World heavyweight champion Oleksandr Usyk has been ordered by the WBO to begin negotiations with Joseph Parker for a mandatory title defence.

Parker, 33, retained his interim WBO title in February with a second-round knockout win against Martin Bakole.

Usyk, 38, and Parker have 30 days to find an agreement or the WBO will order purse bid proceedings.

Britain's Daniel Dubois, who holds the IBF heavyweight belt, is already in talks to face Usyk for the undisputed heavyweight title.

So who do you want Usyk to face next?