The Greatest, the Baddest and the Best: six undisputed heavyweight champions

The ever-bubbling alphabet soup of boxing sanctioning bodies -- the winner in Riyadh becoming the first four-belt heavyweight champion -- means that becoming, and remaining, undisputed champion requires not just skill and toughness in the ring, but acumen outside it. Usyk joined a select group. Here AFP Sport picks six of the undisputed best. Jack Dempsey (Undisputed champion from Jan 1921 to Sept 1926, 3 defences) The hard-hitting and aggressive Jack Dempsey became the first official world...