
John Isner of the United States hits a return during the men's singles quarterfinal match against Tommy Paul of the United States at the 2020 ATP Mexican Open tennis tournament in Acapulco, Mexico, Feb. 27, 2020. (Xinhua/Francisco Canedo)

John Isner of the United States hits a return during the men's singles quarterfinal match against Tommy Paul of the United States at the 2020 ATP Mexican Open tennis tournament in Acapulco, Mexico, Feb. 27, 2020. (Xinhua/Francisco Canedo)