For me Vazquez v Marquez. That third fight and the 12th round onslaught from Vazquez was sensational.
There are quite a few, I actually think Patterson vs. Johansson was the best heavyweight trilogy. :good
Leonard-Duran. The 1st is my favorite fight of all time, the 2nd, the fight I hate the most, and the third is interesting, even though my boy lost, he still made Leonard bleed.
Gatti/Ward. You don't get a lot of fights where the two are taken to hospital afterwards for brain scans.
regardless, Jake got as much out of SRR, as Frazier got out of Ali.. LaMotta/Duran would have been an epic trilogy..