Wallace Beery

as Andy 'Champ' Purcell

Jackie Cooper

as Dink Purcell

Irene Rich

as Linda Carleton

Roscoe Ates

as Sponge

Edward Brophy

as Tim

Hale Hamilton

as Tony Carleton

Jesse Scott

as Jonah

Marcia Mae Jones

as Mary Lou Carleton

Dannie Mac Grant

as Boy Taunting Dink (uncredited)

Frank Hagney

as Mexican Champ Manuel Quiroga (uncredited)

Dell Henderson

as The Doctor (uncredited)

Tom McGuire

as Los Angeles Promoter (uncredited)

Bob Perry

as Referee (uncredited)

Lee Phelps

as Louie the Bartender (uncredited)

Andy Shuford

as Boy at Racetrack (uncredited)

Dan Tobey

as Ring Announcer (uncredited)