Enzo Calzaghe insists his son Joe will sign off with a perfect record when he faces Roy Jones Jr at Madison Square Garden in his final fight tomorrow night.

Joe Calzaghe will bring the curtain down on a so-far unbeaten 45-bout career after he fights former eight-time, four-weight champion Jones at light-heavyweight in New York.

Father and trainer Enzo said: "The road has been long, and we're getting to the final hurdle. He will not, under any circumstances, fail on the last hurdle. As long as Joe turns up as Joe Calzaghe at the top of his game, I've got no problems."

Calzaghe senior believes his son's determination to finish his career without defeat could make the difference.

"As far as Joe is concerned, he's after one thing only. He wants to retire undefeated. That's the key, the passion, his goal to be undefeated.

"It's the dream he's always had. That - when push comes to shove, concerning characters, hearts and souls - is what will be scrutinised in this fight.

"Roy's a great fighter; I've nothing bad to say about him. He's a guy I've admired for 10 years; he's 'walked the walk and talked the talk'; he's done it. But I will question only one thing.

"When it hits the fan, when his heart is going to be searched and his mind questioned, will he come up short? I think against Joe Calzaghe he will.

"He's the same class as Joe. But will he find that extra bit of zest, that extra bit of passion, that goal that's in front of him to say 'I will not be defeated, I will go down 10 times but I'll get up'."

Jones has a 53-4 record and Calzaghe senior cited the American's consecutive knockout defeats in 2004 to Antonio Tarver and Glen Johnson as evidence to back up his argument.

"Glen Johnson's a great fighter. But he was a middleweight. Tarver hasn't set the world alight. It wasn't a flash knockdown - he was absolutely put to sleep. To me that means either he's got a weak chin or weak resilience - and deep down, in his own heart, he'll know what he's made of."

Enzo is confident Jones will not be able to come up with a strategy to beat his son, just as Bernard Hopkins failed to do in his fight with the Welshman last April.

"Joe's very hard to fight against - so what plan do you make for him?" he asks.

"What Joe will turn up on Saturday? I don't even know myself. Will it be the brawler; will it be the master-class man which he showed with (Jeff) Lacy? Will it be the charismatic guy? I don't know.

"Plan A, plan B, plan C can be operated by Joe Calzaghe - no problem."