The following list gives credit to "The Man Who Beat The Man." Comments can be sent to the Research Editors.

• Jack McAuliffe (1886-1893; Retired undefeated)
• George "Kid" Lavigne (1896-1899)
• Frank Erne (1899-1902)
• Joe Gans (1902-1904; Vacated title)
• Jimmy Britt (1904-1905)
• Battling Nelson (1905-1906)
• Joe Gans (1906-1908)
• Battling Nelson (1908-1910)
• Ad Wolgast (1910-1912)
• Willie Ritchie (1912-1914)
• Freddie Welsh (1914-1917)
• Benny Leonard (1917 to 1/15/1925; Retired)
• Jimmy Goodrich (1925)
• Rocky Kansas (1925-1926)
• Sammy Mandell (1926-1930)
• Al Singer (1930)
• Tony Canzoneri(1930-1933)
• Barney Ross (1933; Relinquished title)
• Tony Canzoneri(1935-1936)
• Lou Ambers (1936-1938)
• Henry Armstrong (1938-1939)
• Lou Ambers (1939-1940)
• Lew Jenkins (1940-1941)
• Sammy Angott (1941-1942; Vacated title November 13)

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  1942-1947: After Angott retired, the title was claimed by Beau Jack, Bob Montgomery, Angott , upon his return, and Juan Zurita. Williams kayoed Zurita in 1945 and Montgomery in 1947 to unify the crown

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• Ike Williams (1947-1951)
• Jimmy Carter (1951-1952)
• Lauro Salas (1952)
• Jimmy Carter (1952-1954)
• Paddy De Marco (1954)
• Jimmy Carter (1954-1955)
• Wallace "Bud" Smith (1955-1956)
• Joe Brown (1956-1962)
• Carlos Ortiz (1962-1965)
• Ismael Laguna (1965)
• Carlos Ortiz (1965-1968)
• Carlos Teo Cruz (1968-1969)
• Mando Ramos (1969-1970)
• Ismael Laguna (1970)
• Ken Buchanan (1970-1972)
• Roberto Duran (1972-1979; Vacated)
• Alexis Arguello (1981-1982)
• Julio Cesar Chavez (1987-1989; Vacated)
• Pernell Whitaker (1992; Vacated)
• Floyd Mayweather Jr. (2002-2004; From first Castillo win)
• Jose Luis Castillo (2004-2005; From Lazcano when they were clearly #1 and #2 in class)
• Diego Corrales (2005-06)
• Joel Casamayor (2006-08)
• Juan Manuel Marquez (2008-12; Vacated)
• Terence Crawford (2014-2015; Vacated)

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