UFC Fight Night: Fiziev vs. Gamrot (also known as UFC Fight Night 228, UFC on ESPN+ 86 and UFC Vegas 79) was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on September 23, 2023, at the UFC Apex facility in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States.
A lightweight bout between Rafael Fiziev and former KSW Featherweight and Lightweight Champion Mateusz Gamrot headlined the event.
A heavyweight bout between promotional newcomer Valter Walker and Jake Collier was booked for this event. However, Walker withdrew due to an ankle injury. He was replaced by The Ultimate Fighter: Team Peña vs. Team Nunes heavyweight winner Mohammed Usman.
A flyweight bout between Bruno Gustavo da Silva and Cody Durden was expected for this event. However, Durden was instead scheduled to face Jake Hadley at UFC on ESPN: Sandhagen vs. Font and the bout was cancelled.
A middleweight bout between Aliaskhab Khizriev and Jacob Malkoun was scheduled for the event. However, Khizriev was pulled from the event for undisclosed reasons and was replaced by promotional newcomer Robert Bryczek. Bryczek then also pulled out of the fight and was replaced by Cody Brundage.
The following fighters received $50,000 bonuses.
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