Del Potro Advances to U.S. Open Final When Nadal Retires With Injury
3:57pm PDT - September 7th, 2018 novak djokovic - The New York TimesJuan Martin del Potro reached his first Grand Slam final since 2009, winning the first two sets, 7-6 (3), 6-2, before Rafael Nadal stopped the match with an apparent knee injury.