This is a Manny Pacquiao inspired question.
I only know of Roberto Duran who was a natural lightweight like Manny but he went on to beat guys at Middleweight and win titles there. I am also familiar with Jack Dempsey because most of my sparmates at the gym unintentionally do his Dempsey roll but of course they are not Jack Dempsey so it leaves me with the pleasure of counter-punching them to a beating . I know Mike Tyson and Rocky Marciano are small for heavyweights but they knock out the bigger guys anyway. So who else?
I only know of Roberto Duran who was a natural lightweight like Manny but he went on to beat guys at Middleweight and win titles there. I am also familiar with Jack Dempsey because most of my sparmates at the gym unintentionally do his Dempsey roll but of course they are not Jack Dempsey so it leaves me with the pleasure of counter-punching them to a beating . I know Mike Tyson and Rocky Marciano are small for heavyweights but they knock out the bigger guys anyway. So who else?