And when I mean beat, I mean win, doesn't have to be some one-sided schooling or what not
Marvin Hagler
Pernell Whitaker
Manny Pacquiao
Roberto Duran
Thomas Hearns
Oscar De La Hoya
Juan Manuel Marquez
Erik Morales
Marco Antonio Barrera
Felix Trinidad
Roy Jones
Julio Cesar Chavez Sr.
Aaron Pryor
Kostya Tszyu
Prime ATG great fighters don't lose very often, thats why they are ATG's.
Offhand Duran beating SRL, Morales beating Barerra and Visa versa, Hagler beating Hearns come to mind as prime ATG beating prime ATG.