WBC, WBA, IBF, WBO, IBO, WBU, IBA, WBF, NABO. Super champion, diamond champion, interim champion, champion in recess. Continental Americas champion, FECARBox champion, European Union Champion.
There are so many champions and layers of champions in boxing today that it's easy to see how even those of us who follow the sport closely can get lost. With sanctioning bodies often finding ways to have three men hold the same belt, it's become hard to take championships seriously. Few boxers win a belt and hold it for the long term.
That's not true for the 10 men who have made this list as the longest reigning champions in the sport today.