Nadal, Isner Battle Into U.S. Open Fourth Round
Rafael Nadal and Karen Khachanov battled for more than four hours in a U.S. Open third-round clash on Friday, with the defending champion and top-seeded Spaniard prevailing 5-7, 7-5, 7-6(7), 7-6(3) inside Arthur Ashe Stadium. “It was a physical, demanding match,” Nadal said afterwards. “It was a mentally demanding match. That’s why we practice…

