George Groves was halted in the 8th round of his IBF and WBA world title bid at Wembley Stadium on Saturday night.
A bitter feud had simmered beforehand, but the rivals stayed composed in a tactical second fight, despite an 80,000 audience, and Groves appeared to have a foothold before being stopped by a right hand in the 8th round.
Despite the ill feelings between the fighters in the build-up to both contests, Froch was quick to praise the boxing abilities of Groves.
"I've been in with some of the best fighters in the world, and it was neck and neck in there," Froch toldSky Sports Box Office.
"There was nothing in it, it was a close fight. It was a stand-off, tactical fight and sometimes in professional boxing it only takes one punch.
"And when you've got the punch that I've got it just shows that one punch can be all the difference and all it needs.
"Unfortunately for George he was on the end of a very heavy right hand from a seasoned champion. But we've both done ourselves proud tonight."
And Groves gave credit to his opponent:
"I left the target open and Carl, to his credit, took full advantage of that”, Groves told Sky Sports.
"I felt like the fight was in my favour. I was performing very well. I'll have to go and watch it again but it seemed like one of those cliché things in boxing - a split second mistake.
"But I'll come back better, fitter and stronger, and there is no doubt I will be world champion sooner rather than later.
"It's just one of those punches. It's a shame it happened now - I've spent my whole career where this could've happened and hasn't, and it's happened to me at the worst possible time.
"There's certainly a value still with me, and there's a lot more potential. We're improving fight on fight. I got careless for a second and I paid the price - it's a brutal price you pay in boxing, but there are a lot of positives.
"I've still got a long, successful career in front of me."