from what i have seen, MAB V Erik 1 was the best fight ever in the history of boxing. but there are some great mexican fights that i havent seen. chucho castillo v olivares 1 was a classic that i have never seen. i have zarate v zamora there was loads of great fights between hombre's in the 60's and 70's
I think it would be hard to beat Marquez - Vasquez III That was a hell of a fight; better than Morales-Barrera I for me.
Morales Barrera 1 reigns supreme not just as best ever Mexican fight but best ever fight period that I have witnessed. Ps. salsanchezfan showed me a 5 min clip of Chacon Limon 4 & it looks capable of toppling EM MAB 1 but I`ll have to see the full fight, it was 1982s FOTY. Ive already ordered it & it should be here within a week or 2 so I`ll let you know how it compares to Erik & co. Honourable mentions go to... Duran SRL 1... Ali Frazier 3... Hagler Hearns.
My fave fight ever is Morales-Barrera 1, so i'd personally go with that. The Vazquez-Marquez fights may challenge in the opinions of some though.