Myrna Loy
Belle Mercer
Max Baer
Steve Morgan
Primo Carnera
Carnera
Jack Dempsey
Promoter
Walter Huston
Edwin J. Bennett ("The Professor")
Otto Kruger
Willie Ryan
Vince Barnett
Bugsie
Robert McWade
Adopted Son
Muriel Evans
Linda
Jean Howard
Show Girl
Cora Sue Collins
Farmer's Daughter (uncredited)
Dennis O'Keefe
Nightclub Patron (uncredited)
Jack Pennick
Bar Patron #6 (uncredited)
Matt McHugh
Professor's Drinking Buddy (uncredited)