Sofia Montenegro withdrew from her UFC debut at UFC Mexico City on February 28, 2026, leaving Ernesta Kareckaite without an opponent days before the event at Arena CDMX. Undefeated knockout artist Regina Tarin (7-0) stepped in on three days' notice for a 130-pound catchweight bout. Tarin, a 21-year-old with an 84% finish rate including four KOs, was already scheduled for Muay Thai nearby. Kareckaite (6-1-1, 1-1 UFC) seeks back-to-back wins after beating Nicolle Caliari. This reshuffle bolsters the women's prelims amid a stacked card headlined by Brandon Moreno vs. Lone'er Kavanagh. No further changes expected, highlighting UFC's quick adaptability.
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