AllMovie

Knock-Out is a form-fitting movie vehicle for world heavyweight boxing champion Max Schmeling. Through a masterstroke of casting, Schmeling plays a boxer, named Max Breuer. Allowing success to go to his head, Breur finally comes to his senses through the love of a good woman. If Max Schmeling seems more animated than usual during his love scenes, it may be because his leading lady is his real-life wife Anny Ondra. One wonders if Knock-Out received much attention after Schmeling was defeated in a single round by Joe Louis in 1938.