4. Sam Bradford, Arizona Cardinals (2018):
Just like Bradford is one of the biggest draft busts ever due to his overall status and track record, the Oklahoma product is also one of the worst free agent signings ever. He showed flashes in Minnesota but was ultimately unable to stay on the field, a growing occurrence for him.
Despite that, the Cardinals lavished a potential two-year deal worth up to $20 million on the oft-injured name. Three miserable starts under doomed head coach Steve Wilks and he was released. Bradford has yet to resurface.
