Matthew Saad Muhammad and Yaqui Lopez fought twice, with Muhammad winning both of them by knockout. Granted their second fight is one of the greatest of all time with crazy action in it, but I think Muhammad proved his superiority over the man at that point, and their is no need for a rematch.
Basilio deserved a rematch with Gavilan definitely, the first fight was razor close, I just had Gavilan sneaking it by a point. Dont think Basilio was quite at his prime at that point either, he could very well have beaten Gavilan in a rematch.
Personally I think the man in my avatar deserved a second fight with James Toney, after he clearly won their first contest imo. Not the first time Johnson was given the raw end of the deal either