Federer finally breaks Isner
Isner had not lost his serve for the entire tournament, until his very last service game.
The American had held on for 56 straight service games until Federer, who had already won two tie-breaks, clinched the match when Isner sent a volley wide.
Roger Federer and John Isner

Federer, whose only defeat by an American at the US Open came in 2001 against Andre Agassi, hit 55 winners


“John has one of the best serves in the game, especially the pace on his second serve, which is unreal,” said Federer.
“I guess you’ve got to hang around and make sure you don’t drop your own serve.”
The 34-year-old, chasing an 18th major title, goes on to face Gasquet, who beat Czech Tomas Berdych 6-2 3-6 6-4 6-1.