Lamar Clark 44 1958-1960 BoxRec has 43
*Billy Fox 43 1943-1947 BoxRec has 36
*Don Steele 42 1994-1997 BoxRec has 41 if you don't count the NC bout in his 3rd bout
*George Gunther 41 1899-1905 BoxRec doesn't agree
*Rodolfo Gonzalez 35 1959-1961
Wilfredo Gomez 32 1974-1981
Jimmy Adamick 32 1936-1937
*Jose Manuel Urtain 30 1968-1970
*Acelino Freitas 29 1995-2001
*Alfonso Zamora 29 1973-1977
Jesus Pimentel 28 1961-1964
Carlos Zarate 28 1974-1978
*Dr. Vitali Klitschko 27 1996-2000
Henry Armstrong 27 1937-1938
Dario Azuaga 27 1994-1997
Earnie Shavers 27 1970-1972
Miguel Julio 27 1990-1995
* Denotes from the start of career
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Legendary LightHeavyweight Champ Archie Moore with 131 recorded KO's from 185 fights and a total of 220 fights according to
Edwin Valero = 100% knockout ratio 25 wins, no defeat, all 25 by KO. 19 of which in round 1