September 12, 2026 · Desert Diamond Arena, Glendale, Arizona, United States
Aldrich
15-7-0
#15 FlyweightDenver, Colorado | 33 years old
Tarin
8-0-0
UnrankedMexico City, Mexico | 21 years old
Accuracy Against Output
Aldrich has 17 octagon fights and a knack for winning close cards. Tarin is 21, 8-0, and throws nearly twice as many strikes per minute.
Conviction
Conviction 5, and no higher. The number holding the pick up is the accuracy band: everyone who landed near 50% on Aldrich won clearly, Lipski at 49% and Barber at 50%, and everyone who landed 30% lost the cards, Lee and Horth. Tarin debuted at 47%. Except that 47% came out of a single fight, against a 6-2-1 opponent who landed 105 strikes right back in her face, and that's where the calibre caveat between Tarin and Aldrich bites: the Mexican built her 8-0 at Budo Sento, Combate Global and TNX, while the American has 17 octagon fights and has already shared the cage with Blanchfield, Barber, Gillian Robertson and Lipski. Add what Tarin herself said this week, about polycystic ovary syndrome, metabolic stress and a body that stopped responding to the cut, plus the fact that she has yet to make 125 on a UFC scale, and there are two real variables pushing against the pick. This is a pick on output, not on certainty. The line opened and has drifted toward, which means the money is moving the other way, and that counts too.
Conviction 5, and no higher. The number holding the pick up is the accuracy band: everyone who landed near 50% on Aldrich won clearly, Lipski at 49% and Barber at 50%, and everyone who landed 30% lost the cards, Lee and Horth. Tarin debuted at 47%. Except that 47% came out of a single fight, against a 6-2-1 opponent who landed 105 strikes right back in her face, and that's where the calibre caveat between Tarin and Aldrich bites: the Mexican built her 8-0 at Budo Sento, Combate Global and TNX, while the American has 17 octagon fights and has already shared the cage with Blanchfield, Barber, Gillian Robertson and Lipski. Add what Tarin herself said this week, about polycystic ovary syndrome, metabolic stress and a body that stopped responding to the cut, plus the fact that she has yet to make 125 on a UFC scale, and there are two real variables pushing against the pick. This is a pick on output, not on certainty. The line opened and has drifted toward, which means the money is moving the other way, and that counts too.
THE DECIDING POINT
Volume Doesn't Beat JJ. Accuracy Does.
JJ Aldrich doesn't lose to volume. She loses to volume that lands. In March 2025, Andrea Lee threw 175 significant strikes at her and landed 53, a 30% clip, and Aldrich took 30-27 on two of the three cards. In April 2026, Jamey-Lyn Horth threw 230 and landed 70, also 30%, and the American walked out of Winnipeg with three 29-28 scorecards despite connecting on fewer strikes than her opponent. Now flip the switch. Ariane Lipski landed at 49% in 2023 and swept her 30-27 across the board. Maycee Barber landed at 50% in 2019 and ended it in the second round. Same math, seven years running. Regina Tarin debuted in the UFC at 47%. That's 114 significant strikes on 239 attempts across 15 minutes, on three days' notice, at a 130-pound catchweight, against an opponent she'd never studied. She threw 79 of those attempts in round one alone. If that number falls to the Lee-and-Horth range of 30%, the veteran wins this comfortably. If it holds where it is, Aldrich becomes the Aldrich of 2019 and 2023. The rest is the usual ledger when the kid meets the veteran. Tarin is 21, 8-0, and has faced exactly one opponent at this level in her life. Aldrich is 33, has 17 octagon fights, and has shared the cage with Blanchfield, Barber, Gillian Robertson and Lipski. One of them knows more. The other one throws more.
