19. Mike Tyson
Few people injected fear into the hearts of their opponents like “Iron Mike.” The heavyweight champion knocked out everybody that stood in his way before a shock loss to Buster Douglas. He became one of America’s sporting heroes.

Then, Tyson went to jail after a court found him guilty of rape. It’s impossible to support a convicted rapist so he lost many fans immediately. However, he returned to boxing after his release from prison and rehabilitated his image (via Chicago Tribune).