Does anyone under 140lbs beat Duran? Or are they just too vicious and strong for someone that small to elude.
Cruiserweight Usyk would beat both of them (Frazier and Marciano) IMO, although I think there are other contenders.
Usyk struggled against Chisora's pressure and had a close competitive fight vs Breidis who was a pressure fighter, a swarmer like Frazier runs Usyk out of the ring who hasn't got the power to deter him.
Frazier breaks down Usyk and stops him. I have no doubt. But I think Usyk turns the trick on Marciano and gets a decision.
Beterbiev would be interesting as would Bivol with his great boxing skill, but there's no one that comes across to me as "yes, he'd beat them". But in the end, who knows. I'm glad when I'm correct when predicting fights that actually happen.
Jack Dempsey was the first name that sprang to mind. He flew out of the traps and these two were both notorious as slow starters.
There's a lot of guys that 'might' or 'could' do it on a hypothetical basis but I'm not sure if I'd put money on the result. Today I think dudes like cruiser Usyk and Beterbiev who is bursting at the seams at 175, might do it. Bivol would be interesting to see - over a short stretch I might favour him but over a long 12 rounder probably not. There's other guys that might do it over a shorter distance too. Dempsey is a natural pick.