JJ Aldrich doesn't lose to volume. She loses to volume that lands. In March 2025, Andrea Lee threw 175 significant strikes at her and landed 53, a 30% clip, and Aldrich took 30-27 on two of the three cards. In April 2026, Jamey-Lyn Horth threw 230 and landed 70, also 30%, and the American walked out of Winnipeg with three 29-28 scorecards despite connecting on fewer strikes than her opponent. Now flip the switch. Ariane Lipski landed at 49% in 2023 and swept her 30-27 across the board. Maycee Barber landed at 50% in 2019 and ended it in the second round. Same math, seven years running. Regina Tarin debuted in the UFC at 47%. That's 114 significant strikes on 239 attempts across 15 minutes, on three days' notice, at a 130-pound catchweight, against an opponent she'd never studied. She threw 79 of those attempts in round one alone. If that number falls to the Lee-and-Horth range of 30%, the veteran wins this comfortably. If it holds where it is, Aldrich becomes the Aldrich of 2019 and 2023. The rest is the usual ledger when the kid meets the veteran. Tarin is 21, 8-0, and has faced exactly one opponent at this level in her life. Aldrich is 33, has 17 octagon fights, and has shared the cage with Blanchfield, Barber, Gillian Robertson and Lipski. One of them knows more. The other one throws more.
Truth A
Aldrich has already proven she can swallow volume. Lee threw 175 at her and landed 53. Horth threw 230 and landed 70. Both of them lost on the cards, and the second one lost at home.
Truth B
But when the volume lands near 50%, the whole equation changes. Lipski hit 49% and won 30-27. Barber hit 50% and ended it in round two. Tarin debuted at 47%.
Tale of the Tape
Twelve years between them
Aldrich is two inches shorter and still owns an inch-and-a-half reach edge
A southpaw-vs-southpaw fight, with no open-stance puzzle to solve
The most brutal line on the tape
Current Form
JJ Aldrich
Took three 29-28 cards in Winnipeg despite landing fewer, 50 significant strikes to 70. Clearly dropped round one and only found her range in the third, going 27 of 60.
Unanimous DecisionHer best recent work. Made Lee miss on 70% of 175 attempts and landed 74 of 137 at 54%, adding two takedowns. Cards read 30-27, 30-27, 29-28.
Unanimous DecisionPiled up 5:09 of control time to Hardy's one second and still lost 29-28 across the board. Fence control without damage doesn't move judges.
Unanimous DecisionAnother tight decision where she landed fewer, 65 to 67, and took the cards on aggression and cage real estate.
Unanimous DecisionHer only finish in 17 UFC fights. Got taken down, reversed, climbed to the back and closed it with elbows at 4:49 of round two, with 5:11 of control.
TKO R2Two straight wins and the No. 15 spot in the division, but the picture is colder than the streak. Against Jamey-Lyn Horth in April she landed 50 significant strikes to 70 and still walked out of Winnipeg with three 29-28 cards, the home crowd silent. The genuinely good performance was the one before it, over Andrea Lee: 74 of 137 at 54% accuracy, two takedowns, and 30-27 on two of the three cards. Thirteen months of inactivity sat between them. At 33, with 17 octagon fights on the clock, she's the same fighter she's always been: competitive in any round, with nothing in the bag to end the argument before the final horn.
Regina Tarin
UFC debut taken on three days' notice at a 130-pound catchweight. Landed 114 of 239 significant strikes, 79 attempts in round one alone, and took two 30-27 cards. Fight of the Night.
Unanimous DecisionCo-main event at a TNX show in Costa Rica. Landed an overhand right and flattened her opponent just past the two-minute mark.
KO R1Stopped an Ultimate Fighter alum at 4:16 of round two on a Combate Global card. The best resume she faced before the UFC.
TKO R2Won the inaugural Budo Sento bantamweight title with a TKO at 2:27 of round four in a scheduled five-rounder. The only time in her career a fight has gone past 15 minutes.
TKO R4Combate Global's Mexico vs. Japan card. Settled it with punches in 1:55, the third of her four regional knockouts.
TKO R1Eight wins in eight fights, six by finish, and a UFC debut that reads like a backstage story: she replaced Sofia Montenegro on three days' notice at a 130-pound catchweight, beat Ernesta Kareckaite 30-27, 30-27, 29-28, and left Arena CDMX with a $100,000 Fight of the Night check. She landed 114 significant strikes, 79 attempts in round one alone. At 21 she's one of the youngest fighters on the entire UFC roster, an IMMAF Youth World silver medalist from 2022 and a BJJ purple belt. What nobody has seen yet is what she looks like with a full camp behind her, and that's what lands in Glendale.
