Aside from Liston, two fighters come to mind for a very specific reason. Old Foreman really struggled with movement. We watched Tommy Morrison on his bike pecking away with success as well as Axel Schulz a few years later. Two guys from the 50's that had excellent boxing skills and discipline to pull off a decision win were Ezzard Charles and Eddie Machen. I could see them not letting Formean set his feet and winning on points but I will stop short of saying it's a sure thing. Machen outpointed a lot of big punchers but Ingo certainly found his chin.
The only sure bet here is Liston, hands down. Everybody else is just a guess. Maybe Machen, Charles or Nino Valdes, even Archie Moore could pull a win, but I am not confident at all on them. They would need to stay away from Foreman, outboxing and dancing around the whole fight. One mistake and they end doing the "Michael Moorer's special cha cha"
Ezzard Charles could probably do something similar to Jimmy young . Rock might drop a big fight in a shoot out.
If anyone thinks a 185 pound 5'10 67 inch Marciano can come forward vs a 250 pound man mountain like Foreman who's as strong as an ox they need their head testing. I agree with @AwardedSteak863 tricky fighters with movement would be the ones to trouble Foreman.
Well some will certainly need their heads testing on here, mate. I respect the hell out of the Rock. What he did and accomplished. But even against apast prime, Foreman, he's gonna get hurt. George was a beast let's be honest.
not sure if he had a fight in the 50s, think he did 50/51, anyway a PRIME Big Joe Baksi might give Foreman a good tango, though Big George would still win it.
He'd get pulverised and that's no disrespect to Marciano but it's totally different eras. If Marciano was in modern era he'd mostly likely be a Light Heavyweight or Cruiserweight. I respect Marciano and he was great for his time but his style and size do not translate well to the more modern era vs bigger stronger Heavyweights who Marciano wouldn't be able to grind down.