Novak Djokovic of Serbia returns a ball to Gael Monfils of France during men's singles semi-final match at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Novak Djokovic of Serbia (L) and Gael Monfils of France greet each other after men's singles semi-final match at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Novak Djokovic of Serbia reacts during men's singles semi-final match against Gael Monfils of France at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Novak Djokovic of Serbia returns a ball to Gael Monfils of France during men's singles semi-final match at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Gael Monfils of France reacts during men's singles semi-final match against Novak Djokovic of Serbia at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Gael Monfils of France returns a ball to Novak Djokovic of Serbia during men's singles semi-final match at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Novak Djokovic of Serbia returns a ball to Gael Monfils of France during men's singles semi-final match at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
Gael Monfils of France returns a ball to Novak Djokovic of Serbia during men's singles semi-final match at the 2016 U.S. Open in New York, the United States, Sept. 9, 2016. Djokovic won 3-1. (Xinhua/Yin Bogu)
