John McEnroe believes that the praise Murray got from fellow players after his Berrettini win is the ultimate sign of respect and it's something important for Murray.
The British player made a comeback to tennis against all odds and what he's been doing since then is incredible. His win over Berrettini was certainly his best after coming back from hip surgery which speaks volumes at the amount of work he put in to be able to be in that position. It's why the support for Murray after the win was so huge.
McEnroe talked about it on Eurosport:
“Athletes more than anyone else appreciate that ability to hang in there and bounce back. You see all the injuries that he's gone through, the turmoil that goes on in your head when things aren't going right with your body. They understand what it takes to put yourself through something like that and lay yourself on the line."
He continued:
“So that's to me the ultimate respect, because they know a lot of what he's going through and has been through, and I think they appreciate the effort that it takes to even get out there and compete at that level. In some ways it becomes not about the result, it just becomes about what he's representing, the example that he's setting for other tennis players, even other athletes. So that's a testament to him, but he's long been regarded with a lot of respect in our sport."