Let's see, how many such fights you guys can come up with. I can think of at least 6 - but I wonder, how many I have missed?
Shane and Oscar fought multiple as amauters. Some good amauter fights on YouTube between some great but not HOF fighters Juan Carlos Gomez vs Antonio Tarver Jirov vs Tarver Tzyu vs Forrest Ottke vs Ederi
Two of Oscar's six losses as an amateur were to Shane. I'm not sure how many times they fought total though