This is quite interesting - not relevant to teh criteria of this thread, but anyway....

Heavyweight Fighter of Century as chosen by a five-member panel for The Associated Press in 1999:

1. Muhammad Ali, 56-5, 37 KO's; Career: 1960-81, 19 years active.
2. Joe Louis, 68-3, 54 KO's; Career: 1934-51, 14 years active.
3. Rocky Marciano, 49-0, 43 KO's; Career: 1947-55, 9 years active.
4. Jack Dempsey, 61-6-8, 50 KO's, 6 ND; Career: 1914-27, 11 years active.
5. Jack Johnson, 78-13-11, 49 KO's, 18 ND; Career: 1897-1938, 30 years active.
6 Larry Holmes, 67-6, 43 KO's; Career: 1973-99, 23 years active.
7. Sonny Liston, 50-4, 39 KO's; Career: 1953-70, 17 years active.
8. Joe Frazier, 32-4-1, 27 KO's; Career: 1965-81, 13 years active.
9. Sam Langford, 167-38-37, 117 KO's, 48 ND; Career: 1902-26, 25 years active.
10 Jersey Joe Walcott, 53-18-1, 33 KO's; Career: 1930-53, 20 years active.