I have to agree with the posters who listed Hagler-Hearns...the greatest 3 rounds in boxing history. Great other choices though.
DLH-Mosley 1 was a very underrated fight and one of my all time faves. It was a bit little overlooked because I believe it was the same year has Morales-Barrera 1. You had to speedy superb combination punchers and the way Oscar came out with fire in the 12th rd and couldn't get the job done was very exciting
I really enjoy watching Whitaker - Mcgrit I, brilliant fight between two of the best technicians of their era. It lacked KD's and a KO, but the sheer skill shown by both fighters more than makes up for it.