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.
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