Three rounds ! A hypothetical match up with a twist E light heavyweight. The Clay of Rome versus the Spinks of Montreal. I give it to young Cassius. His speed would be the deciding factor,plus his vast amateur experience.
Leon was the least skilled member of the 1976 US Olympic Squad. Heart and hard charging determination were tremendous assets against a deadly opponent like Sixto Soria, but young Clay is an entirely different kettle of fish. Leon could put him on the deck, but this is amateur boxing, where a knockdown doesn't count for so much. At the end of three (and this one would go the full three) Clay would secure a unanimous verdict.
I was under the impression this wasn't amateur boxing, so if Leon did put him on the deck, which I don't think he would, he'd likely win the fight. Regardless, I think Clay wins either an amateur or a professional fight..too much speed.
Stevie said three rounds, with Montreal Leon against Rome Clay. As SG did not specify otherwise, I inferred an amateur rule set. Leon was older and more physically mature in Montreal than Clay was in 1960. Young Cassius had compromised punch resistance right up through the first match with Cooper in late 1963, after which he evolved into a much stronger specimen. But if 1976 Leon manages to nail the youthful Clay, he can easily produce a flooring. Even so, I don't see Leon managing better than a draw under professional ten point must scoring.
Clay would edge Spinks.Leon had almost 200 fights, and was the national champ for three years running.That would help make it a close fight.