Most folks have him between 6 to 15. I can put him there. MY all-time list, and you can shit on it if you wish:

1. Ali
2. Louis
3. Jack Johnson
4. Larry Holmes
5. Mike Tyson
6. Lennox Lewis
7. Evander Holyfield
8. Jack Dempsey
9. VITALI Klitchsko
10. Wladimir Klitschko

I always have and always will place Vitali over Wladimir. That's just me. I sincerely believe that in the respective guys prime, all of them, would beat Wladimir- from Ali to Tyson to his own brother.