WBO

The 25-year-old's recent title is questionable as it is not declared by the world or regional boxing bodies

Japanese boxer intends to prove he rules bantamweight world when he faces England’s Butler

Between them, the two boxers currently hold all the major versions of the heavyweight world title

WBO ordered the champ to defend his title against Ukrainian after the Briton's bout with Tyson Fury was called off

After Brit's bout against Fury became a doubt, he and the challenger have until May 31 to reach an agreement

American boxer beats Canada's Marie-Eve Dicaire to become first undisputed world champion in two different divisions

Using a punchbag, he then describes how to "hit her on the chin" and "finish her off"

British boxer soundly defeated Wilder to claim the WBC belt and the pair are expected to meet for a third time