Level of Competition
The resume gap here is enormous and there's no dressing it up. Aldrich has 17 octagon fights dating to 2016 and has faced Erin Blanchfield, Maycee Barber, Gillian Robertson, Ariane Lipski and Andrea Lee. Tarin has one UFC fight and built her 8-0 at Budo Sento, Combate Global and TNX, beating unranked opponents on the Mexican and Central American circuit. The caveat cuts both ways, though: Aldrich's own level of opposition has slid badly, her last five were all against unranked fighters, and that's why she sits at No. 15 and not higher. Neither woman has ever faced a top-five opponent in this division, and there isn't a single common name between them.
Statistical Comparison
Sig. Strikes per Minute
Nearly double for Tarin, but her number comes out of a single UFC fight
Striking Accuracy (%)
A dead heat, and it's the most important number in the fight
Strikes Absorbed per Minute
Both get hit plenty, and the Mexican gets hit a lot more
Striking Defense (%)
A small edge for Aldrich, and it's what her whole path rests on
Takedowns per 15 Min
Takedown Accuracy (%)
Aldrich went 0-for-12 against Lipski, so the takedown is no reliable plan B for her
Takedown Defense (%)
Tarin's 50% comes from two attempts faced, a sample that tells you almost nothing
Submissions per 15 Min
Aldrich leads in 3 categories · Tarin leads in 4
Win & Loss Distribution
Wins
KO/TKO
Submission
Decision
Two opposite ways of winning a fight. Aldrich has 12 of her 15 wins by decision, 80%, and zero submissions across her entire professional career. Her only TKO in the UFC came against Liang Na in 2023, elbows from back control after she reversed a takedown, at 4:49 of round two. Tarin has six finishes in eight wins, four by knockout and two by rear-naked choke, and four of them inside the first round. Except that ledger was written on the regional scene: in the octagon she needed all 15 minutes and never put her opponent down across 114 landed strikes. The method in this fight lives in the gap between what she does at Budo Sento and what she showed in the UFC.
Losses
KO/TKO
Submission
Decision
This is Aldrich's floor, and it's tougher than it looks. Seven losses, and only one by strikes: Maycee Barber, March 2019, seven years ago. The two submission losses are Erin Blanchfield's standing guillotine in 2022 and a technical rear-naked choke to Jamie Moyle at Invicta in 2015. That means 57% of her defeats came on the cards, and 14 of her 17 UFC fights have gone the full 15. Beating Aldrich almost always runs through the judges, which is precisely why betting the Mexican's knockout is the trap of the night. Tarin has no professional loss to read, which is zero information rather than proof of durability: the only record of anyone beating her in a cage is an amateur TKO to Joceline Saucedo in March 2022, inside two minutes, four and a half years ago and at a level that doesn't speak to this one. A zero-loss sample isn't a proven chin, it's an absence of data.
Skills Profile
Aldrich
vs
Tarin
Striking at Range
+1 Aldrich
Aldrich carries an inch-and-a-half reach edge and her best work is counter-punching: 54% accuracy against Andrea Lee, who threw 175 and landed 53.
Volume & Pressure
+4 Tarin
7.60 significant strikes per minute to 3.92, and 239 attempts across 15 minutes in her debut against the 149 Aldrich threw at Horth.
Knockout Power
+2 Tarin
Four knockouts in eight wins for Tarin against three in 15 for Aldrich, but zero knockdowns for the Mexican in the 15 minutes she's spent in the octagon.
Striking Defense
+1 Aldrich
61% striking defense for Aldrich against 57%, and 4.34 strikes absorbed per minute against 7.00. Both get hit, the Mexican gets hit more.
Grappling & Clinch
+2 Aldrich
67% takedown defense for Aldrich, who reversed and finished Liang Na from the back and went 4 of 7 on takedowns against Cortney Casey. Tarin has faced two attempts in the UFC, a sample that says nothing.
