With 17 weight classes in boxing and four major sanctioning bodies that bestow world titles, keeping track of who holds each of the belts can ... Parker is the WBO heavyweight interim champion ...

George Foreman became the heavyweight champion of the world in his 20s, only to lose his belt to Muhammad Ali ... the oldest man to win the heavyweight championship, throwing one perfect ...

An undisputed world heavyweight championship bout with Britain's Daniel ... He had to vacate the IBF heavyweight belt to take his December rematch with Tyson Fury. The Ukrainian won that second ...

However, this also means that other than championship belts, the World Heavyweight Champion hasn’t had any personal feuds on the roster. While he is the leader of The Imperium, The Ring General ...