NEW YORK — Rafael Nadal retired from his U.S. Open semifinal after receiving medical treatment on his right knee, sending Juan Martin del Potro into Sunday’s final.
Nadal, a 17-time Grand Slam champion, mentioned retirement to the chair umpire midway through the second set, then threw in the towel after dropping the set. Del Potro had a 7-6 (3), 6-2 lead.
His right leg was taped just below the knee in the first set and again in the second, after he had ripped off the tape. Nadal winced and limped in the second set.