Sean O’Malley’s current fights are typically scheduled for either 3 or 5 rounds, depending on whether he’s in a main event or title fight.

For his most recent bout at UFC 324 against Song Yadong on January 24, 2026, the fight was scheduled for 3 rounds and went the full 3 rounds to a unanimous decision. Earlier in his career and in non-title, non-main-event bouts, his UFC fights have usually been 3 rounds, while his title and main-event fights (for example, against Marlon Vera and Merab Dvalishvili in 2024–2025) were 5-round fights.

If you’re asking in general:

  • Standard Sean O’Malley non-title, non-main-event UFC fights → 3 rounds.
  • Title fights or main events featuring O’Malley → 5 rounds.

So if you have a specific card in mind (like UFC 324), that Song Yadong fight was a 3-rounder; if he’s headlining or defending/contending for a belt, expect 5 rounds.

Information gathered from public forums or data available on the internet and portrayed here.