My top 20 (in no particular order) - Muhammad Ali, Joe Louis (both heavyweight), Roy Jones Jr, Archie Moore (both light heavyweight), Joe Calzaghe (super middleweight), Sugar Ray Robinson, Carlos Monzon, Marvin Hagler (all 3 middleweight), Sugar Ray Leonard, Henry Armstrong, Emile Griffith, Oscar De La Hoya (all 4 welterweight), Julio Cesar Chavez (light welterweight), Benny Leonard, Roberto Duran (both lightweight), Azumah Nelson (super featherweight), Willie Pep, Eusebio Pedroza (both featherweight), Jimmy Wilde (flyweight), and Ricardo Lopez (strawweight).
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