Bomber (1982) on Netflix

Plot summary

Bud Graziano was a heavyweight boxing champion who retired to private life on a ship and swore he would never fight again. He meets Jerry, a Lombard punter who always finds himself in trouble, and Jerry ends up facing a group of thugs. Those thugs take orders from a new boxing champion who has been making the rounds with victory after victory. Bomber comes up against that circle too, and his passion for boxing awakens. He sets up a gym for amateurs and starts coaching Giorgio Desideri, a promising young fighter called Giorgione.