UFC 331: Tsarukyan vs. Ruffy Decides Who Waits at 155

Arman Tsarukyan is ranked No. 2 at lightweight and has been for a while now, and that used to mean something specific: next in line, one signature win from a title shot that was always described as inevitable. It doesn't mean that anymore. Ilia Topuria jumped in from featherweight, went straight to No. 1, and turned Tsarukyan's spot from "next" into "still waiting." The UFC 331 co-main event on September 20 against Maurício Ruffy isn't Tsarukyan defending a place in line. It's him trying to prove there's still a line worth being second in.

The résumé that got him here

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Arman Tsarukyan is 10-2 in the UFC, and the two losses are both old enough to need context: a 2019 promotional debut loss to Islam Makhachev by unanimous decision, and a five-round unanimous decision loss to Mateusz Gamrot in 2022 that Tsarukyan has spent years insisting he won. Since Gamrot, he hasn't lost. He beat Damir Ismagulov by unanimous decision, finished Joaquim Silva by TKO, knocked out Beneil Dariush in the first round at the end of 2023, then took a split decision over Charles Oliveira at UFC 300, a former lightweight champion, in April 2024. Our Power Index had that Oliveira fight as close to a coin flip beforehand (39.3 percent in Tsarukyan's favor) and he won it anyway on the cards.

Then came the part that actually explains why he's still sitting at No. 2 instead of getting a title shot: nineteen months of nothing, until a second-round submission of Dan Hooker last November got him back in the cage at all. A win over a stylistically difficult veteran doesn't answer the question that matters, which is whether the layoff cost him anything against the murderers' row above him. Ruffy is the first live test of that since Oliveira.

The other guy has done more with less

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Maurício Ruffy is 6-1 in the UFC and sits at No. 10, which undersells what he's actually done since the one loss on his record. Benoit Saint Denis submitted him in September 2025, the kind of setback that can stall a hot prospect's climb for a year. Instead, Ruffy answered with two finishes in a row against the kind of names that actually move a ranking: a second-round KO of Rafael Fiziev in January, then a first-round finish of Michael Chandler, a former interim champion and one of the more recognizable names at 155, this past June. Our Power Index has tracked the swing in real time: Ruffy's rating sat at 1,745 the night Saint-Denis beat him, climbed to 1,783 after Fiziev, and sits at 1,814 now after Chandler, a 69-point jump across two fights while his official rank has been frozen at No. 10 since June. The board hasn't caught up to the finishes yet.

That gap between rank and rating is the whole fight. Tsarukyan is the guy who has been good longer. Ruffy is the guy who has been better lately, at least by the numbers that update after every finish instead of on a rankings panel's schedule.

What either outcome actually does

A Tsarukyan win doesn't get him a title shot on September 21. Topuria still sits at No. 1, still owns the kind of crossover star power that makes him the UFC's next booking regardless of what happens at Crypto.com Arena, and Justin Gaethje is defending a belt he's shown no interest in losing without a fight. What a Tsarukyan win does is keep him the most credible name behind Topuria heading into whatever comes next at 155, and it answers the only question worth asking about him right now: whether nineteen months on the shelf plus one second-round finish over Hooker adds up to a fighter who can still beat someone ranked and finishing people.

A Ruffy win is the more interesting outcome for the division, because it doesn't just move him up a spot. Beating the No. 2 lightweight in the world, a man who's beaten Oliveira and Dariush inside the last two years, is the kind of result that skips lines instead of standing in them. Ruffy would walk out of Los Angeles as a plausible top-five lightweight with three straight finishes over names that matter, at a weight where finishes over ranked opposition are the only currency that moves a division stuck waiting on its champion.

The number our model can't give you yet

UFCalendar's AI prediction model hasn't priced this card yet; those numbers land closer to fight week. What's on the board right now is the shape of two very different climbs meeting at the same rank-adjacent altitude: one fighter who got there early and has been parked since, one who got there late and is still accelerating. The judges won't score momentum, and Tsarukyan's own last outing was a finish, not a coin flip either. But whoever's hand gets raised on September 20 is the one who gets to walk into the wide-open space behind Topuria and Gaethje, and the other one goes back to whatever line forms next.

Lock in your own read at the pick'em before the first bell, and follow the rest of the UFC 331 card, title fight included, live on fight night.