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

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