Undefeated 2 Weight World Champion 21 defences 46/0
Calzaghe is the longest-reigning super-middleweight world champion in boxing history to date, having held the WBO title for over 10 years and making 21 successful defences (the most in super-middleweight history) before moving up to light-heavyweight. As his super-middleweight and light-heavyweight reigns overlapped, he retired with the longest continual time as world champion of any active fighter. He was also the first boxer to unify three of the four major world titles (WBA, WBC, and WBO) at super-middleweight.