Kamaru will defend his title against Leon in Salt Lake City, Utah, in the main event of UFC 281 on August 20.
The UFC was waiting on Usman to recover from his hand surgery in order to book the title match.
The No.1 pound-for-pound fighter in the world is Usman. They are the top two ranked at their weight class. In December 2015, the two met for the first time.
Anderson Silva's 16 in a row is the second most in promotion history, but it's not the most wins by a fighter. The Nigerian born fighter is coming off a unanimous decision victory over his opponent. He won the title in March of 2019.
He hasn't fought since a unanimous decision win overNateDiaz in June 2021. Since falling to him seven years ago, the Jamaican-born England resident has not lost a game. Vicente Luque, Donald "Cowboy" Cerrone, and Rafael dos Anjos have all been defeated byEdwards.
The UFC hasn't been to Salt Lake City since August of last year. It will be the first UFC pay-per-view card in the city, and only the second UFC event there.