In terms of historical significance, Ali va Frazier and Louis vs Schmeling In terms of the actual rivalry aspect of it, Jack Britton and Ted Kid Lewis.
God dude how did I forget about Ali and Fraizer… thinking about it I like that way more than Liston and Ali. Much more emotional.
Langford fought Wills 17 times. Despite losing 13 of those fights he was the king of rivalrys fighting Jeanette, McVea, Jim Johnson, Jeff Clark and Jim Barry(who was white) all 10 times or more and a few others 9 times. The whole group above(not Wills) combined for 7 victories in 60 plus fights.
People might laugh at this one, but Chris Eubank-Nigel Benn. Definitely up there as one of the greatest rivalries in boxing history.
Bowe-Holyfield Proved how great the Big Daddy was and elevated Holyfield to higher levels after the beating he took in the first fight. It was an eye opener for him just as the Bert Cooper fight was.
Ketchell v Papke Marquez v Pack man Minter v Finnigan SRR v LaMotta Greb v Kaiser Moore v Johnson Nelson v Gans to name a few.... stay safe guys.
Ali-Frazier Louis-Schmeling Robinson-LaMottta Tunney-Greb Pep-Saddler Greb-Flowers Duran-Leonard If one-sided rivalries are allowed: Chavez-Taylor Leonard-Hearns Charles-Moore