Michael Aswell vs JooSang Yoo Prediction & Fight Preview - 9/19/2026
Updated September 18, 2026
Updated September 18, 2026
Michael Aswell Jr. and JooSang Yoo meet in a featherweight preliminary matchup at UFC 331 on Saturday, September 19, 2026, at Crypto.com Arena in Los Angeles. Aswell enters at 11-5 after consecutive decision losses, while Yoo carries a 9-1 record but has not fought since suffering the first defeat of his career in October 2025. The statistics paint this as a high-output striking matchup, yet Aswell has far more UFC cage time and has never been stopped as a professional, while Yoo has produced considerably more power in a much smaller MMA sample size.
Why Our Model Sees Value:
“Yoo’s explosive finishes and superior raw efficiency numbers deserve respect, but his UFC statistical sample consists of only 2 fights and less than 6 minutes of total cage time. Aswell has shown he can sustain a fast striking pace across 15 minutes against UFC opposition, and all 5 of his professional defeats have gone to decisions rather than stoppages.”
A Question Of Pricing
There is still a strong case for Yoo being the more likely winner, which is reflected in a model projection that leaves Aswell below 50%. The disagreement is with the size of the current price rather than the direction of the favorite. At 34¢, Aswell only needs to win slightly more than 1 out of every 3 comparable fights to justify the prediction. My projection puts him at 38%, leaving a 4% edge.
Aswell Can Extend This Fight
The Aswell side is built primarily around durability, activity, and volume. He lands 7.60 significant strikes per minute and has gone the full 15 minutes in each of his last 2 fights. Against Gaston Bolanos in June, Aswell landed 105 significant strikes despite losing a unanimous decision. Against Luke Riley in March, he again reached the scorecards while maintaining an aggressive pace against an unbeaten opponent. Yoo is the cleaner and more dangerous single-shot striker, but Aswell's ability to extend the fight creates more opportunities for Yoo's defensive questions to surface.
Recommended Prediction:
Aswell to Win
Current Market Price:
34¢
Model Win Probability:
38%
Market-Implied Probability:
34%
Model Edge:
4%
Buy Up To:
37¢
Model Trade Confidence:
70/100
Statistic | Michael Aswell | JooSang Yoo |
|---|---|---|
Age | 25 | 32 |
Height | 5'8" | 5'7" |
Reach | 69" | 71" |
Stance | Orthodox | Orthodox |
Record | 11-5 | 9-1 |
Aswell's record does not tell the whole story of his recent run. He has dropped consecutive unanimous decisions to Luke Riley and Gaston Bolanos, leaving him 1-3 across his first 4 UFC appearances. His lone UFC victory came against Lucas Almeida in October 2025, when Aswell scored a first-round stoppage at 1:42. Both of his 2026 losses went the full distance, continuing a career-long trend in which opponents have had difficulty finishing him.
The Bolanos fight is particularly useful for assessing this matchup. Aswell was credited with 105 significant strikes compared with 87 for Bolanos, yet Bolanos won all 3 scorecards 29-28. That result reinforces both the appeal and the risk of backing Aswell in UFC predictions. He can generate plenty of offense, but volume alone does not guarantee he wins rounds if the opponent lands the cleaner, harder shots.
Yoo's UFC résumé is much shorter. He arrived with an undefeated record and needed only 28 seconds to knock out Jeka Saragih in June 2025. His second UFC appearance went very differently. Daniel Santos stopped Yoo with strikes just 21 seconds into Round 2 at UFC 320 in October 2025. Yoo has not competed since that loss, so UFC 331 marks his first fight in nearly 12 months.
Aswell operates at an unusually high pace. UFC's current statistics credit him with 7.60 significant strikes landed and 7.03 absorbed per minute. His significant-strike defense sits at 52%, which explains why his fights often become busy exchanges rather than clean technical contests. He wants to pressure and force his opponents to work constantly. That approach has produced 6 knockout wins, but it also leaves him available to be hit.
Yoo's numbers are impressive but need context because of the limited sample. He lands 6.36 significant strikes per minute with 58% accuracy while absorbing 4.99. His listed knockdown rate is 2.58 per 15 minutes, far above Aswell's 0.49. Yoo has recorded 4 knockout wins in 9 professional victories, and his UFC debut showed how quickly he can punish an opponent who gives him a clean countering opportunity.
That is the clearest danger for Aswell. He absorbs too much offense to assume he can walk Yoo down without consequences. Yoo also owns a reach advantage despite being listed an inch shorter, giving him another useful tool for intercepting Aswell's entries.
Neither fighter's UFC numbers suggest that wrestling will be the primary route to victory. Aswell averages 0.24 takedowns per 15 minutes with 56% takedown defense, while Yoo has yet to register a UFC takedown and owns 50% defense. Yoo does have a submission win on his professional record and holds a Brazilian jiu-jitsu purple belt, but his UFC performances have been overwhelmingly striking-based.
Unless one fighter uses wrestling specifically to disrupt the other's rhythm, prolonged striking exchanges appear to be the most likely shape of the fight. That should give Yoo opportunities to land the more damaging individual shots, but it also gives Aswell the chance to make this a higher-volume contest across 3 rounds.
Yoo should have his best success early, when his counters are sharp, and Aswell's pressure gives him openings. His reach, accuracy, and demonstrated knockout power are legitimate reasons for the market making him the favorite. If Aswell enters recklessly or repeatedly exchanges in the pocket without moving his head, Yoo has the tools to punish him.
The equation changes if Aswell gets through the opening exchanges without taking major damage. His recent fights provide far more evidence of how he operates deep into a 15-minute contest. He has continued throwing at a strong rate late in fights, and opponents have yet to stop him in 16 professional appearances. Yoo, by contrast, has only 2 UFC bouts, and neither reached the midpoint of Round 2.
That experience gap is the basis for taking Aswell at the current price rather than forecasting Yoo outright. Yoo remains my model's more likely winner at 63%, but 67¢ asks too much based on the available evidence. At 34¢, Aswell is priced below my estimated probability, making Aswell my prediction for UFC 331.