I wanted to make a post of boxers that I'd like to see in FNR4, albeit cabs. I really like the names listed so far, anyways here's adding to the list:

Jack Dempsey
Gene Tunny
Jack Sharkey
Harry Greb
Kid Gavilan
Max Baer
James J. Braddock
Billy Conn
Sandy Saddler
Charlie Burley
Rocky Graziano
Ingemar Johannson
Emile Griffith
Joey Giardello
Florentino Fernandez
Holly Mims
George Benton
Flash Elorde
Sandy Saddler
Carlos Ortiz
Sonny Liston
Henry Cooper
Jose Torres
George Chuvalo
Gerry Cooney
Michael Moorer
Roger Mayweather
Mike McCallum...

I'll add more later. I hope that they don't have a cap on the number of fighters you can make.