Oleksandr Usyk's time as the undisputed heavyweight champion of the world will be short lived - as he's giving up his IBF belt.
The Ukrainian beat Tyson Fury last month and also holds the WBC, WBO and WBA titles.
But he's contracted for a rematch, so can't face IBF mandatory challenger Daniel Dubois - who's likely to face Anthony Joshua for the honour at Wembley.
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