Andy Murray has beaten John Isner to book his place in the last 4 at Flushing Meadows.
The British number one saw off the tall American 7-5, 6-4, 3-6, 7-6 (7-2).
Murray is only the 7th man to reach the semi-finals at all 4 grand slams in a single year.
The world number 4, who follows in the footsteps of Rod Laver, Tony Roche,
Ivan Lendl, Roger Federer, Rafael Nadal and Novak Djokovic, looked to have Isner
in his pocket at 2 sets up but the 28th seed hit back.
Isner played superb tennis and won the 3rd set with his 13th ace.
The American received treatment for an ankle problem before the start of the 4th and forced a tie-break.
But it was Murray who came out on top after a double fault from his opponent.
The British number 1 said he was pleased with his performance: "I played great today, pretty much throughout the match. But he started serving very, very well. Most sets came down to a few points here and there.
"I played really well, especially in the fourth-set tie break. I served well and I'm glad to get through."