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)