Report: Usyk losing IBF belt; Hrgovic-Dubois will be heavyweight title fight

Oleksandr Usyk's reign as the undisputed heavyweight champion of the world will be a brief one.

Usyk, who earned the titles with his historic win over Tyson Fury on Saturday, will either be stripped of or vacate his IBF belt within the next two weeks, according to Michael Benson of TalkSPORT. Once that happens, the Filip Hrgovic-Daniel Dubois bout June 1 is expected to be announced as the IBF heavyweight title fight.

Hrgovic is the IBF's mandatory challenger at heavyweight, but he has to wait to face Usyk because Fury immediately exercised his rematch clause following the loss. The Fury-Usyk rematch is expected to take place in October with three of the four belts on the line.

Former heavyweight champion Anthony Joshua is likely to immediately challenge the Hrgovic-Dubois winner, according to Benson.

Usyk's split-decision victory over Fury made him the first undisputed heavyweight champion in boxing's four-belt era and the first at the level in 24 years. The former cruiserweight champion also joined Terence Crawford and Naoya Inoue as the third male boxer to be undisputed at two different weight classes in the four-belt era and overtook Inoue for top spot in The Ring's pound-for-pound rankings.

The most recent undisputed heavyweight champion to fight in defense of his belts was Evander Holyfield in 1992. Riddick Bowe vacated one of his belts within a month of winning them from Holyfield, while Lennox Lewis was stripped of the WBA title shortly after his coronation in 1999.

Hrgovic, 31, heads into the Dubois fight with a 17-0 record and 14 knockouts. The Croatian previously held both the WBC and IBF "international" heavyweight titles but has never owned a main belt.

Dubois (20-2, 19 KOs) was the WBA's "regular" heavyweight titleholder before suffering a knockout loss to Usyk in a title fight last August. The 26-year-old recovered from that defeat with a TKO win over Jarrell Miller on Dec. 23.

Hrgovic-Dubois is part of a stacked June 1 card in Riyadh, Saudi Arabia, that also includes the Dmitry Bivol-Malik Zinad light heavyweight title fight and a clash between star heavyweights Deontay Wilder and Zhilei Zhang.