Examples of fighters who met early in their careers and both became big names

[-GDS-]

Pryor beat Hearns in the amateurs as well as Berto beating Bradley.

Berto also beat Dirrell in the ams. And I'm not sure but he may of faught and beat both of the twice. Or at least Dirrell.

[Discipline]

Tszyu beat Forrest in the amateurs.

[Neglect]

Why are we talking amateurs? I would find early pro fights more appealing. Amatuers is a different game.