UFC Vegas 121: BetOnline Moneylines + Fight-by-Fight Analysis

UFC Fight Night: Rosas Jr. vs. Barcelos (UFC Vegas 121) — Saturday, September 26, 2026, UFC APEX, Las Vegas. Prelims 2:00 PM PT, main card 5:00 PM PT on Paramount+.

BetOnline American moneylines first, then fight-by-fight style and finish-method notes. Records from UFC.com and related databases. Favorites in red, underdogs in green.

BetOnline board (snapshot)

• Rosas Jr. −176 / Barcelos +149
• Vieira −152 / Bryczek +130
• Osmanli −279 / Akylbek Uulu +231
• Machado −220 / Amaya +185
• Nakamura −335 / Hiestand +273
• Bellato −175 / Edwards +149
• Harrell −131 / Brener +112
• Jackson −205 / Simon +173
• Perez −134 / Dumont +115
• Castaneda −330 / Alatengheili +269
• Gall −155 / Dumas +132
• Jauregui −980 / Demopoulos +663

Odds source: BetOnline.ag — checked September 22, 2026, ~12:11 PM PT. Lines move.

Main card

Raul Rosas Jr. (−176) vs Raoni Barcelos (+149) — Bantamweight, 5 rounds

Rosas Jr. (13-1): Young grappling-first freestyler. Wins break down roughly as 2 KO/TKO, 6 submissions, and about 5 decisions — he hunts takedowns and finishes on the mat more than he does with clean knockout power. Ranked around #12 at bantamweight, on a five-fight streak that includes Font, with a 67" reach.

Barcelos (22-5): Well-rounded BJJ/wrestling base with real finishing punch — about 8 KO/TKO, 3 submissions, 11 decisions. Ranked near #13, also on a five-fight streak, same 67" reach, strong takedown defense (~88%). At 39 he is the veteran plus-money side against a rising favorite.

Matchup read: Rosas wants extended grappling sequences; Barcelos wants to keep it honest standing and stuff the early entries. BetOnline makes Rosas solid chalk, not a runaway.

Rodolfo Vieira (−152) vs Robert Bryczek (+130) — Middleweight

Vieira (11-5): Elite BJJ. Career wins skew heavily to submissions (about 9 of 11), with 1 KO and 1 decision. He is dangerous once the fight hits the ground, but recent form includes a KO loss to Nickal and a decision loss to McConico.

Bryczek (18-7): Boxing-forward knockout artist — about 12 KO/TKO, 1 submission, 5 decisions. UFC record sits around 1-2 after beating Tavares. Longer frame (about 75" reach) and clear path if he keeps Vieira on the feet.

Matchup read: Classic grappler-vs-striker. Mild favorite for Vieira; Bryczek’s plus money is live if this stays upright.

Mehemmedeli Osmanli (−279) vs Ilimbek Akylbek Uulu (+231) — Bantamweight (TUF 34 men’s final)

Osmanli (~12-1 / 13-1 depending on TUF counting): Submission specialist — roughly 2 KO, 9 submissions, 2 decisions. Young (22) with a long 71" reach and a choke-heavy finishing profile.

Akylbek Uulu (~10-3 / 11-3): Wrestler-grappler with about 6 submission wins and 5 decisions, 0 KO wins listed. All three of his losses have come by KO/TKO — chin risk against power.

Matchup read: Osmanli is a heavy favorite. Akylbek’s path is wrestling control without eating clean shots.

Valesca Machado / Tina Black (−220) vs Melissa Amaya (+185) — Women’s strawweight (TUF 34 women’s final)

Machado (Tina Black) (~15-4, 1 NC on Sherdog; UFC listing may show early UFC mark differently): Kickboxing-leaning pressure striker — about 5 KO/TKO, 1 submission, 9 decisions. Losses mostly by decision. Invicta/A1 résumé, about 63.5" reach.

Amaya (9-0): Undefeated, well-rounded finisher — about 4 KO/TKO, 2 submissions, 3 decisions. Trains in the same Sik-Jitsu circle as Brady Hiestand.

Matchup read: Machado is clear favorite on BetOnline. Amaya’s undefeated finish rate makes her the plus-money “live dog.”

Brady Hiestand (+273) vs Rinya Nakamura (−335) — Bantamweight

Nakamura (10-1): Wrestler-striker who finishes early — about 6 KO/TKO, 1 submission, 3 decisions. Recent TKO of Fletcher in the first minute; only loss to Gafurov. Heavy favorite for a reason.

