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UFC Fight Night: Blanchfield vs. Barber
Ketlen Vieira
Ketlen Vieira
14-4 · BRA
VS
Macy Chiasson
Macy Chiasson
10-3 · USA
May 31, 2025 · Las Vegas, Nevada, USA
Featherweight · 144 lb · 3 rounds
146.0lbMissed +1.0
Weigh-in
144.0lb
Ketlen Vieira def. Macy Chiasson by U-DEC, R3 5:00
Performance
Round by round
SSTDKDCtrl
R1
Vieira18/480/001:06
Chiasson17/310/000:08
R2
Vieira2/40/104:47
Chiasson0/10/200:07
R3
Vieira8/120/004:13
Chiasson5/110/200:18
Total
Vieira28/640/1010:06
Chiasson22/430/400:33

Scorecards

Vieira vs Chiasson

RdChris LebenMichael BellSal D'AmatoCommunity
R19-1010-910-99.6-9.4
R210-910-910-910-9
R310-99-1010-99.4-9.6
Total29-2829-2830-2729-28

Media (11 cards) · avg 3027 · 11 Vieira · 0 Chiasson

Official cards + public consensus via MMA Decisions. Per round: Vieira-Chiasson.

Pre-fight

The model's read going in

The walk-forward model's call at the time of the bout — persisted out-of-sample, with no hindsight about the result.

Prediction
VieiraWin probabilityChiasson
36.0%64.0%
KO / TKO
30%
Submission
21%
Decision
49%
Expected fight time: 10.2 min
Retrospective pick: the walk-forward model's call at the time of the fight — persisted out-of-sample, with no hindsight about the result.
What drives the pick

Each bar is a feature's push on the model from the center axis. Red pushes toward Vieira, blue toward Chiasson. Tap a bar for why.

Predicted outcomes
Vieira36%
Wins by
Model
Equity
Mkt
KO / TKO7%20%7%
Submission7%20%10%
Decision22%60%29%
Predicted output
Sig. strikes31 (1342)act 28
Takedowns0.9 (0.03.2)act 0
Chiasson64%
Wins by
Model
Equity
Mkt
KO / TKO23%36%10%
Submission14%21%8%
Decision27%43%37%
Predicted output
Sig. strikes39 (1652)act 22
Takedowns0.7 (0.02.6)act 0
Combined totals~70 sig strikes~1.6 takedownsmkt —
How it ends
mkt —
R128%
R216%
R37%
Distance49%
Fighter props
Most sig. strikestie 1.3%
Vieira
42.2%+134
Chiasson
-13456.4%
Most takedownstie 31.9%
Vieira
39.1%-135
Chiasson
+13528.9%
Significant strikes — over/under
Vieira
Expected: 31.2
31
Over 31
39.3%
+151
Exactly 31
1.5%
push
Under 31
59.2%
-151
04079
Chiasson
Expected: 38.6
38.5
Over 38.5
39.9%
+150
Under 38.5
60.1%
-150
04997
Takedowns — over/under
Vieira
Expected: 0.9
1
Over 1
33.3%
+139
Exactly 1
20.3%
push
Under 1
46.4%
-139
035
Chiasson
Expected: 0.7
0.5
Over 0.5
44.5%
+124
Under 0.5
55.5%
-124
035

Odds are model-implied (no real prop market is priced for these). The “most” prices are draw-no-bet — a tie (for takedowns, usually 0–0) is a push, so each side is priced off its chance of winning given a result, while the % shown is the raw chance of landing strictly more. Drag a line in half-point steps: a half line (e.g. 2.5) is a clean over/under, while a whole number adds a third outcome — landing exactly on it, a push — so over, exact and under sum to 100%. On a whole number the over/under odds are draw-no-bet (priced off the decisive mass, since the push refunds), so the two sides stay mirror images rather than implying an arbitrage.

