I know Marciano was undefeated, but to me that only means so much considering who he fought and all the top name guys he fought were far from their prime and pretty much washed up by the time the rock fought them. Marciano would never of become the champion in the 70's. Multiple guys would of beaten him in my opinion.

Marciano and Frazier would of been a real good fight to see. Two smaller heavyweights and both were sluggers.