
Dusan Lajovic of Serbia hits a return during the men's singles first round match against Rafael Nadal of Spain at the 2017 US Open tennis tournament in New York, the United States, Aug. 29, 2017. (Xinhua/Wang Ying)

Dusan Lajovic of Serbia hits a return during the men's singles first round match against Rafael Nadal of Spain at the 2017 US Open tennis tournament in New York, the United States, Aug. 29, 2017. (Xinhua/Wang Ying)