Novak Djokovic saw off Britain’s Andy Murray in a gripping late-night contest to reach the US Open semi-finals.
The world number one came through 7-6 (7-1) 6-7 (1-7) 6-2 6-4 in a match that lasted three hours and 32 minutes, and finished at 01:17 local time (06:17 BST).
Djokovic will play Japanese 10th seed Kei Nishikori in the last four on Friday.
Murray could take encouragement from his best performance since beating Djokovic to win Wimbledon last year, but the Serb proved relentless in their 21st meeting.
Defeat means that Murray has failed to get past the semi-finals of any tournament after undergoing back surgery in September 2013.
I played well,” said Murray. “Especially the first couple of sets was some good tennis.
“I played a poor tie-break in the first set definitely. I was down in the first set and I fought back. I was down in the second set and a break and I fought back.
“So I fought hard, I played some good tennis, but it wasn’t enough.”
The pair extended each other to the limit once again, and repeatedly had the 22,000 spectators in Arthur Ashe Stadium on their feet as brutal rallies were followed by roars of delight.
In a contest of numerous opportunities, it was the more clinical Djokovic who prevailed, winning seven of 10 break points while Murray converted just four of 16.