Ali - Foreman was definitely a great heavyweight beating a prime heavyweight. It's hard because anytime anyone loses, people are going to say that they weren't prime because the general feeling is that prime fighters just don't lose bouts. Some people say a fighter's prime last one bout, I think that's a peak not a prime.

But I definitely think the Frazier Ali beat was prime. The Foreman he beat was certainly prime.

Johnson had had the title for like 8 years before losing to Willard, and he was slow. He was good, but he wasn't prime. I'd say that the Tyson Buster beat was prime. We know Mike or his corner wasn't ready for a fight, but he was still considered unbeatable and had he knocked Buster out in that fight, we wouldn't have pointed to that as not being a prime Tyson.