UFC 331 week: Van–Pantoja 2 headlines LA — and a lightweight co-main the UFC won’t call a title shot

Crypto.com UFC 331 lands Saturday, Sept. 19, at Crypto.com Arena in Los Angeles with a flyweight title rematch that unfinished business demanded — and a five-round lightweight co-main that fighters are selling harder than Dana White will.

Main card streams on Paramount+ at 9 p.m. ET / 6 p.m. PT (prelims 7 p.m. ET, early prelims 5 p.m. ET). There is no separate U.S. pay-per-view under the 2026 deal. A CBS linear simulcast for this specific card was not listed on UFC.com, ESPN Fight Center, or Paramount+’s event page as of this writing.

Main event: Joshua Van (c) vs. Alexandre Pantoja (#1)

Van puts the UFC flyweight title on the line against the man he took it from in 26 seconds — and against the unfinished argument that night left behind.

Why this rematch exists

At UFC 323 on Dec. 6, 2025, in Las Vegas, Van won the flyweight belt when Pantoja suffered a fight-ending arm injury 26 seconds into Round 1 and could not continue. Official result: Van def. Pantoja by TKO (injury), Round 1, 0:26. There were no judges’ scorecards.

Night-of reports cited a left-shoulder dislocation with spontaneous reduction. Pantoja’s coach later said the problem was the elbow, not the shoulder, and UFC.com’s August rematch announcement described an elbow injury. The safest reading of the public record: a fight-ending arm injury that UFC later described as an elbow.

White’s immediate plan after UFC 323 was that Van would defend before any rematch, with no clear return timeline for Pantoja. Pantoja’s camp said matchmakers Hunter Campbell and Mick Maynard were open to an immediate rematch if the medical timeline was reasonable. Van, the night he won, asked for the runback once Pantoja recovered.

Van then did what White sketched: he defended at UFC 328 on May 9, 2026, in Newark, stopping Tatsuro Taira by TKO (punches) at 1:32 of Round 5 (Fight of the Night). In the cage afterward, Van called Pantoja out again. The rematch was announced Aug. 5 for Los Angeles.

Stakes the UFC is selling

Pantoja entered that first loss as a former champion with four title defenses (Royval, Erceg, Asakura, Kara-France) after winning the belt from Brandon Moreno at UFC 290. UFC.com frames a Pantoja win at 331 as a bid to become only the third flyweight in UFC history to reclaim the championship, after Moreno and Deiveson Figueiredo.

Van (17-2) is billed as champion; Pantoja (30-6) as No. 1. Van remains the second-youngest UFC champion in company history and the first Asia-born male UFC titleholder, per UFC’s own biographical framing.

What they’re saying this cycle

Van told MMA Junkie he plans to finish Pantoja inside three rounds and that he already beat him once. At the UFC 331 press conference, he went further: even without the injury, he said he would have “whooped” Pantoja that night — his claim, not the official result.

Pantoja answered with heat, telling Van to watch his mouth and that on Sept. 19 they would be locked in the Octagon together. White had to keep them apart at the faceoff. Public reporting this week does not include a detailed 2026 White quote on why the rematch was timed for September; the clearest White and matchmaker trail still dates to December 2025.

Co-main: Arman Tsarukyan (#2) vs. Mauricio Ruffy (#7), five rounds

Officially, UFC.com bills this as a lightweight bout — No. 2 vs. No. 7 — not a title eliminator. Unofficially, the fighters and several outlets have treated it as the clearest path toward Justin Gaethje. White has refused to close that loop.

How the booking got here

Tsarukyan returns for the first time since submitting Dan Hooker in Doha on Nov. 22, 2025. He was originally set for a Charles Oliveira rematch on this card; Oliveira pulled out after the death of teammate Allan Nascimento. Ruffy took the fight on roughly 30 days’ notice, per his own comments to MMA Fighting.

Ruffy (14-2) arrives off a highlight-reel knockout of Michael Chandler at UFC Freedom 250 on June 14, 2026, and a prior stoppage of Rafael Fiziev at UFC 325. His only UFC loss is a submission to Benoît Saint Denis in September 2025. Thirteen of his 14 wins are by knockout.

Tsarukyan (23-3) owns wins over Hooker, Oliveira (split decision at UFC 300), and Beneil Dariush. His recent résumé also includes the January 2025 collapse of a title shot against Islam Makhachev and subsequent outside-the-cage friction with the promotion — context that still shadows how guarantees get heard.

Title-shot talk vs. what White will say

Ruffy has said the UFC and Gaethje framed this as “a straight shot to the title.” Tsarukyan told Ariel Helwani he sat with Hunter Campbell, shook hands, and received a verbal guarantee that a win means a title shot — and that he doubts Ruffy has the same deal. Campbell has not been quoted confirming that handshake account. In a later MMA Fighting interview, Tsarukyan also allowed that “not everything is guaranteed” and that he took the LA fight because Gaethje did not want to fight in 2026.

Gaethje, on Sports Illustrated’s “In the Corner,” called them “two potential contenders” and a good matchup when a host described it as a No. 1 contender fight — softer than a booked next defense. Speaking with Demetrious Johnson (via MMA Junkie, Sept. 11), Gaethje praised Ruffy’s recent tear but said Green and Chandler “aren’t top three,” called Tsarukyan Ruffy’s “first ultimate test” against a world-class UFC fighter, and expected Tsarukyan to wrestle.

White, asked in early September whether it is a No. 1 contender fight, declined: “I hate to say that until the fight is over… Arman says a lot of things… let’s see how this fight plays out.”

So the public picture is this: a five-round co-main between the No. 2 and No. 7 lightweights, widely framed as a next-challenger audition, that the UFC has not officially billed as a title eliminator and that White has not confirmed as one.

Where Gaethje sits

Gaethje is the undisputed lightweight champion after winning interim gold against Paddy Pimblett at UFC 324 (Jan. 24, 2026) and unifying against Ilia Topuria at UFC Freedom 250 (June 14, 2026).

In late August he told SI he still could not punch, that both hands remained hurt from the White House fight, and that he planned to “enjoy being the champion for the rest of the year” after two fights in the first six months — with a deeper decision coming later. That is rest-of-2026 inactivity and a 2027 return window in his own words, not a signed 2027 defense date.

White and UFC.com have not published a statement ruling out an interim lightweight title while Gaethje sits. What is true on the calendar: he is undisputed, no interim lightweight title fight is booked on the published 2026 schedule, and White will not even confirm that Tsarukyan–Ruffy is a No. 1 contender bout.

Rest of the card

Thirteen fights are announced. Beyond the title fight and five-round lightweight co-main, nothing else is officially billed as a title fight or No. 1 contender bout.

Notable names for depth, not as official eliminators: Patricio Pitbull vs. Dooho Choi; Renato Moicano vs. Brian Ortega; Alonzo Menifield vs. Iwo Baraniewski; Marlon Vera vs. Charles Jourdain; Casey O’Neill vs. Eduarda Moura. Heavyweight prospect Gable Steveson also appears on the prelims.

Bottom line for fight week

Van vs. Pantoja 2 is a clear championship rematch built on a 26-second title change and a rare reclaim path if Pantoja wins. Tsarukyan vs. Ruffy is a five-round ranked lightweight co-main that fighters and some outlets are selling as the next step toward Gaethje — and that White is leaving unsettled until the fight is over.