Dern Submits Ribas in UFC Vegas 101 Rematch
This Fight Night 249 preview is now a look back at how the January 11, 2025 rematch between Mackenzie Dern and Amanda Ribas ended. Dern submitted Ribas with an armbar at 4:56 of the third round in the main event at the Las Vegas APEX, avenging her 2019 decision loss and leveling their series at one win apiece. The official event report lists the finish and round.
Why the rematch mattered
Ribas won their first meeting on October 12, 2019, by unanimous decision, handing Dern the first defeat of her professional MMA career. The official Tampa event results record a 30–27 score from all three judges. Their second fight came more than five years later, with both athletes having built considerably more Octagon experience.
How Dern won
The rematch featured extended grappling exchanges. The official recap describes Dern controlling from top position in the opening round, Ribas responding in the second, and Ribas again working on top in the third. Dern found the armbar in the closing seconds and secured the tap with four seconds left. The official scorecards confirm the finish at 4:56 of Round 3.
Event details and result
Fight Night: Dern vs. Ribas 2 took place on Saturday, January 11, 2025, at the Las Vegas APEX. The bout was a women’s strawweight main event scheduled for five rounds; it ended before the championship rounds. For the complete card and archival coverage, see the event page.
