In Pixar's Cars 3, Cruz Ramirez defeats Jackson Storm in the Florida 500.
The Florida 500 is the film's climactic race. After initially acting as Lightning McQueen's trainer, Cruz takes over as the racer representing Rust-eze when Lightning decides to compete. She uses the skills developed during their training and ultimately passes Jackson Storm to win the event.
The victory changes the direction of the story rather than simply restoring Lightning's career. Lightning recognizes Cruz's talent and supports her as the new racer, while he adopts a mentor role inspired by Doc Hudson. The result gives the film a generational handoff within the racing world.
The race name can be confused with the Piston Cup, which is the championship associated with the series. The Florida 500 is a specific event, while the Piston Cup is the larger racing competition and trophy context surrounding the Cars films.