Expected fight time 10.2 min. Predicted-output ranges are percentiles of the model’s simulated fights: sig strikes the middle 50% (25th–75th); takedowns the wider 10th–90th, since they’re 0 in most fights so a narrow band would collapse to 0. Win-by-method = win probability × that fighter’s own method split: the model forecasts how the fight ends, and that forecast is divided between the corners by each fighter’s finishing record — UFC wins in full, earlier-career wins at half weight, as of fight night — reconciled so the fighters’ totals still equal their win probabilities and the methods still total the fight-level forecast above. “Equity” is each of those over that fighter’s win % — how they win given that they win — so a column adds to 100%, and it differs by corner. A fighter with no classifiable wins at any level leans on the fight-level split. “How it ends” is the model’s round-of-finish split. “Mkt” is the de-vigged market prop (consensus across books), shown for context, not as a betting signal; rounds & totals slots fill as that data lands. Percentages are apportioned by largest remainder, so each set adds to its total exactly and an individual figure can sit a point off its own rounding.

Model vs market
Final
ModelMarketGapLine
To win
Vieira36.0%43.1%−7.1+122
Chiasson64.0%56.9%+7.1-146
By method
Vieira by KO/TKO10.8%6.8%+4.0+1144
Vieira by submission7.4%9.6%−2.2+778
Vieira by decision17.7%28.7%−11.0+192
Chiasson by KO/TKO19.3%10.4%+8.9+709
Chiasson by submission13.2%8.0%+5.2+946
Chiasson by decision31.6%36.6%−5.0+130
Total rounds (over)
Over 1.5 rds72.1%81.5%−9.4-681
Over 2.5 rds56.4%69.6%−13.2-289
Goes the distance
Fight goes to decision49.3%66.8%−17.5-246

Market % is the de-vigged (no-vig) consensus across the books that price both fighters; the line is the average across books with the min–max range in parentheses. Gap is the model minus the market in points (+ = the model rates that outcome above the market). Thin or one-sided markets are flagged or left blank rather than shown as a fabricated %. Shown for context, not as a bet — the closing line is the sharpest public price and the model trails it on average. For 5-round bouts the model splits its round-3+ finish mass into rounds 3–5 by the historical within-bucket rate, so the over-3.5 / 4.5 lines carry a model estimate.

Trait web
56.9Striking64.0
Chiasson +7.2
59.1Grappling54.1
Vieira +5.0
Str/minStr accStr defAbsorbedTD/15TD accTD defSubs
Hover a point to see the values
VieiraChiasson
Tale of the tape
Ratings (Elo)
1574
Pound-for-pound
1577
1520
Divisional
1522
1477
Striking offense
1507
1502
Striking defense
1499
1507
Grappling offense
1528
1529
Grappling defense
1493
Physical
33 yrs
Age
33 yrs
5'8"
Height
5'11"
68"
Reach
72"
Orthodox
Stance
Orthodox
Striking (UFC career)
2.92
Strikes landed / min
3.77
41%
Strike accuracy
46%
3.90
Strikes absorbed / min
2.79
51%
Strike defense
44%
Grappling (UFC career)
1.38
Takedowns / 15 min
2.37
45%
Takedown accuracy
39%
89%
Takedown defense
70%
0.6
Sub attempts / 15 min
0.4
Form & résumé
67%
UFC win rate
73%
-1
Win/loss streak
+2
60%
Last-5 win rate
60%
13%
Finish rate
63%
Recent opp. quality
238
Days since last fight
336
Recent form (last 5 UFC)
Ketlen Vieira
  • LKayla HarrisonU-DEC R3
    Close +7008mo before
  • WPannie KianzadU-DEC R3
    Close -1561y 10mo before
  • LRaquel PenningtonS-DEC R3
    Close -1362y 5mo before
  • WHolly HolmS-DEC R5
    Close +1943y before
  • WMiesha TateU-DEC R5
    Close -1103y 6mo before
Macy Chiasson
  • WMayra Bueno SilvaKO/TKO R2
    Close -11411mo before
  • WPannie KianzadSUB R1
    Close -2301y 2mo before
  • LIrene AldanaKO/TKO R3
    Close +1512y 9mo before
  • WNorma DumontS-DEC R3
    opp missedClose +1843y 1mo before
  • LRaquel PenningtonSUB R2
    missedClose +1213y 5mo before
Vieira — win / loss by method
Record: 14-4-0

