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Ketlen Vieira vs Macy Chiasson

Women's Bantamweight · Prelims · UFC Fight Night: Blanchfield vs. Barber

FINAL: Ketlen Vieira by U-DEC
Ketlen Vieira
Ketlen Vieira
Age 33 · Elo 1559
LWLWW
413 days since last fight
vs
Macy Chiasson
Macy Chiasson
Age 33 · Elo 1549
WWLWL
441 days since last fight

Who wins, by source

Ketlen VieiraMacy Chiasson
Claude Claude: Ketlen Vieira 35% Claude: Macy Chiasson 65% 35% 65% GPT GPT: Ketlen Vieira 35% GPT: Macy Chiasson 65% 35% 65% Elo Elo: Ketlen Vieira 51% Elo: Macy Chiasson 49% 51% 49%

Each row splits one source's view of the fight. The dashed line is even odds. Where the models sit further from the market, they are claiming an edge.

Tale of the tape

Ketlen VieiraMacy Chiasson
Strikes landed / min Ketlen Vieira Strikes landed / min: 2.92 2.92 Macy Chiasson Strikes landed / min: 3.77 3.77 Strikes absorbed / min Ketlen Vieira Strikes absorbed / min: 3.90 3.90 Macy Chiasson Strikes absorbed / min: 2.79 2.79 Striking accuracy Ketlen Vieira Striking accuracy: 41% 41% Macy Chiasson Striking accuracy: 46% 46% Striking defense Ketlen Vieira Striking defense: 51% 51% Macy Chiasson Striking defense: 44% 44% Takedowns / 15 min Ketlen Vieira Takedowns / 15 min: 1.39 1.39 Macy Chiasson Takedowns / 15 min: 2.37 2.37 Takedown defense Ketlen Vieira Takedown defense: 88% 88% Macy Chiasson Takedown defense: 70% 70% Sub attempts / 15 min Ketlen Vieira Sub attempts / 15 min: 0.6 0.6 Macy Chiasson Sub attempts / 15 min: 0.4 0.4

Career UFC averages. Bars are scaled within each row, so compare left against right, not row against row. The stronger side is highlighted, and for strikes absorbed the lower number is the better one.

How it ends

KO/TKOSubmissionDecision
Claude Claude: KO/TKO 25% 25% Claude: Submission 15% 15% Claude: Decision 60% 60%GPT GPT: KO/TKO 20% 20% GPT: Submission 10% 10% GPT: Decision 70% 70%

Each model's split across the ways this fight can finish, out of 100.

The analysis

Claude
Macy Chiasson by Decision, 65% confidence

Chiasson enters this matchup with significant momentum, having won her last three fights including two finishes, while Vieira has struggled with consistency, dropping two of her last three. The statistical edge clearly favors Chiasson, who generates higher striking volume (3.77 vs 2.92 SLPM) with better accuracy (46% vs 41%) and maintains a positive strike differential (+0.98) compared to Vieira's negative differential (-0.98). Chiasson's superior takedown average (2.37 vs 1.39) will be crucial against Vieira's strong takedown defense (88%), but Chiasson's height and reach advantages (5'11"/72" vs 5'8"/68") will allow her to control distance and land at range. Their common opponent analysis shows equal performance, but Chiasson's recent form is significantly stronger with three consecutive wins including two finishes, compared to Vieira's inconsistency.

GPT
Macy Chiasson by Decision, 65% confidence

Macy Chiasson has a higher significant strikes landed per minute (SLPM) and takedown average (TDAvg) compared to Ketlen Vieira. Although Vieira has a better takedown defense, Chiasson's higher volume of strikes and takedowns could win her the fight by decision.