Sources -- Oleksandr Usyk, Tyson Fury break off talks for title bout

Talks to finalize the undisputed heavyweight championship fight between Tyson Fury and Oleksandr Usyk on April 29 at London's Wembley Stadium have broken off, sources connected to both fighters told ESPN.

The sides agreed on a 70-30 split in favor of Fury for the net revenue earlier this month, but Fury and Usyk couldn't agree on other material terms critical to the deal beyond the split, sources said. Usyk, a 35-year-old Ukrainian, has shut down his training camp, according to sources, and will regroup with his team to plot his next fight.

«No matter how much Usyk compromised, he was pushed for more,» Usyk's manager, Egis Klimas, told boxing reporter Steve Kim, who first reported that talks had fallen apart.

Usyk holds the WBA, WBO and IBF heavyweight titles and is ranked No. 2 by ESPN at heavyweight. Fury, the WBC champion, is ESPN's No. 1 heavyweight. Three mandatory challengers are waiting for their shot at Usyk, but England's Daniel Dubois is up first in the rotation system used for boxing's unified champions.

Ahead of the March 10 deadline imposed by the WBA for Fury and Usyk to agree to a deal — and hold off the official order for an Usyk-Dubois bout that would spoil such plans to crown an undisputed champion — the sides both informed WBA president Gilberto Mendoza that a tentative agreement was reached.

Fury and Usyk continued to argue over the negotiations on social media before Mendoza set an April 1 deadline for signed contracts to be received. Now, the WBA is poised to order a fight between Usyk and Dubois unless a last-ditch effort can be made to salvage a fight against Fury.

«They want 50%, Usyk and all this 'Tyson is being greedy,'» Fury, ESPN's No. 7 pound-for-pound boxer, said in an Instagram video March