Rafa Nadal survived a heroic Daniil Medvedev fightback to claim an epic 7-5 6-3 5-7 4-6 6-4 win and a fourth U.S. Open title on Sunday, moving within one Grand Slam crown of matching Roger Federer's record of 20. A routine end to the Flushing Meadows fortnight looked on the cards when Nadal, already two sets up, broke for a 3-2 lead over the tall Russian in the third with the