Oooo thats a good what if.... maybe a rematch with Archie Moore. The only other few I can think of around then he didnt beat up already were Patterson, Liston, Johanssen, Zora Folley, and maybe Maxim. I think he would have beat them all because they were pretty young at that time Liston and Pattersone would have given him good fights. Imagine the bombs in Marciano Vs. Liston, thats a hard fight to pick theyre both brawlers with that one shot power.