I agree with you Jim Boogie, Ali's beating of Foreman was probably the only time a 'prime' heavyweight was defeated. However others could argue that Foreman hadn't fully developed his skills at that point becuase he was so used to knocking people out.

Ultimately it's a self fufilling prophecy, a fighter loses, there is ALWAYS a reason or excuse.

But imo Tyson was destoyed by Douglas in his prime. I mean how old was Tyson then? 26?

No way you could argue he was past it.