Cardio (3 Rounds)
+1 Aldrich
Fourteen of Aldrich's 17 UFC fights went the full 15 minutes. Tarin has been past 15 once in her career, in the Budo Sento title fight, and hasn't made 125 on a UFC scale yet.
On paper Aldrich takes four of the six categories, and that's honest: she's more accurate, defends better, is longer, and owns 15-minute mileage the other woman doesn't have. The problem is that the one category Tarin genuinely owns, output, is the one that has decided nearly every loss on the American's record. This isn't a fight about who knows more. It's a fight about who imposes her own rhythm first.
Final Prediction
The Thesis
Conviction5/10The thesis is: Regina Tarin wins because she produces nearly double the significant strikes per minute, 7.60 to 3.92, and debuted in the UFC landing at 47%, the accuracy band that has already swept Aldrich before, with Ariane Lipski landing 49% and winning 30-27 and Maycee Barber landing 50% and ending it in round two, because Aldrich absorbs 4.34 strikes per minute and has no reliable plan B, having gone 0-for-12 on takedown attempts against Lipski and carrying 25% career takedown accuracy, and because the Mexican is 12 years younger, two inches taller, and coming off two 30-27 cards in a debut she took on three days' notice.
The thesis is: Regina Tarin wins because she produces nearly double the significant strikes per minute, 7.60 to 3.92, and debuted in the UFC landing at 47%, the accuracy band that has already swept Aldrich before, with Ariane Lipski landing 49% and winning 30-27 and Maycee Barber landing 50% and ending it in round two, because Aldrich absorbs 4.34 strikes per minute and has no reliable plan B, having gone 0-for-12 on takedown attempts against Lipski and carrying 25% career takedown accuracy, and because the Mexican is 12 years younger, two inches taller, and coming off two 30-27 cards in a debut she took on three days' notice.
The path is Tarin closing the distance from the opening minute, turning every round into an output contest where she throws 70 to 80 strikes, and arriving in round three ahead. It breaks down if the cut to 125 pounds, her first on a UFC scale and made with a public history of polycystic ovary syndrome and metabolic stress, drains her engine, or if Aldrich repeats the read she used on Andrea Lee, when she made her opponent miss on 70% of 175 attempts while landing 54% of her own.
What Breaks This Pick
- 01
If Aldrich makes Tarin miss the way she made Andrea Lee miss, 53 landed on 175 thrown, the whole output thesis evaporates: volume that doesn't land doesn't win rounds.
- 02
If Tarin arrives in round three breathing through her mouth, the 125-pound cut collected its bill and Aldrich, who has gone the full 15 in 14 of her 17 UFC fights, inherits the fight.
- 03
If the American lands the takedowns and control she used on Cortney Casey, 4 of 7 takedowns and 5:44 of control time, or reverses to the back the way she did on Liang Na, the cards flip her way.
- 04
If the southpaw-vs-southpaw look stalls the exchanges and the fight turns into a jab contest at range, Aldrich's reach edge and 61% striking defense start deciding rounds.
Underdog Path
Aldrich doesn't try to win the output fight, she tries to win the accuracy fight. She works behind the southpaw jab, uses her inch-and-a-half reach edge to make Tarin come to her, and charges the Mexican for every entry with clean counters. That's exactly what she did to Andrea Lee in March 2025: Lee threw 175 significant strikes and landed 53 at 30%, while Aldrich landed 74 of 137 at 54% and took 30-27, 30-27, 29-28. In rounds two and three, when the weight cut comes due, she mixes in the takedown and the clinch on the fence, controls, and hands the judges exactly the kind of fight that has already rewarded her four times in the UFC even while she landed less than her opponent.
