1. Hagler (I think he won vs SRL). 2. Leonard (talented but dodged Hagler early in his career) 3. Duran 4. Hearns
Not enough Hearns love on this forum... How can there be a considerable gap between Duran / Leonard and Hearns? Hearns knocked Duran out, savagely. Also, he fought Leonard twice; beating him up until Leonard got the desperation knockout in the 14th and loosing a super shady decision in the second fight (which almost everyone thinks Hearns actually won). Hearns was great, and he could have won even more matches than he did if he hadn't prioritized the fans enjoyment of a match over the actual W on his resume... I say Hearns was the best followed by Hagler, Duran and Leonard.
Hard to make a list where any one of these is 4th at anything, but here goes Hagler Leonard Hearns Duran