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UFC Vegas 121 · Main event · Bantamweight · 5 rounds
Rosas Jr. vs Barcelos: the grappler has grown into 135
Raul Rosas Jr. is 21, holds the highest control-time share the bantamweight division has ever recorded, and has not been held down for more than two and a quarter minutes in any fight since his only loss. Kalshi has him at 59¢, down from 64¢ when the market opened. We think the market is paying too much attention to the birth certificate and not enough to where this fight will be fought.
ExclusiveTuna Lead writer, UFC, MMA and boxing · See profile
Our position
Rosas Jr. at 59¢, with a sell order at 71¢.
- Entry
- 59¢
- Sell order
- 71¢
- If it fills
- +14.6%
- Most it can lose
- $99.54
- Scheduled
- 5 rounds
- Card
- Main event
The short version
- Kalshi has Rosas Jr. at 59¢ and Barcelos at 42¢, read Sep 26, 2026, about 2:00 PM PT
- Rosas Jr. holds the bantamweight record for share of fight time in control, 56.9 per cent
- He took Rob Font down 16 times in 18 attempts in March
- Opponents have controlled him for no more than 2:14 in any fight since his only loss
- Barcelos is 39, a former Brazilian wrestling champion, with 87 to 88 per cent takedown defence
Our plan on this fight
Graded: won at the 71¢ sell order$100.00 on YES Raul Rosas Jr. at 59¢, written to the ledger at 2:02 PM PT, three hours before the main card. That is 164 contracts for $99.54 with the entry fee inside the stake, and $99.54 is the most the position can lose. A sell order rests at 71¢, the desk’s rule of twenty per cent over entry. If a good first round carries the price there, the position is closed and that is the whole trade. If it never trades there, the position rides to settlement.
Live Kalshi quote for the Rosas Jr. contract loads here.
What 71¢ is worth after both fees
The contract moves 20.3 per cent. The trade nets 14.6 per cent.
Held to settlement instead, a winning ticket returns $64.46 on $99.54 at risk and a losing one returns nothing. Both outcomes go on the ledger at the same size.
This position is on the ledger as 2026-09-26-26sep26rosbar-rosas-jr-exclusive-tuna and is graded after the fight whichever way it goes. Open the ledger
Desk positions on this game
Posted before the first bellEvery position was posted before the first bell. Each is graded on Kalshi’s own trade history after the game, on the result page. A tail is a second desk writer taking the same contract after the first plan went up; it grades on its own entry. All desk records
The fight happens where Rosas Jr. puts it
Most previews of this fight start with the age gap, and it is a real number: Barcelos turned 39 in May, Rosas Jr. turns 22 next month. But age is not how Rosas Jr. wins fights. He wins them on the mat, and on the mat his numbers are not a prospect’s numbers.
He has landed 32 takedowns in seven UFC fights, tied for fifth in bantamweight history. He has spent 56.9 per cent of his UFC fight time in control, which CBS Sports reports is the highest share the division has ever recorded. In March he took Rob Font down 16 times in 18 attempts, held him for 10 minutes and 5 seconds of a 15-minute fight, and won 30-27 on all three cards. Font is a 32-fight veteran. He was on his back in every round.
That is the whole case in one sentence: if Rosas Jr. can put Barcelos where he put Font, the age, the experience and the striking gap stop mattering, because none of them work from underneath.
A teenager when he arrived, a bantamweight now
Rosas Jr. signed with the UFC at 17 years and 11 months, the youngest in the company’s history, and his first professional fight was at featherweight. He has fought at 135 since May 2022. In December 2023 he told MMA Junkie that his body was growing and that each weight cut was a little more than the last. He weighed in at 136 on Friday. Barcelos made 135. Rosas Jr. is also the taller man, 5 ft 9 against 5 ft 7 and a half, with the same 67-inch reach.
The clearest trace of that growth is not on the scale, it is in what opponents can do to him. In his only loss, in April 2023, Christian Rodriguez controlled him for 7 minutes and 30 seconds, most of it in the second and third rounds after Rosas Jr. had spent himself on 16 takedown attempts. In the five fights since, opponents have controlled him for 0:00, 0:52, 0:00, 2:14 and 0:13. Font, a strong bantamweight, got 13 seconds.
We read that as a man who has grown into his frame and now wins the scrambles he used to lose. To be plain about the evidence: nobody has published a strength number, and the one quote about his body is from 2023. The control-time trend is measured. The reason for it is our reading.
What the one loss taught him
The Rodriguez fight is the template for how Rosas Jr. loses, so it is worth reading round by round. He won the first: three takedowns and four minutes of control. Then he went 0 for 5 on takedowns in the second and 0 for 3 in the third, Rodriguez took his back in the scrambles, and the significant strikes finished 29 to 2 against him.
The lesson was cardio and chain wrestling, and he has said as much, describing the wrestling he had then as something he learned in a month. Since that night he has won five straight, three of them over the full fifteen minutes, and the most any of those five opponents managed on top of him was 2 minutes and 14 seconds.
