HW Joe Louis
CW Evander Holyfield- not much competition
LHW Ezzard Charles
SMW Joe Calzaghe - not much competition
MW Marvin Hagler
LMW Tommy Hearns
WW Sugar Ray Robinson
LWW Julio Cesar Chavez
LW Roberto Duran
SFW Azumah Nelson
FW Salvador Sanchez
SBW Wilfredo Gomez
BW Eder Jofre
SFW Khosai Galaxy
FW Jimmy Wilde
LFW Carbajal
MinW Lopez

(IMO only, of course)