The Last Fight (1983)

Starring:

• Willie Colón
• Rubén Blades
• Fred Williamson

IMDB.com
Singer-turned-boxer Andy 'Kid' Clave signs a contract with a shady promoter Joaquin Vargas. But Clave turns against Vargas when the promoter's thugs kill Clave's girlfriend when he thinks about backing out of the contract. While seeking a way to get revenge against Vargas, Clave learns that he has a blood clot in his head. But nothing will deter him from getting his revenge and making a shot at the title.

Thanks Lupine!