Kayla Harrison will miss her bantamweight title defense against Amanda Nunes at UFC 324 in Las Vegas. A neck injury—reported to involve herniated discs—has forced the bout to be postponed, with surgery likely required before the event's rescheduled date to be announced by the promotion.

UFC president Dana White had dubbed the matchup the "biggest women's fight of all time," underscoring Nunes' status as the only woman to hold titles in two divisions. Harrison captured the belt in just her third UFC bout, defeating Julianna Pena in June, and now faces a setback that could delay her legacy.

With the co‑main event reshuffled, Sean O'Malley now faces Song Yadong for the spotlight. Fans will watch how the promotion manages the rescheduling and whether Harrison recovers in time for a future title clash. Analysts predict the delay could shift the bantamweight hierarchy and open new rivalries and could influence title shot timelines.