Enzo Maccarinelli v David Haye, BBC Radio Wales, Radio 5 Live and BBC Sport website, Sunday 9 March, approx 0130 GMT
The all-British rivalry has been compared to Benn v Eubank
Enzo Calzaghe says Enzo Maccarinelli can end David Haye's career in Saturday's cruiserweight unification clash at London's O2 Arena.
"Haye has been foolish in choosing this fight," coach Calzaghe told the BBC's Sport Wales TV show. "He'll not just get beaten, he'll get battered.
"His only, single hope is a sucker punch, everyone can get lucky with one.
"But I hope he drops early, for his sake. If it's longer it'll be slaughter and I don't think Haye will box again."
Londoner Haye holds the WBA and WBC titles while Welshman Maccarinelli is the WBO champion.
Both fighters have formidable knockout records, with all but one of Haye's wins coming by stoppage and Maccarinelli having ended 21 of his 28 victories early.
But the single reversals suffered by each fighter also came by way of knockout and each has been wobbled on other occasions, seeming to guarantee an explosive showdown at the old Millennium Dome.
"People think it will be a war, a clash between two reigning champions from this country hasn't happened since Nigel Benn v Chris Eubank in 1993," 27-year-old Haye told Sport Wales.
I'm the better all-round athlete, I'd beat Maccarinelli at any sport
"People expect the same sort of fireworks and will get them, I'll be coming out with all guns blazing.
"We're both tougher than people give us credit for but I'm the better all-round athlete, I'd beat Maccarinelli at any sport.
"I've got the superior timing and reflexes, more power and superior endurance.
"My only defeat [against Carl Thompson] came because I ran out of energy and my corner threw in the towel, he was knocked out by Lee Swaby - the ultimate in boxing bums who has done nothing else.
"I'm going to throw bombs from the start and as soon as I land he's going over."
Maccarinelli is not the favourite on Saturday but the 27-year-old giant trains in the perfect gym for overlooked champions.
Senior stablemate Joe Calzaghe needed the best part of ten years to be shown universal respect.
Now the unbeaten southpaw is undisputed super-middleweight king, the superlatives are free-flowing.
Enzo Calzaghe, the trainer that transforms underdogs into top dogs in his Welsh Valleys fight club, is the man Macca would want more than any other in his corner.
Calzaghe snr's tactical strategies and motivational techniques coupled with his demand for supreme fitness is ideal for a prize-fighter with a point to prove.
And doesn't Big Macc know it.
I'm a winner, I don't even let the kids at home beat me on the Nintendo
"On paper it's 50-50, and Haye knows how dangerous this fight is, whatever he says," the Swansea showman told Sport Wales.
"People have written me off and I'm going to be in his hometown, but I can't tell you how motivated I am for this one.
"He loves the limelight and has been in Miami training in the sun, but I've been in the Calzaghe gym in Newbridge where we have to work hard just to keep warm.
"I'm a winner, I don't even let the kids at home beat me on the Nintendo.
"I'm only looking at this fight, but the victory will open up so much for me.
"Look at Joe Calzaghe - because of politics he had to struggle all his career to get a unification bout, I've got that opportunity at the age of 27."
*See the full big-fight build-up on Sport Wales, BBC Two Wales & 2W, on Thursday, 6 March (2200 GMT)