I think both Amir Khan's and Marcos Maidana's stock rocketed on Saturday night and both left with something positive. Marcos Maidana showed there are no lows he can't come back from and that the Ortiz win wasn't out of luck, in fact, he can compete with the elite and give them either the fight or the knockout of their life. And Amir Khan put all those demons behind first showcasing his stellar skills when the world was carefully watching, than overcoming serious moments with incredible heart and determination for a well-deserved win. You could say in a way this fight defined not one but two careers, as such competitive, dramatic, close fights often do. What fights would you throw in that defined both participants on the same night?
Well as already wellsini gave Oscar-Mosley 1 I'm thinking of Vitali-Lewis, Azuma Nelson-Sal Sanchez, trilla in Manila there should be a lot others
Catillo vs. Corrales -- you can't say the name of one without mentioning the other. JCC vs. Taylor -- Taylor was never the same. JCC had the Don King aroma attached to him for the rest of his career. Marquez vs. Vasquez -- see first comment
Pacquaio fight was more important to Marquez. Barrera was what made pacquaio. Judah vs tszyu Castillo vs floyd
Kind of think Williams / Martinez I & II will both define their careers and always be two of their three most significant/epic fights.