- Billy Conn
- Billy Conn
- Jean Parker
- Patricia Mallory
- Dick Purcell
- Cliff Halliday
- Alan Baxter
- Joe Barton
- Veda Ann Borg
- Barbara Ellison
- Jonathan Hale
- Max Ellison
- Ernest Whitman
- Feets Johnson
- John Kelly
- Knockout Riley
- Etta McDaniel
- Magenta
- Dick Elliott
- Garvey
- John Harmon
- Morrie
- Robert Barron
- Devlin
- Henry Armstrong
- Sparring Partner
- Sam Balter
- Radio announcer
- Arthur Donovan
- Referee
- Jack Roper
- The Champ
- Freddie Steele
- Freddie Steel
- Dan Tobey
- Fight announcer
- Edmund Cobb
- (uncredited)
- Donald Douglas
- (uncredited)
- William Forrest
- (uncredited)
- Harrison Greene
- (uncredited)
- Kit Guard
- (uncredited)
- Russell Hicks
- (uncredited)
- Nora Lane
- (uncredited)
- Charles Sullivan
- (uncredited)
- William Telaak
- (uncredited)
