Originally Posted by R_7-Ronaldo

1. Ali
2. Joe Louis
3. Marciano
4. Foreman
5. Robinson
6. Larry Holmes
7. Joe Frazier
8. Sonny Liston
9. Mike Tyson(last boxer to unify belts)
10. Evander Holyfield

Honorable mentions to Lennox Lewis,. Jack Dempsey, Jack Johnson, Hasim Rahman