Watch this excellent YouTube clip on some monster knockout heavyweights in their prime.
What I like about this is that it includes fighters from the early days of film and television, including Rocky Marciano, Jack Dempsey, Joe Louis, and Sonny Liston. Along with the more current crop, I think that's a pretty good list. Who do you think hit the hardest? Comments on the post are turned off. Head over to the Convocation of Combat Arts forum and put in your two cents!
