
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 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)
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