Mike Tyson was a professional heavyweight boxer.
Heavyweight is a weight class in boxing and other combat sports . Mike Tyson . This made Tyson the first heavyweight boxer to simultaneously hold the WBA , WBC and IBF titles , and the only heavyweight to successively unify them . With his defeat of Bruno , Tyson joined Floyd Patterson , Muhammad Ali , Tim Witherspoon , Evander Holyfield , George Foreman as the only men in boxing history to have regained a heavyweight championship after having lost it .