Danny Williams regained the British heavyweight crown with a ninth-round knockout of Scott Gammer in Neath.
Williams (left) had too much class for Gammer
Gammer started brightly, but a lean Williams began to show his class in the middle rounds, a big right hand wobbling the Welshman in the seventh.
Gammer hurt Williams with two left hooks in round eight before Williams hit back with a huge right in the next.
The champion struggled to his feet on the count of 10, but the referee decided to wave the bout off.
Williams, 33, had shrunk himself down to 16st 4lb for what he fully admitted was a must-win fight, the lightest he had been since his professional debut in 1995.
Defeat to Matt Skelton in Cardiff last year - when he was more than four stones heavier - and a loss to Audley Harrison suggested he was nearing the end.
I'll analyse the tape and if I think there is not much more I can do, that's it for Danny Williams
But the unpredictable Williams was always going to be a step up in class for the Pembroke Dockman, who claimed the vacant title from Mark Krence last year.
After a positive start, during which Gammer landed with some solid right hands, the home favourite went into his shell in the middle rounds.
The Brixton man worked much better behind a snappy left jab in the sixth and was a clear winner of the seventh, which he rounded off by jolting Gammer for the first time with huge right hand.
Gammer responded with his best round of the fight so far in the eighth, stopping Williams in his tracks with a volley of unanswered left hooks.
But Williams stormed out of his corner for the ninth, trapping Gammer on the ropes before unleashing a sustained series of blows which ultimately left Gammer out for the count.
Afterwards, and in spite of regaining the Lonsdale belt, Williams claimed the fight may have been his last.
"It was a very satisfying victory - I proved everybody wrong," said Williams.
"But my performance was not that great. I'll go home and analyse the tape and if I think there is not much more I can do, that's it for Danny Williams.
"In a few days I'll make up my mind see if there is much left I can do and if not, I'm off."
Williams, who defeated Mike Tyson in 2004, also revealed he had trained himself for the fight
"I trained myself. [Lennox Lewis' former conditioner] Joey Dunbar gave me a programme on a piece of paper. But I've done all the training myself."