What happened: Waldo Cortes Acosta steps in to face Johnny Walker in the main event of UFC Vegas 124 on Saturday, Nov. 7. The bout headlines UFC Fight Night 293, streaming live at 8 p.m. ET on Paramount+.

Why it matters: The matchup marks a short-notice headline slot after the promotion adjusted the card's top billing. Both fighters secure prime placement on the November schedule as the UFC finalizes its late-season slate.

What to watch: Official weigh-ins and final card confirmations will take place ahead of Saturday's event.