After wins against John Henry Lewis and Art Lasky, a title fight against Baer comes his way. Braddock is a 10-to-1 underdog. Baer is so destructive that the fight's promoter, James Johnston, forces both Braddock and Gould to watch a film of Baer in action, just so he can maintain later that he warned them what Braddock was up against, as Baer had reportedly killed 2 men in the ring.

Braddock demonstrates no fear. The arrogant Baer attempts to intimidate him, even taunting Mae in public that her man might not survive. When he says this, she becomes so angry that she throws a drink at him. She is unable to attend the fight at the Madison Square Garden Bowl or even to listen to it on the radio.

On June 13, 1935, in one of the greatest upsets in boxing history, Braddock defeats the seemingly invincible Baer to become the heavyweight champion of the world.

An epilogue reveals that Braddock would lose his title to Joe Louis (who would later call Braddock "the most courageous man I ever fought") and later worked on the building of the Verrazano Bridge, owning and operating heavy machinery on the docks where he worked during the Depression, and that he and Mae used his boxing income to buy a house, where they spent the rest of their lives.