Michael Aswell Jr. took a split decision off JooSang Yoo to stop his own slide
Aswell went in as the underdog at 39c (+170), was offered as low as 31c during the fight, and came out with two of the three cards.
By ExclusiveTuna · UFC 331: Van vs Pantoja 2 · Crypto.com Arena, Los Angeles
Michael Aswell Jr. beat JooSang Yoo by split decision at UFC 331 on September 19, 2026, at Crypto.com Arena in Los Angeles. The featherweight prelim went the full three rounds, ending at 5:00 of round three, with scorecards of 28-29, 29-28 and 29-28. Aswell had opened as the underdog at 39c (+170).
The short version
- Michael Aswell Jr. beat JooSang Yoo by Decision (split), round 3, 5:00
- Prelims, Featherweight, 3 rounds
- Closing line: Michael Aswell Jr. +170, JooSang Yoo −205
- Michael Aswell Jr. traded at 39¢ before the fight and settled at 100¢
- Scorecards: 28-29, 29-28, 29-28
What happened
The featherweight prelim went the distance and the judges split it. Two cards came back 29-28 for Michael Aswell Jr., one read 28-29 for JooSang Yoo, and the fight was scored at 5:00 of round three. Nothing was settled early. Aswell was the underdog on the board before the opening bell, and the live market moved against him before it moved back.
Aswell is 25 and fights out of Houston. He came in at 11-5 and on a two-fight losing streak, which is usually the run that puts a roster spot in question. Yoo is 32, from South Korea, and went 8-0 on the Korean regional circuit before he got to the UFC. He arrived at 9-1. He leaves at 9-2, and both of those losses are back to back.
The win moves Aswell to 12-5 and ends the slide. Yoo now carries a second defeat on a record built largely on a perfect regional run, and it came by a single card. CBS listed this bout at middleweight. It was a featherweight fight, three rounds, on the prelims. The honest summary is that the pre-fight price had it close and it was close.
What the market did
The lowest trade printed at 30¢ and the best offer was 31¢, so this one is close to honest for a buyer.
Aswell traded at 39c (+170) before the fight, with Yoo the favourite at -205. The cheapest a buyer could have paid while the bout was live was 31c at 23:42Z on September 19, so at its worst the live market gave him roughly a three in ten read. It settled at 100c when the split decision was announced, the same as every winner on the card.
A 30c trade printed, a cent under the best offer, so the low is close to honest for a buyer here. The whole path lived inside eight cents. No knockdown, no scramble, nothing that forced a hard reprice. That is the signature of a fight decided on rounds rather than moments. Whatever edge existed here sat in the pre-fight number, not in anything that happened while the fight was live.
What each stake returned
| Stake | Contracts at 39¢ | Returned | Contracts at 31¢ | Returned |
|---|---|---|---|---|
| $100.00 | 256 | $256.00 | 322 | $322.00 |
| $200.00 | 512 | $512.00 | 645 | $645.00 |
| $5,000.00 | 12,820 | $12,820.00 | 16,129 | $16,129.00 54% of the minute |
The right half is the best offer that existed while the fight was live. Getting filled there still depends on size being available, which a candlestick cannot tell you. Where a stake would have been a large share of that minute's entire volume, the table says so rather than printing a number nobody could have collected. Volume on that minute was 29,875 contracts. Returns are gross of the Kalshi trading fee and are hindsight: they show what a price paid once the result was known, not what anyone should stake next.
The bout, on the record
| Result | Michael Aswell Jr. def. JooSang Yoo |
|---|---|
| Method | Split decision, 3 rounds |
| Scorecards | 28-29, 29-28, 29-28 |
| Weight class | Featherweight, prelims |
| Pre-fight price | 39c (+170) |
| Cheapest you could buy | 31c, 23:42Z Sept 19 |
| Lowest trade printed | 30c, one cent under the best offer |
| Settlement | 100c |
Quick answers
Who won Aswell vs Yoo at UFC 331?
Michael Aswell Jr. won by split decision after three rounds. The official cards were 28-29, 29-28 and 29-28. The fight ran to 5:00 of round three on the prelims at Crypto.com Arena in Los Angeles.
Was Michael Aswell Jr. the favourite?
No. Aswell was the underdog. His contract traded at 39c (+170) before the bout while JooSang Yoo closed at -205. The market had Yoo ahead going in and two of the three judges disagreed.
How low did Aswell's contract go during the fight?
The cheapest a buyer could have paid was 31c at 23:42Z on September 19, eight cents under its pre-fight price. A 30c trade printed a cent lower, which was a seller hitting the bid. That was the weakest read the market gave him across the three rounds. It settled at 100c once the decision came in.
All 12 bouts and the full UFC 331 results board
Sources and method
Results and scorecards from the official UFC event pages, cross-checked against Sherdog and theScore. Closing moneylines from BestFightOdds and DraftKings, captured after the event. Contract prices are Kalshi one-minute candlesticks on the KXUFCFIGHT series, market KXUFCFIGHT-26SEP19ASWYOO-ASW. Where sources disagree on a finish time or a method, both readings are carried on this page rather than resolved silently. We aren't affiliated with the UFC or Kalshi.