![Juan Martin del Potro, of Argentina, pauses between serves from Rafael Nadal, of Spain, during the semifinals of the U.S. Open tennis tournament, Friday, Sept. 8, 2017, in New York. (AP Photo/Adam Hunger)](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/YVB2LMJUATHLMO7C2NYM7MUEUM.jpg?smart=true&auth=682e93d4a4b82ae02286a2b39cfbecda9cae6ae1f1c11098a2b34c6010977729&width=400&height=225)
Juan Martin del Potro was frustrated by his four-set loss to Rafael Nadal in the US Open semi-finals. Adam Hunger / AP Photo
Juan Martin del Potro was frustrated by his four-set loss to Rafael Nadal in the US Open semi-finals. Adam Hunger / AP Photo
Juan Martin del Potro backs Rafael Nadal to go on to become US Open champion
The Argentine frustrated by his four-set loss to the world No 1 after winning the first set of semi-final clash in New York.
Agence France Presse
09 September, 2017