The 11th in the Turn Of Fate short television movies, Crowd Pleaser (bottom right image) is from 1957.
Robert Ryan stars as a boxing manager, Frank Berry.
He manages Bill (played by Stuart Whitman), who appears to be heading for the big time.
However, he gets picked up by a promoter who pushes him too far.
To show him that he’s not ready yet, Frank fights Bill to teach him a lesson.
It works.
Movie pages here.