Spain's Rafael Nadal returns the ball to Ukraine's Alexandr Dolgopolov during their 2017 US Open Men's Singles Round 4 match at the USTA Billie Jean King National Tennis Center in New York on September 4, 2017 Nadal won the match 6-2, 6-4, 6-1. / AFP PHOTO / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
