Sofia Montenegro, a Season 9 Contender Series contract winner set for her UFC debut, has withdrawn from UFC Mexico City on February 28, 2026, at Arena CDMX for undisclosed reasons, leaving Ernesta Kareckaite without an opponent. Undefeated 7-0 knockout artist Regina Tarin, a 21-year-old prospect known as 'Kill Bill' with an 84% finish rate, steps in on three days' notice at a 130-pound catchweight. Tarin was already scheduled for a Muay Thai fight in Mexico City, easing the switch; she has notable wins under Combate Global including over ex-TUF fighter Kaytlin Neil. Kareckaite (6-1-1, 1-1 UFC) recently won a decision over Nicolle Caliari. This reshuffle bolsters the women's flyweight prelims amid a stacked card headlined by Brandon Moreno vs. Lone'er Kavanagh. Expect no further changes as the event nears.
