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Murray held serve to tie it at 5, then had a triple break opportunity in the next game. Fish escaped with the help of an ace, then wasted a couple break points of his own, sending it to the tiebreaker.

At that point, Murray was starting to show the strain, grabbing the back of his legs and bending over to stretch them after chasing down a shot.

He overcame a set point during the tiebreaker, took it to 8-7, then appeared to end it by returning Fish’s second serve down the line. Fish thought the shot was on the line, but challenged the call anyway while approaching the net to shake hands.

The replay showed the ball was barely out. The tiebreaker was all even at 8.

“I was lucky,” Fish said. “I was really surprised.”

Two points later, it was finally done.

After only one set, Djokovic’s match was over.

Berdych hurt his right shoulder while reaching for a ball during his quarterfinal win over Roger Federer. He wasn’t sure if he’d be able to play against Djokovic, who is 57-1 this season and unbeaten on hard courts.

Berdych, who hasn’t reached a final since Wimbledon last year, broke Djokovic and led 5-4 in the first set. He double-faulted to even the match — a sign the shoulder was becoming a problem — and Djokovic broke him again to win the set 7-5. That’s when Berdych withdrew.

“In the beginning, it was so-so and I was able to hit a few balls,” he said. “But when the match was going more and more, it was just worse and worse. There was no chance to serve.”