Barcelos is the hardest version of this test
This is not a pick against a soft opponent, and anyone buying Rosas Jr. should know why the price has come in. Barcelos is a five-time Brazilian national wrestling champion and a black belt under his father. His takedown defence is 87 to 88 per cent, and in his last ten UFC fights he was taken down four times in total. No wrestler has beaten him from top position in the UFC: his four UFC losses were a knockout and three decisions, none of them built on top control.
He is also on a five-fight win streak, including an upset of Payton Talbott and wins over Cody Garbrandt, Ricky Simon and Montel Jackson, and he lands 4.65 significant strikes a minute to Rosas Jr.’s 1.34. Standing, this is Barcelos’s fight by a distance.
Two things cut the other way. He is 39, and he has been knocked down in three of his last six fights, including the first round against Jackson in April. And takedown defence against ordinary wrestlers is not the same thing as defence against a man who shoots six times every fifteen minutes and landed 8 of 9 attempts on Font in the third round alone. Barcelos has not faced that volume. Nobody at 135 has faced it often.
What the board is telling you
The market has moved against Rosas Jr. all week. The contract closed each day at: Sep 20 64¢, Sep 21 65¢, Sep 22 64¢, Sep 23 61¢, Sep 24 59¢, Sep 25 58¢, Sep 26 59¢. The sportsbooks moved the same way, from about -210 / +177 at the open to about -155 / +130 by Saturday. The money came in on the veteran, and most of the MMA press did too: CBS Sports, MMA Junkie, MMA Fighting and SI all picked Barcelos. The betting sites and SB Nation’s Jesse Holland picked Rosas Jr., almost all of them by decision.
At 59¢ the market gives Rosas Jr. a bit under three chances in five. That is the price of a coin flip with a lean, for a fighter whose path to winning is one skill the other man has to stop for 25 minutes. The trade is that the lean is too small.
How Kalshi prices the finish
| Method market | Bid | Ask |
|---|---|---|
| Rosas Jr. by decision | 27¢ | 28¢ |
| Rosas Jr. by submission | 19¢ | 20¢ |
| Rosas Jr. by KO or TKO | 11¢ | 12¢ |
| Barcelos by decision | 20¢ | 22¢ |
| Barcelos by KO or TKO | 14¢ | 15¢ |
| Barcelos by submission | 7¢ | 8¢ |
| Draw or no contest | 1¢ | 2¢ |
Read the method board as a check on the thesis. Rosas Jr. by decision is the single most expensive outcome at 28¢, and the fight going the distance trades at 50¢ to 51¢. The market expects a long, controlled fight if Rosas Jr. wins, which is the fight this column is describing. His submission line at 20¢ is worth noting too: six of his twelve wins are submissions.
What would make this wrong
The first way is simple: Barcelos stops the takedowns. If the first three or four shots come up empty, Rosas Jr. is a 1.34-strikes-a-minute fighter standing in front of a 4.65 one, and the price will fall fast. That is the version the MMA press is picking, and it is not unlikely.
The second is the distance. Rosas Jr. has never fought past fifteen minutes. His one loss came when he faded after winning the first round of a three-round fight. Barcelos has gone five rounds before, though not for about ten years. If Rosas Jr. wins three rounds on the mat and then fades, the fourth and fifth are where this ticket loses.
The most the position can lose is $99.54. The sell order at 71¢ exists so that a strong first round can be banked without having to be right about rounds four and five. If it never fills, the position is held and graded at settlement, win or lose, and it stays on the ledger at the same size either way.
Tale of the tape
| Raul Rosas Jr. | Raoni Barcelos | |
|---|---|---|
| Record | 12-1 | 22-5 |
| In the UFC | 6-1 | 11-4 |
| Age | 21 (turns 22 on Oct 8) | 39 |
| Height | 5 ft 9 in | 5 ft 7.5 in |
| Reach | 67 in | 67 in |
| Stance | Switch (UFCStats), southpaw (Wikipedia) | Orthodox (one source) |
| Camp | Sources differ: Rosas Brothers MMA (UFC.com), 10th Planet (Wikipedia); Marlon Vera corners him | Top Brother; Glover Teixeira in his corner |
| Fights out of | Las Vegas, born Clovis, New Mexico | Brazil |
| How the wins come | 2 KO or TKO, 6 submissions, 4 decisions | 8 KO or TKO, 3 submissions, 11 decisions |
| How the losses come | 1 decision (Christian Rodriguez, 2023) | 1 KO, 1 submission (2014), 3 decisions |
Career rates in the UFC
| Rate | Rosas Jr. | Barcelos |
|---|---|---|
| Significant strikes landed a minute | 1.34 | 4.65 |
| Significant strikes absorbed a minute | 1.24 | 4.24 |
| Striking accuracy | 42 per cent | 52 per cent |
| Takedowns landed per 15 minutes | 6.10 | 2.51 |
| Takedown defence | 25 per cent (3 of 4 attempts landed) | 87 to 88 per cent |
| Share of fight time in control | 56.9 per cent, a division record | Not published |
Two notes on the numbers. Rosas Jr.’s takedown defence is 25 per cent on a sample of four attempts in seven fights, so it says little. UFC.com’s athlete pages print a takedown accuracy of 3 per cent for both men, which is a display error; the figures here are from UFCStats and UFC.com’s own per-fight totals.