Bar length is fight count (largest bar = full width); shading splits finishes by round and decisions by unanimous vs split — tap a bar for the round-by-round count.

KO/TKO
2 wins, 1 loss
W
14% of wins
L
25% of losses
Submission
4 wins, 0 losses
W
29% of wins
L
0% of losses
Decision
8 wins, 3 losses
W
57% of wins
L
75% of losses
UFC
8win4loss0draw0NC
WinsLosses
0 (0%)KO/TKO(25%) 1
1 (13%)Submission(0%) 0
7 (88%)Decision(75%) 3
Non-UFC
6win0loss0draw0NC
WinsLosses
2 (33%)KO/TKO() 0
3 (50%)Submission() 0
1 (17%)Decision() 0
Chiasson — win / loss by method
Record: 10-3-0

Bar length is fight count (largest bar = full width); shading splits finishes by round and decisions by unanimous vs split — tap a bar for the round-by-round count.

KO/TKO
3 wins, 1 loss
W
30% of wins
L
33% of losses
Submission
3 wins, 1 loss
W
30% of wins
L
33% of losses
Decision
4 wins, 1 loss
W
40% of wins
L
33% of losses
UFC
8win3loss0draw0NC
WinsLosses
3 (38%)KO/TKO(33%) 1
2 (25%)Submission(33%) 1
3 (38%)Decision(33%) 1
Non-UFC
2win0loss0draw0NC
WinsLosses
0 (0%)KO/TKO() 0
1 (50%)Submission() 0
1 (50%)Decision() 0

Profiles

Experience
Vieira
Chiasson
12
UFC fights
11
184.1 min · 15.3 avg
Octagon time
107.7 min · 9.8 avg
11y 10m
Career length
8y 9m
UFC schedule strength

Opponents' records on fight night — toggle their full cross-promotional record vs UFC bouts only.

Vieira
Chiasson
138W–48L · 74.2%
Overall
104W–47L · 68.9%
83W–29L · 74.1%
Wins
70W–29L · 70.7%
55W–19L · 74.3%
Losses
34W–18L · 65.4%
Non-UFC schedule strength
Vieira
Chiasson
2W–1L · 66.7%
Overall
1W–0L · 100.0%
2W–1L · 66.7%
Wins
1W–0L · 100.0%
0W–0L
Losses
0W–0L
Distance striking
Vieira
Chiasson
4.88
Landed / min
5.17
35.7%
Accuracy
34.5%
58.0%
Defense
52.9%
0.00
Knockdowns / 15 min
0.28
46.1%
Time at distance
34.5%
Grappling & control
Vieira
Chiasson
1.38
Takedowns / 15 min
2.37
44.7%
Takedown accuracy
38.6%
88.9%
Takedown defense
70.0%
0.57
Sub attempts / 15 min
0.42
58.8%
Control share
69.7%
Strike target map
Vieira
  • Head77%(412)div 56%
  • Body14%(78)div 26%
  • Legs9%(48)div 18%
Chiasson
  • Head57%(231)div 56%
  • Body34%(138)div 26%
  • Legs9%(37)div 18%

Where each fighter lands significant strikes (career). “div” = the weight-class average.

Ketlen Vieira
CloseSSTDKDCtrl

Per-fight: SS & TD shown landed/attempted; Close = consensus closing line.

Macy Chiasson
CloseSSTDKDCtrl

Per-fight: SS & TD shown landed/attempted; Close = consensus closing line.