But the contest was suddenly ended when Dimitrov suffered a pectoral injury in the fifth game of the third set and had to retire.
The roof on Centre Court had been closed after the second set, causing a 13-minute delay.
“But Grigor actually, after the match, was (saying he was) liking when the roof went on, because he actually felt it got a little bit warmer in there, and his body loosened up a little bit more, even more than it was.
“I guess it’s a separate question whether it should have been closed or not. I mean, I don’t think it made a difference in his actual injury.
“But it should be an outdoor tournament and you should play outdoors for as long as possible – I don’t disagree with that.”
Two-time Wimbledon champion Murray had been critical of the decision to close the roof at around 8.30pm.
“So ridiculous to close the roof at this stage of the match,” wrote Murray on X.
“At least an hour of light left… well over a set of tennis can still be played… it’s an outdoor tournament!”
Dimitrov’s retirement was his fifth in a row at Grand Slam tournaments. The 34-year-old looked close to tears on court and was consoled by Sinner as he made his way into the locker room.
Delgado said that Dimitrov was “completely gutted, disappointed, heartbroken” and that it will be “emotionally” challenging to bounce back.
“The work that he’s put in to get to this stage and play in these kinds of matches against someone like Sinner, and Wimbledon’s his favourite tournament,” added Dimitrov.
“He’s of course had a bit of misfortune in pulling out of the previous Grand Slams, but he was playing so well – tactically perfect, he was obviously executing it to perfection.
“It was one of the matches of his career, and as a team, of course we thought he could push on and win that match, and who knows what goes on in this tournament? But it was a huge sadness today for us.
“I think emotionally will be just as hard. It’s getting harder to pick yourself up from those lows… It’s gonna be tough, the next couple of months.
“We’re waiting for results on his injury to see how bad that is, but it’s gonna be a few weeks out for sure.”
Sinner was also injured early in the match when he slipped and fell on his elbow. He is set for an MRI on Tuesday and is due to face Ben Shelton in the quarter-finals on Wednesday.
“It didn’t seem a tough one, but I still felt it quite a lot, especially serve and forehand,” said Sinner.
“I could feel it. So let’s see. (On Tuesday) we are going to check to see how it is, and then we see.”
