Often regarded as one of the greatest boxers of all time, he competed from 1977 to 1997, winning world titles in five weight divisions; the lineal championship in three weight divisions; as well as the undisputed welterweight title.
Habitualmente considerado un dos grandes boxeadores de todos os tempos, competiu entre 1977 e 1997, gañando títulos mundiais e cinco categorías, o campionato lineal en tres categorías, e o título en peso wélter sen disputar.