7. Roberto Duran
Roberto Duran boxed professionally in five different decades and became world champion in four weight classes from lightweight to light heavyweight, and it is worth considering that by today's standards, Duran moved up not three, but six weight classes.

Duran is remembered not only for his athletic longevity, but also for his spectacular attacking style, which earned him the nickname "Stone Fists" [Manos de Piedra]. In addition, Duran fought at the same time and in the same weight class with other outstanding boxers, and his fights against Sugar Ray Leonard, Thomas Hearns and Marvin Hagler went down in boxing history.

He is the only person in history to win the Comeback of the Year award. In March of this year, Duran underwent heart surgery, and a month later he participated in the announcement of the fight for the title of absolute world champion.