Hiestand (9-2): Wrestler-grappler — about 4 KO/TKO, 3 submissions, 2 decisions. Notable 71" reach for the weight; has been inactive since mid-2024.

Matchup read: Nakamura wants a fast, physical start. Hiestand needs to survive early and drag this into grappling exchanges. Deep plus money on Hiestand.

Prelims

Rodolfo Bellato (−175) vs Christian Edwards (+149) — Light heavyweight

Bellato (13-3-1, plus NC): Pressure power with BJJ — about 8 KO/TKO, 4 submissions, 1 decision. Big reach (~77.5"); recent R1 TKO of Fernandez.

Edwards (8-5): Tall athletic prospect (listed around 6'5") — about 4 KO/TKO, 2 submissions, 2 decisions. UFC debut loss to Bukauskas.

Matchup read: Bellato is the solid favorite if he closes distance and forces exchanges.

Elves Brener (+112) vs Josiah Harrell (−131) — Lightweight

Harrell (11-1): Grappling-heavy profile (UFC method widgets sometimes conflict with the win total — treat splits as approximate). Only loss was a R1 KO to Jacobe Smith. Slight favorite on BetOnline.

Brener (16-6): BJJ with kickboxing — about 3 KO, 11 submissions, 2 decisions. Coming in on a three-fight losing streak, including a decision to Ribovics.

Matchup read: Closest line on the card. Form favors caution on Brener; Harrell’s chin history is the main concern for the chalk.

Montel Jackson (−205) vs Ricky Simon (+173) — Bantamweight

Jackson (15-4): Fast athletic striker — about 8 KO/TKO, 1 submission, 6 decisions. Long reach (~75.5"). Dropped his last two (Figueiredo, Barcelos) but still the favorite here.

Simon (22-7-1): Wrestling pressure — about 7 KO/TKO, 4 submissions, 11 decisions. Recent draw with Yanez; rematch angle after beating Jackson in 2018.

Matchup read: Jackson wants space and speed; Simon wants clinch and control. Clear favorite for Jackson on BetOnline.

Norma Dumont (+115) vs Ailin Perez (−134) — Women’s bantamweight

Perez (13-2): Pressure wrestler — about 4 KO/TKO, 2 submissions, 7 decisions. Ranked #5, six-fight win streak (including Chiasson). Slight favorite.

Dumont (13-3): Point-fighting striker — 0 KO wins listed, 2 submissions, 11 decisions. Ranked #4; last loss to Jasmine Jasudavicius Edwards.

Matchup read: Near pick’em. Wrestling pace (Perez) vs volume striking and experience (Dumont).

John Castaneda (−330) vs Alatengheili (+269) — Bantamweight

Castaneda (21-8-1): Switch-stance striker with BJJ — about 8 KO/TKO, 6 submissions, 7 decisions. 71" reach; recent draw with Vologdin. Heavy favorite.

Alatengheili / Heili Alateng (17-10-2): Wrestling grind — about 5 KO/TKO, 3 submissions, 9 decisions. Shorter reach (~66.5"); lost to Blackshear in April 2025.

Matchup read: Castaneda should dictate range; Alateng needs top control and attrition.

Mickey Gall (−155) vs Sedriques Dumas (+132) — Middleweight

Gall (7-7): Rear-naked choke specialist — about 0 KO, 6 submissions, 1 decision. Four-fight losing streak and moving up in weight — still a mild favorite on this board.

Dumas (10-5, plus NC): Kickboxer with length (~79" reach) — about 4 KO/TKO, 2 submissions, 4 decisions. Lost his last two by submission, which is a problem against Gall.

Matchup read: If Gall gets the neck, Dumas’s recent sub losses matter. If Dumas keeps it standing at range, the reach advantage flips the script.

Vanessa Demopoulos (+663) vs Yazmin Jauregui (−980) — Women’s strawweight

Jauregui (11-2): Aggressive knockout striker — about 7 KO/TKO, 0 submissions, 4 decisions. Biggest favorite on the card. Loss by submission in R1 at UFC 306 (per UFC.com listing vs Souza).

Demopoulos (11-8): Scrappy BJJ threat (armbars) — about 1 KO, 4 submissions, 6 decisions. Short reach (~59.5"), three-fight losing streak, massive underdog.

Matchup read: Jauregui wants a fast knockout. Demopoulos’s only realistic path is a scramble into a submission before the striking gap decides it.

Fighter stats cross-checked against UFC.com and related databases; method splits can vary slightly by source (especially TUF counting).