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)

W.S. Van Dyke