Ortega vs Paret I Scott vs Ortega I Duran vs Leonard I Basilio vs DeMarco II Griffith vs Paret III Gavilan vs Turner Basilio vs Saxton II Palomino vs Green Brown vs Trice I Palomino vs Stracey HM to Basilio-Turner, Palomino-Muniz I, Stracey-Napoles, Marquez-Pacquiao IV and Margarito-Cotto. In some vague order. Probably loads of other contenders too.
A few more to add to George's list: Leonard-Hearns 1 (obvious, but it has to be there) Bratton-Fusari Trinidad-Campas Davis-Breland Cuevas-Espada 2 Mosley-De La Hoya 1
Both Paret-Scott fights are brilliant. Can't really include them because I know nobody else here has seen them. God, I feel like that cunt Fleaman
I mean, it was one sided, but Duran-Palomimo was an excellent fight because Palomino never stopped trying, even while getting thrashed.
Leonard-Benitez could be included if we're talking a high level technical chess match as being a great fight.