Del Potro into US Open final after defending champion Nadal retires in semis

Juan Martin del Potro (L) of Argentina hugs Rafael Nadal of Spain after Rafael Nadal retired from the men's singles semifinal match at the 2018 US Open tennis tournament in New York, the United States, Sept. 7, 2018. Juan Martin del Potro won as Nadal retired due to injury. (Xinhua/Wang Ying)