He beats most, maybe all, but the toughest fights would be- First choice has to be Holyfield at 6'2 1/2" with a 77 1/2" reach and 190-200 ripped Lbs. Qawi, Toney, and Adamek would be no walk in the park.
'07 Adamek... oh dear not that beast. Wouldn't favor anyone one of them against the Rock in a 15 rounder. Holyfield could nip a 12 rounder.
I've favor him against all with the exception of Holyfield. Qawi would be a barnburner. He'll likely produce some pretty violent stoppages along the way.
I'm by no means convinced that the 190 pound non-juice , 13 fight Holyfield even survives Marciano over 15 ... if Evander fought his career at cruiser and matured at cruiser I may like him but no way was he any sort of lock..
Cole was a very good CW. I think he had trouble making 190 but with a limit of 200 Lbs I think he would have done even better. Gomez was also a good CW. Can't forget about Haye. Even these guys would be tougher than expected- DeLeon, Ocasio, Norris, Czyz, Daniels, Washington, Bell, Mormeck, Cunningham, Jirov... and Bert Cooper just for the hell of it.
If Dempsey could not get Marciano out of there in the first 4 rounds he would get KOed. And I am a huge Dempsey fan.
Dempsey would get beat IMO. If we are counting HW greats at or under 200 Lbs... there are a lot, and Marciano would beat most. Johnson, Dempsey, Tunney, Walcott, Patterson, M. Spinks would all be tough but I think Marciano would beat them. Prime Louis and Charles is a tough call.
I think Marciano beat everyone in this group, there would be some wars vs Evander,Dempsey, and some interesting fights vs Tunney and Toney but Marciano prevails IMO
RJJ vs. Rocky Marciano at cruiserweight is a horrible fight for Jones. Marciano was a frustrating, ultra-tough, relentless and heavy hitting opponent- just what's needed to neutralise the skills, speed and pop of RJJ.