David Coldwell declared Tony Bellew's sensational win over David Haye as the best of his career.
The Sheffield trainer was behind an 11th-round retirement from his former employer, after the two-weight world champion was pummelled through the ropes by Bellew.
Everton fan Bellew won the WBC cruiserweight title at Goodison Park last summer but, after a bitter and at times personal war of words with Haye and his coach Shane McGuigan, Coldwell could not hide his delight at the outcome of Saturday's bout at The O2.
"That was the best fight of my career - the best," he told Sky Sports in a ringside interview.
"Goodison means more because of what it meant to Tony, but this was the best because of what it meant for me.
"Winning the world title at your favourite football club is unreal but because of the personal stuff they threw at me, this makes this so, so good."
Coldwell was labelled a "tee-shirt seller" and "Penfold" by Haye in the bitter build-up, but the trainer is happy to move on after a sensational win.
McGuigan also had a swipe at his opposite number at Friday's weigh-in but once he threw the towel in after 11 explosive rounds, the two camps seem to have ended their feud.
"All week, I didn't get personal, everything I said was factual," Coldwell added. "And as I said in the build-up, there is always an excuse for Haye and there was an excuse tonight.
"But that doesn't matter. David came over to shake my hand straight away and said 'well done'. I was so happy and now we can brush it all under the carpet."
Coldwell also hailed Bellew for sticking to the game plan to produce one of British boxing's biggest upsets.
Bellew was knocked down by Ilunga Makabu and admitted he had got carried away with the occasion when he beat BJ Flores last time out, but barely put a foot wrong on Saturday.
"The plan was not to get drawn into his traps and then to draw him in - and he did it," said Coldwell.
"He did everything I wanted him to do. When it did come to a fight - and it was always going to at some stage - I wanted him to go to the body and he did that.
"He did everything we'd been working on. I am so pleased. It means so much, it really does."