• Usyk has 30 days to agree heavyweight title defence
• Britain’s Dubois had hoped for rematch with Ukrainian

Oleksandr Usyk has been ordered to start negotiations to defend his WBO heavyweight title against Joseph Parker, potentially scuppering Daniel Dubois’ hopes of a rematch with the Ukrainian.

The WBO has announced Usyk, who also holds the WBC and WBA crowns, has 30 days to “reach terms” for a mandatory title defence against New Zealand’s Parker or the sanctioning body will call for purse bids.