Here's where everyone differs.. I'm sure mine's as disagreeable as the next.. I think everyone has a hidden bias on who they were brought up with or who they've seen the most of over the years.. Some fighters that are low on my list, will end up high on others, & visa versa.. I like to think my list is based on, if they all fought each other 3 times, where they'd end up on a points system.. Prime 4 Prime of course.. 1. Joe Louis 2. Muhammad Ali 3. Larry Holmes 4. Lennox Lewis 5. Mike Tyson 6. Evander Holyfield 7. George Foreman 8. Joe Frazier 9. Rocky Marciano 10. Sonny Liston 11. Jack Dempsey 12. Riddick Bowe 13. Jack Johnson 14. Ken Norton 15. Ray Mercer 16. Jim Jeffries 17. Gene Tunney 18. Ezzard Charles 19. Joe Walcott 20. Floyd Patterson I have only included fighters who held a version of the world title.. I know there were guys who didn't get there shot, who could have been there, ie Langford, Jackson, Wills, McVey, etc, who can come on a later thread.. I'm also aware that Ken Norton was awarded the WBC strap when Leon Spinks was stripped, but I think it's fair to say, he's there on merit..