
Rafael Nadal of Spain returns a ball to Borna Coric of Croatia during the men's singles first round match at the 2015 U.S. Open in New York, the United States, Aug. 31, 2015. Rafael Nadal won 3-1. (Xinhua/Qin Lang)

Rafael Nadal of Spain returns a ball to Borna Coric of Croatia during the men's singles first round match at the 2015 U.S. Open in New York, the United States, Aug. 31, 2015. Rafael Nadal won 3-1. (Xinhua/Qin Lang)