Rocky Marciano v Jersey Joe Walcott I, Round I

Ali vs Marciano would be a close fight, I would not used the Walcott fight has a sole judge on this dream match up. Walcott and Ali's syles are like night and day.

Walcott was mostly a counter puncher, He did not out box Marciano in that fight, he relie on slugging it out, and counter punching. He was not on his toes popping out the jab here, he relly went after the Rock. And when he could not blast Marciano out early, he went with counter punching Marciano though out the fight.
Ali would have used his bike vs Marciano. I think Marciano would have got by the jab, and bang to the body imo. Close fight, that could go either way.