Bare Knuckle Boxing returns to Miami on August 29 for BKB 58, a 13-bout card headlined by Gustavo Trujillo’s heavyweight title defense against Mark O’Neil. The event also features the bare-knuckle debut of Olympic gold medalist Yuriorkis Gamboa, the promotional debut of former UFC contender Aspen Ladd, and the return of Roberto Duran Jr.—son of the legendary “Manos de Piedra”—against Ryan Spivey.
BKB 58 Key Facts
Trujillo enters the main event with a flawless 8-0 promotional record, having finished every opponent in the first round. Gamboa, a 2004 Olympic flyweight champion who later unified the WBA and IBF featherweight titles, makes his highly anticipated bare-knuckle debut in the co-main event. All bouts take place inside the Trigon, BKB’s signature three-sided cage with 60-degree corners.
Duran Jr. is no stranger to the promotion, having earned a second-round TKO victory over Joshua Sikes at BYB 37 in 2025. “This is my city, my home, and I’m bringing that energy into the Trigon,” Duran Jr. said. “My father sealed his envelope a long time ago; this is about my own legacy now. Spivey’s tough, but I’ve got business to finish and I’m going to finish it in front of my people in Miami.”
“Roberto Duran Jr. carries one of the great names in boxing history and he’s proven time and again that he can back it up inside the Trigon,” said David Tetreault, BKB CEO. “Matching him in Miami against a fighter like Ryan Spivey, who has earned every bit of his growing reputation, is exactly the kind of matchup our fans expect from BKB. This is must-see action.”
Complete BKB 58 Fight Card
The following bouts have been announced by BKB Bare Knuckle Boxing as of publication.