Recent form, last five
Raul Rosas Jr.
- WRob FontUnanimous decision, R3 5:00UFC 326, Mar 7, 202616 of 18 takedowns, 10:05 of control, all three cards 30-27
- WVince MoralesUnanimous decision, R3 5:00UFC Mexico City, Mar 29, 20254 takedowns, 9:38 of control
- WAoriqilengUnanimous decision, R3 5:00UFC 306, Sep 14, 20243 takedowns, 7:32 of control
- WRicky TurciosRear-naked choke, R2 2:22UFC Louisville, Jun 8, 2024Performance of the Night
- WTerrence MitchellTKO, punches, R1 0:54Noche UFC, Sep 16, 2023Performance of the Night
Raoni Barcelos
- WMontel JacksonSplit decision, R3 5:00UFC Vegas 116, Apr 25, 2026Knocked down in round 1, won 29-28 on two cards
- WRicky SimonUnanimous decision, R3 5:00UFC, Nov 8, 2025Taken down zero times
- WCody GarbrandtUnanimous decision, R3 5:00UFC, Jun 14, 2025Taken down zero times
- WPayton TalbottUnanimous decision, R3 5:00UFC 311, Jan 18, 2025Won as a long underdog; 8 takedowns landed
- WCristian QuinonezRear-naked choke, R3 2:04UFC, Feb 24, 2024
Quick answers
What price is Raul Rosas Jr. on Kalshi?
He was 59 cents to buy and 58 cents to sell when this page was written, Sep 26, 2026, about 2:00 PM PT, an implied chance of about 59 per cent. Barcelos was 42 cents to buy.
Why has the price moved toward Barcelos?
The Rosas Jr. contract opened at 64 cents on Sep 20 and closed at 58 to 59 cents every day from Sep 24. Sportsbooks moved from about -210 to about -155 over the same week, and most MMA media picks favoured Barcelos.
How good is Rosas Jr.'s wrestling?
He has 32 takedowns in seven UFC fights, tied for fifth in bantamweight history, and has spent 56.9 per cent of his UFC fight time in control, the highest share in the division's history per CBS Sports. He took Rob Font down 16 times in March.
Can Barcelos stop the takedowns?
He might. He is a five-time Brazilian national wrestling champion with 87 to 88 per cent takedown defence, and he was taken down four times in his last ten UFC fights.
What is the plan on this page and how is it graded?
A $100.00 stake on Rosas Jr. at 59 cents with a sell order at 71 cents. If the order fills the position closes for a net of $14.53 after both Kalshi fees. If it never trades there it is held to settlement. Either way it is graded after the fight and stays on the public ledger.
When is the fight?
Saturday, September 26, 2026, at the Meta Apex in Las Vegas. The main card starts at 5 PM PT and this is the main event, scheduled for five rounds.
Sources and method
- Contract prices, daily closes, volume and open interest. Kalshi public trade API: KXUFCFIGHT, KXUFCMOV, KXUFCDISTANCE and KXUFCROUNDS for this bout, read Sep 26 2026
- Rosas Jr. per-fight takedowns, control time and career rates. UFCStats fighter and fight pages, cross-checked against ESPN's per-fight stats feed
- Barcelos career rates and results. UFC.com athlete page and event results; per-fight takedowns from a UFCStats mirror (sports-statistics.com)
- Control-time record and the 32 takedowns. CBS Sports, Brian Campbell, Sep 24 2026
- Rosas Jr. on his weight cuts. MMA Junkie via Yahoo, Danny Segura, Dec 1 2023
- Official weigh-in. UFC.com and Cageside Press, Sep 25 2026: Rosas Jr. 136, Barcelos 135
- Sportsbook prices. MMAOddsBreaker opening line; DraftKings, FanDuel, BetMGM and UFC.com, Sep 23 to 26 2026
- Expert picks. CBS Sports, MMA Junkie, MMA Fighting, SI, Covers, SB Nation, Lindy's, MMASucka, Sep 25 to 26 2026
- Records and backgrounds. Wikipedia, Sherdog and UFC.com, cross-checked; where they disagree the page says so
Where sources disagree, the page says so: Rosas Jr.’s stance and camp, and the size of the age gap (17 years and 5 months by birth dates, reported as 18 by CBS Sports).
Contract prices move. The figures in the copy were read Sep 26, 2026, about 2:00 PM PT and are not updated; the quote inside the plan card is live. We are not affiliated with the UFC or with Kalshi, and nothing here is a recommendation to trade.