Rumoured to be fixed : Willie Pep v Lulu Perez Joe Gans v Terry McGovern Clay v Liston Ali v Liston Sam Langford v Fred Fulton Duran v Leonard 2
It's virtually [almost] impossible to "prove" a fix. Even if the loser claims so.It gives them an excuse that the "winner" was really not the better man.
Everett/Escalera is considered a fix. I think most people now believe Ramirez/WhitakerI was fixed too. And Pep's fix (mentioned above, to Lulu Perez), earned him a career ban from fighting in New York City.