Kid Monk Baroni

Kid Monk Baroni is a 1952 American film noir sport film directed by Harold D. Schuster. It is also known as Young Paul Baroni in the United Kingdom. It features Leonard Nimoy, later in "" as Spock, in his first lead role in a motion picture.
Plot.
A disfigured street kid (Leonard Nimoy) has plastic surgery and turns pro after a parish priest (Richard Rober) shows him how to box. After the surgery, Monk becomes conceited, losing the respect of Angelo and Emily, and his manager convinces him to resume fighting to pay his unpaid bills.
During the comeback fight, Monk drops his dirty tactics and his opponent wins by split decision. With money going out due to Monk’s new clean tactics, his syndicate plans recoup their losses by forcing his return to dirty fighting.
In the next fight after Monk’s reform, Father Callahan and Emily are in the audience for his match against the Wildcat, which Monk loses to TKO in round 6, costing the syndicate $20,000.
Father Callahan congratulates Monk on his new ethics, and Monk and Emily reunite and marry to further Father Callahan’s sports initiative.