Casey O'Niell

Casey O'Neill is a 28-year-old Scottish flyweight who has turned her childhood obsession with fighting into a UFC ranking. Raised in Irvine and trained by her father from youth, O'Neill committed fully to combat sports, turning pro in 2019 with a stellar 5-2 amateur record highlighted by five consecutive finishes. Her UFC career, which began in February 2021, has seen her build an 11-2 record marked by sudden, violent finishes: four knockouts and two submissions, including pair of first-round stoppages that announce her presence in the octagon.

O'Neill fights as an aggressive striker with heavy hands and ring generalship. Her official stats show she lands over seven significant strikes per minute while maintaining 58 percent strike defense, meaning she attacks without recklessness. Her finishing instinct extends to the ground, where she has submitted opponents via rear naked choke and exploits her brown-belt jiu-jitsu at key moments. She lands 81 percent of her significant strikes from standing range, underscoring a preference for the standup game, though her grappling remains a threat.

Recent form has been strong: a knockout of Gabriella Fernandes in March 2026 punctuated an otherwise solid 2024-2025 run that included a three-round decision win over Luana Santos. She has tasted high-level competition, falling to Jennifer Maia and Ariane Lipski in 2023, losses that tested but did not derail her ascent. At #11 in the women's flyweight rankings, O'Neill sits on the edge of title contention, needing a few more signature wins to crack the top five. Her combination of precision striking, finishing power, and technical grappling makes her one of the division's more complete athletes and a reliable source of exciting fights.