Only including fights I've seen in full. No "I heard it was great" type of thing, like Zale-Graziano 1-2.

I recommend to download any of these fights if you have not seen them.

Heavyweight: Muhammad Ali-Joe Frazier 3
Honorable Mentions: Joe Frazier-Muhammad Ali 1, Michael Moorer-Bert Cooper, Larry Holmes-Ken Norton, Evander Holyfield-Michael Dokes, Riddick Bowe-Andrew Golota 2, Riddick Bowe-Evander Holyfield 1, Rocky Marciano-Jersey Joe Walcott 1

Cruiserweight: Evander Holyfield-Dwight Qawi 1
Honorable Mentions: James Toney-Vassily Jirov

Light Heavyweight: (tie) Archie Moore-Yvon Durelle 1 and Matthew Saad Muhammad-Marvin Johnson 1
Honorable Mention: Matthew Saad Muhammad-Marvin Johnson 2, Matthew Saad Muhammad-Yaqui Lopez 2

Super Middleweight: Nigel Benn-Gerald McClellan
Honorable Mention: Frankie Liles-Tim Littles 2

Middleweight: Iran Barkley-Roberto Duran

Honorable Mentions: Caveman Lee-John LoCicero, Marvin Hagler-Thomas Hearns, Kelly Pavlik-Jermain Taylor 1, Jorge Castro-John David Jackson 1

Junior Middleweight: Felix Trinidad-Fernando Vargas

Honorable Mentions: Simon Brown-Vincent Pettway, Oscar De La Hoya-Fernando Vargas

Welterweight: Antonio Margarito-Miguel Cotto
Honorable Mentions: Ray Leonard-Roberto Duran 1 (the clinching prevents this from being #1).

Junior Welterweight: Aaron Pryor-Alexis Arguello 1
Honorable Mentions: Julio Cesar Chavez-Meldrick Taylor 1, Arturo Gatti-Micky Ward 1, Micky Ward-Emannuel Burton/Augustus, Miguel Cotto-Ricardo Torres

Lightweight: Diego Corrales-Jose Luis Castillo 1
Honorable Mentions: Jose Luis Ramirez-Edwin Rosario 2, Roberto Duran-Esteban Dejesus 2, Ivan Robinson-Arturo Gatti 1, Joel Casamayor-Michael Katsidis

Junior Lightweight: Bobby Chacon-Bazooka Limon 4
Honorable Mentions: Bobby Chacon-Cornelius Boza Edwards 2, Marco Antonio Barrera-Erik Morales 3, Manny Pacquiao-Erik Morales 2

Featherweight: Kevin Kelley-Troy Dorsey
Honorable Mentions: Naseem Hamed-Kevin Kelley, Danny Lopez-Mike Ayala, Salvador Sanchez-Azumah Nelson

Junior Featherweight: Marco Antonio Barrera-Erik Morales 1

Honorable Mentions: Israel Vazquez-Rafael Marquez 3, Somsak Sithchatchawal-Mahyar Monishpour

Bantamweight: I don't know.

Junior Bantamweight: Kid Akeem Anifowoshe-Robert Quiroga
Honorable Mention: Fernando Montiel-Luis Melendez

Flyweight and below: Michael Carbajal-Humberto Gonzalez 1

Honorable Mention: Saman Sorjaturong-Humberto Gonzalez, Jorge Arce-Hussein Hussein 1