Required Conditions
- Get through the first five minutes without accumulating damage: Tarin threw 79 strikes in round one alone against Kareckaite, and Aldrich landed at 16% in round one against Horth and 30% in round one against Barber
- Hold her accuracy above 45%, the number she produced against Andrea Lee and failed to produce against Barber or Horth
- Pull Tarin out of the clinch, where the Mexican went 23 of 30 in her debut, and force the fight to happen at jab range
- Reach round three with the fight even, which is where the first 125-pound UFC cut can show up and where the American has been 14 times in 17 fights
— Precedent: Aldrich vs. Andrea Lee (March 1, 2025): the opponent threw 175 significant strikes, landed just 53, and lost 30-27 on two of the three cards while Aldrich connected on 54% of her own. It's the exact template for how the veteran takes a volume fight without winning the output battle.
Verdict
Winner
Regina Tarin
Method
Decision
Most Likely
- 01
Winner
Regina Tarin
Tarin because she produces 7.60 significant strikes per minute to Aldrich's 3.92 and debuted landing at 47%, the band that has swept the American twice. The market opened and has walked back toward, meaning the money is on the veteran, so this is a reduced-stake play and not a confidence play. Breaks if Tarin misses the way Andrea Lee missed, 53 of 175.
- 02
Underdog Winner
JJ Aldrich
Aldrich because she's the only one of the two with a proven answer to a volume fight: against Andrea Lee she held her opponent to 30% and landed 54% of her own. The market is pricing 21 years old and an 8-0 record and paying almost nothing for 17 octagon fights. Breaks if she gives away round one the way she did against Horth and Barber.
- 03
How It Ends (Either Fighter)
Fight goes to decision
The distance because Aldrich has gone the full 15 in 14 of her 17 UFC fights and has been stopped by strikes exactly once in 22 pro bouts, and because Tarin, in her only test at this level, landed 114 strikes without a single knockdown. The market is pricing the Mexican's 75% regional finish rate rather than what she actually showed in the octagon. Breaks if Aldrich, at 33 and with this mileage, agrees to stand and trade in round three.
Most Likely Outcome
Fight goes to decision
It's the firmest read on the card and it's worth more than the winner. On the winner I'm with Tarin, but at conviction 5, with the underdog path at 45% and the line moving against me, that means a small stake or none at all. The distance has two resumes behind it: Aldrich hasn't been stopped by strikes since March 2019, and Tarin didn't drop anyone in the only 15 minutes she's spent in the octagon.
Stats That Matter
47%
Tarin's accuracy in her UFC debut, 114 of 239 significant strikes
Lipski (49%) and Barber (50%) beat Aldrich comfortably; Lee (30%) and Horth (30%) lost on the cards
ZERO
knockdowns for Tarin across 15 minutes in the octagon
Four regional knockouts in eight wins that haven't shown up at UFC level yet
10 of 17
UFC fights in which Aldrich landed FEWER strikes than her opponent
She won four of them anyway, and that's exactly where the veteran's chance lives
The Trap
Tarin by knockout
It's the obvious bet on this card and it's where the easy money goes. The public sees 8-0, four knockouts, a nickname like Kill Bill and four first-round wins, and forgets two things. First: all of that was built at Budo Sento, Combate Global and TNX, and in the octagon she landed 114 strikes across 15 minutes without putting Kareckaite down once. Second: Aldrich has been stopped by strikes exactly once in 22 pro fights, by Maycee Barber in March 2019. That's seven years without going down. If you want Tarin, take the moneyline or the cards, not the finish.
It's the obvious bet on this card and it's where the easy money goes. The public sees 8-0, four knockouts, a nickname like Kill Bill and four first-round wins, and forgets two things. First: all of that was built at Budo Sento, Combate Global and TNX, and in the octagon she landed 114 strikes across 15 minutes without putting Kareckaite down once. Second: Aldrich has been stopped by strikes exactly once in 22 pro fights, by Maycee Barber in March 2019. That's seven years without going down. If you want Tarin, take the moneyline or the cards, not the finish.
COLISEUM - Statistical and tactical analysis. Data sourced from ufcstats.com and public sources.
JJ Aldrich vs Regina "Kill Bill" Tarin | Noche UFC: Silva vs Delgado | September 12, 2026 | Desert Diamond Arena, Glendale, Arizona, United States
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