Three giants in the ring and two of the funniest people who've ever lived in Muhammad Ali and George Foreman. Without Parkinson's, imagine Big George and Muhammad, doing a two-man comedy routine and show together. Muhammad, going off on all his opponents that he beat and George telling people how fat people can succeed in America. Or at least people with big mouths and appetites. Joe Frazier, not exactly known for humor, but I don't know of a better heavyweight champion who was under 6'0 at least since the 1960s who was better. He's definitely one of the best 5-10 heavyweight champions of all-time. Even though his time as a world champion or even world championship contender was over by his early thirties.
Unless you want to put Larry Holmes in this group who didn't become the World Heavyweight Champion until 1978, I believe we're talking about the three best heavyweight boxers of the 1970s. Muhammad, won the World Heavyweight Championship twice and was 3-1 against these other two great boxers. Joe Frazier, was World Heavyweight Champion for what, five years. And it took someone as big and strong as a George Foreman to beat. And George beat him twice and George also beat Kenny Norton and some other great boxers. And you could even argue that George underachieved in the 1970s and perhaps should have accomplished more. So this is a great group that was on TV together.