Two in the Ring (1968)

Ted Boy and Renato, two clumsy mechanics from the countryside, are dating two young women who live in a luxurious mansion near their workshop. Ted Boy gets into a fight with some catch fighters, and their coach, thrilled with his performance, invites him to train. Ted Boy trains diligently and, in a dizzying career, becomes a serious contender for the ultimate title. Criminals try to buy him into losing the final fight, but when they fail, they kidnap his girlfriend and threaten him with blackmail.