Eddie Hearn believes Kell Brook's conditioning will be the difference when he takes on Devon Alexander on February 23.
Brook's promoter is confident the 'Special One' will bring the IBF welterweight title back to Britain when he takes on the champion at the Detroit Masonic Center next month.
And he expects the sheer physicality of Brook to gradually tell on an opponent who appeared to quit when he faced a similar type of foe in Timothy Bradley in 2011.
"I think he has to hurt him, he has to be strong, powerful and patient," Hearn told Sky Sports. "He knows he's going to be much stronger than him, harder than him. But patience is important because he knows he's going to get hit.
"There's no doubt about that, but it's about taking your time, cutting him off and making sure you wear him down and physically manhandle him.
"I don't think Devon will be able to manhandle Kell, he'll be too strong. Look at the Bradley fight, that's the blueprint to beating Alexander - just out-bully him.
"I think if they're in clinches I think Kell will be too strong. Devon might want to have that fight on the inside but I really think Kell's strength is phenomenal for a welterweight."
Hearn dismissed talk of Alexander taking the Briton lightly in what is his first defence of the title he won against veteran Randall Bailey last year.
"Alexander has operated at a level well beyond Kell, so they might think it'll be a fairly easy night," he admitted. "But he'll be training as hard as Kell who is 29-0 - there's no blueprint to beating him.
"If they want to watch the Carson Jones fight, when Kell was 30 percent of what he is now, and think that's how they beat him, that would be fantastic for us.
"There are massive fights for him (Brook) out there but this is the one and I think that's why he won't be denied - he knows what's on the other side."
Hearn confessed one of those future fights he would love to make is with Amir Khan, although he doubted if the former light-welterweight champion will be ready this year.
"When Kell beats Devon Alexander Khan's not going to want to jump straight in with him, not at welterweight," he added. "You'll see on the night how strong he is. He punches so hard when he's on the weight.
"I don't think Khan's going to want a piece of it. If he moves up he can challenge him for the world title. But I think they'll match him carefully for now."Tags: Devon Alexander , Kell Brook , Eddie Hearn , Alexander-Brook , Alexander vs Brook