1 Muhammad Ali 1960 - 1981 56-5-0

2 Joe Louis 1934 - 1951 69-3-0

3 Rocky Marciano 1947 - 1955 49-0-0

4 Ezzard Charles 1940 - 1959 89-25-1

5 Floyd Patterson 1952 - 1972 55-8-1

6 Jimmy Bivins 1940 - 1955 86-25-1

7 Sonny Liston 1953 - 1970 50-4-0

8 Gene Tunney 1915 - 1928 83-1-3

9 Larry Holmes 1973 - 2002 69-6-0

10 19 Mike Tyson 1985 - 2005 50-6-0