Just off the top of my head, there are so many great ones. Louisville and Kentucky, UCLA and USC, Michigan and Michigan State, North Carolina and North Carolina State, Duke and North Carolina State, and of course the biggest one imho, Duke and North Carolina. I've been watching Game Day this morning and they showed a stat. Duke and North Carolina have played 100 times since 1980, both of them have won 50. That's crazy to me even if you tried to do that. If I forgot a rivalry or two, feel free to add it.