Nicknamed "Iron Mike" and "Kid Dynamite" in his early career, then later known as "The Baddest Man on the Planet". He reigned as the undisputed world heavyweight champion from 1987 to 1990. Claiming his first belt at 20 years, four months, and 22 days old, Tyson holds the record as the youngest boxer ever to win a heavyweight title. He was the first heavyweight boxer to simultaneously hold the WBA, WBC and IBF titles, as well as the only heavyweight to unify them in succession. Mike Tyson is considered to be one of the greatest heavyweight boxers of all time.