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UFC 331: Van vs. Pantoja 2FeatherweightPrelims
Michael Aswell Jr.WINNER
Michael
Aswell Jr.
25 yrsElo 1520*UFC debut
VS
JooSang Yoo
JooSang
Yoo
1-1UFC
32 yrsElo 1480*
Final: Michael Aswell Jr. by S-DEC
Who wins
Claude
60%
Yoo
GPT
61%
Yoo
Elo
56%
Aswell
1520 vs 1480
Tale of the tapeUFC averages
5'8" Height 5'7"
69" Reach 71"
Orthodox Stance Orthodox
7.60 Landed / min 6.36
7.03 Absorbed / minlower better 4.99
42% Strike accuracy 58%
52% Strike defense 56%
0.24 Takedowns / 15 n/a
25% TD accuracy 0%
55% TD defense 50%
Small sample: Michael Aswell Jr., 0 UFC fights; JooSang Yoo, 2 UFC fights.
How it ends
Claude: KO/TKO 37%Claude: Submission 5%Claude: Decision 58%
58%Decision
Claude calls Decision
KO/TKO 37%Submission 5%Decision 58%
GPT: KO/TKO 35%GPT: Submission 3%GPT: Decision 62%
62%Decision
GPT calls Decision
KO/TKO 35%Submission 3%Decision 62%
Formnewest first
Michael Aswell Jr.
No UFC fights
JooSang Yoo350 days out
L
Daniel Santos
KO/TKO Punch · 2025-10-04
W
Jeka Saragih
KO/TKO Punch · 2025-06-07
Why
Claude
JooSang Yoo
60% · Decision
  • Yoo's 58% striking accuracy versus Aswell's 52% striking defense, the more precise puncher is facing the more hittable target
  • Aswell has lost four of his last five, all by decision, indicating he consistently loses close striking rounds despite durability
  • Yoo's 337-day layoff following a KO loss is a material rust and confidence risk that keeps confidence at 60 rather than higher
  • Aswell averages only 0.24 takedowns per fight at 25% accuracy, so he cannot change the fight's phase if he is outstruck at range
Write-up

Aswell's dataCompleteness block says debut, but his log shows four UFC-era bouts and a DWCS appearance, so again the per-minute numbers are small-sample. Still, the picture across those fights is consistent: he is 1-4 in that stretch with four decision losses (Bolanos, Riley, Oki, Grad), and his stats show a fighter who trades at nearly even volume (7.60 landed vs 7.03 absorbed) with just 52% striking defense. He is durable, never finished in that log, but he loses rounds because he gets hit as often as he hits. Yoo is the more efficient striker at 58% accuracy and a positive +1.37 differential, and he showed real one-punch power stopping Jeka Saragih in the first round. The concern with Yoo is the 337-day layoff following his own KO loss to Daniel Santos, which exposed his 56% defense against a sharp counter-puncher. Aswell is not that kind of puncher, his one finish came against a faded Lucas Almeida, so the matchup favors Yoo landing the cleaner, more accurate shots over three rounds while Aswell's durability carries him to the bell. Yoo's two-inch reach edge and precision should win the exchanges; Aswell's 0.24 TD average shows he has no grappling escape hatch when the striking goes against him.

GPT
JooSang Yoo
61% · Decision
  • Yoo leads striking accuracy 58% to 42% and defense 56% to 52%.
  • Yoo has a +1.37 significant-strike differential versus Aswell's +0.57.
  • Aswell lands more strikes per minute, 7.60 to 6.36, but absorbs more, 7.03 to 4.99.
Write-up

Yoo's higher striking accuracy, stronger defense and better strike differential favor him in a predominantly standing matchup. Aswell's greater output provides a credible path to winning rounds, but he also absorbs substantially more strikes. Limited grappling activity supports a striking-led decision; missing sample sizes and reliable finish histories limit confidence.