Muhammad Ali's incredible boxing career led to him being recognised as one of the greatest fighters of all time.

Muhammad Ali shocked the world by beating George Foreman ... Brown eventually fell out of favor when he sold Ali's championship belt to a Harlem barber for $500. Ali was known as Cassius Clay ...

Oleksandr Usyk is often regarded as one of the greatest fighters of the modern era. The Ukrainian has become the undisputed champion in the cruiserweight and he ...