McIntosh has now won 13 of his 14 pro fights
Britain's Danny McIntosh claimed the vacant European light-heavyweight title by stopping home favourite Thierry Karl in Levallois-Perret, France.
Norwich's McIntosh was well behind on the scorecards and seemingly in danger of being stopped himself when he came up with a huge shot in the 10th round.
The 30-year-old told BBC Radio Norfolk: "I'm aching like anything, but it's absolutely brilliant.
"To win the title on his home turf, by knockout, I'm just so happy."
His 10th-round flurry left Karl out on his feet and prompted the referee's intervention.
McIntosh said that going to the judges' scorecards was not a gamble he was willing to take against a Frenchman in Paris.
"We set a game plan, we followed it, and it paid off. I knew I needed to knock him out to win," he said.
"People are saying the rounds were scruffy and he was just winning. I think I was doing well but if the rounds are that close they're going to give them to him.
"I needed to frustrate him a little, and it worked, he started getting annoyed, I needed to capitalise on that and I won."
McIntosh was given three weeks' notice of the fight, and admitted that he was far from in top condition when his manager informed him of the opportunity for his biggest fight yet.
"When John Ingle rang and said I had the fight I was really ill, I'd just got out of bed after having flu over Christmas," he said.
"I might have had swine flu to be honest, I was really, really ill, I was going to refuse the fight, but John told me: 'This chance isn't going to come around again any time soon.'
"So I bit the bullet, I went up there, and it paid off," he said.
It was a career-best win for McIntosh, who was stopped in a British title bid by Nathan Cleverly in 2009.