Joe Calzaghe has given his clearest indication yet that he is ready to quit after extending his unbeaten run to 46 with a points win over Roy Jones Jr.
The Welsh fighter told BBC Sport: "So much rested on this fight and and I did not want to fail at the final hurdle.
"I've been undefeated for 18 years and (it's) probably my last fight. I am not going to make any announcements at the moment, but (I'll) probably (retire).
"I'm going to take a good break with the family and evaluate the situation."
Calzaghe, who had a night of celebration and no sleep after defeating Jones, also laughed off suggestions he may be tempted by a rematch with Bernhard Hopkins.
He said: "The first fight was boring, all he did was hold. He's a boring fighter and I've beaten him once, why would I want to fight him again - he had his chance he failed.
It was a fairytale fight and a fairytale ending
""I've beaten all the top fighters and I stepped up to light heavyweight and beat two American legends in America."
There had also been suggestions Calzaghe would fight Jones again in Cardiff and he added: "I don't like to do rematches but I'll have to go away and evaluate."
Calzaghe's father Enzo warned that anyone wanting to fight his son needed to make a big offer quickly.
"I hope the offers come now, then he doesn't have to retire. Once he's retired and they come with the offers it's no good," said Enzo.
In the lead up to the Jones fight, Calzaghe had been adamant that this would be his last fight, but the nature of his victory, and his new-found popularity in the US, may convince the Newbridge southpaw to change his mind.
Calzaghe recorded an emphatic unanimous points victory over his opponent, with what will go down as one of his greatest performances.
Earlier this year he defeated Bernard Hopkins in Las Vegas and the US fighter is among a small list of potential rematches for Calzaghe if he chooses to box on.
Calzaghe celebrates after his victory at Madison Square Garden
Other possible rematches include Mikkel Kessler, who he beat in 2007, or Jones himself.
Both Kessler and Hopkins were ringside and have made no secret of their desire to fight Calzaghe again.
Chad Dawson was also suggested as another potential opponent for the 36-year-old Welshman who admitted the Jones victory would make a fitting finale to a glittering career.
"I am so happy with what I have achieved this year but I'll see what happens," said Calzaghe of his future plans.
"It was a fairytale fight and a fairytale ending. I've had problems with my hands for years and years but I was able to train good for this fight.
"I've belief in my punching power and I felt I grew into the weight (for the light-heavyweight division) much better for this fight than I did for the Hopkins fight and I felt stronger.
"I knew I had to make Roy Jones respect my punches and I felt I did. I think I stunned him on a few occasions, so I was happy with it."
As in his bout with Hopkins, Calzaghe was floored in the opening round, this time by a jolting straight left from 39-year-old Jones that momentarily stunned his travelling fans who formed roughly half of the 14,152 fans at Madison Square Garden.
The Welshman described that moment as "deja vu, man", but he came came back to wear down the American, causing a damaging cut above the former four-division champion's left eye in the seventh round that Jones' corner could not staunch.
Jones went to hospital shortly after the fight to be stitched and did not appear at the post-fight press conference.
Calzaghe Sr expects Joe to retire
Calzaghe added: "It (being knocked down) was not in the script but I think I showed what a true champion is all about, by coming back."
Calzaghe's father revealed the boxer's mum was desperate for her son to retire, but added the family would support him whatever his decision.
"His mum is begging him to retire and he has nothing more to achieve," added Enzo.
"Whatever he wants to do, I'll back him. If he doesn't want to box, he gets my blessing because there's no more to achieve.
"But if he wants to carry on boxing, keep boxing now, don't retire. Once he's retired there's no coming back, I don't want him coming back.
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