Nadal of Spain hits a return to Juan Martin del Potro of Argentina during the men's singles semifinal match at the 2017 U.S. Open in New York, the United States, Sept. 8, 2017. Rafael Nadal won 3-1 to enter the final. (Xinhua/Wang Ying)

Rafael Nadal of Spain hits a return to Juan Martin del Potro of Argentina during the men's singles semifinal match at the 2017 U.S. Open in New York, the United States, Sept. 8, 2017. Rafael Nadal won 3-1 to enter the final. (Xinhua/Wang Ying)