Here is my top 15 list:
1. Manny Pacquaio
2. Muhammad Ali
3. Jack Dempsey 4. Oscar De La Hoya 5. Rocky Marciano 6. James Toney 7. Jack Johnson
8. Gene Tunney
9. Lennox Lewis
10. Vitali Klitschko
11. Harry Greb 12. Primo Carnera 13. Roy Jones Jr. 14. Mike Tyson 15. Julio Cesar Chavez
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