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

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.

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

Golovkin knocked Bute out in the amateurs but I'm not sure if you can call Golovkin big name

James Toney & Roy Jones Jr.

I think Manfredo Jr. beat Bute in the amateurs or something like that. Also Vasquez-Canelo... I think Canelo beat Vasquez on his debut, then beat him again a little later

Benn - Eubank Hopkins - Jones Sugar Ray Leonard - Tommy Hearns

Lennox, stopped Bowe in the Olympics

I was thinking about the Martinez-Margarito fight back in 2000, wondered if anyone had any similar examples to share. I know Calzaghe and Byrd met as amateurs. Sanchez & Nelson Pep & SRR fought an amateur fight. Khan schooled Ortiz in the amateurs Calderon convicingly beat a young Cotto in the amateurs. Groves and DeGale fought when they were quite inexperienced in the pro game.