Hours before the fighters competing on Saturday’s UFC Rio event are scheduled to officially weigh-in, the fight card lost one of its bouts. A heavyweight clash between the brothers of former welterweight champion Kamaru Usman and light heavyweight contender Johnny Walker , Mohammed Usman and Valter Walker, was suddenly cancelled after Usman withdrew for undisclosed reasons. Usman (11-4) won The Ultimate Fighter 30 Heavyweight Tournament in 2022.
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