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UFC 320: Ankalaev vs. Pereira 2
Yana Santos
Yana Santos
16-8 · RUS
VS
Macy Chiasson
Macy Chiasson
10-4 · USA
October 4, 2025 · Las Vegas, Nevada, USA
Bantamweight · 137 lb · 3 rounds
135.0lb
Weigh-in
137.5lb
Yana Santos def. Macy Chiasson by U-DEC, R3 5:00
Performance
Round by round
SSTDKDCtrl
R1
Santos31/500/000:49
Chiasson14/330/100:00
R2
Santos31/520/000:00
Chiasson25/501/101:03
R3
Santos3/220/100:00
Chiasson15/351/102:40
Total
Santos65/1240/100:49
Chiasson54/1182/303:43

Scorecards

Santos vs Chiasson

RdBen CartlidgeJunichiro KamijoSal D'AmatoCommunity
R110-910-910-910-9
R210-910-910-99.9-9.1
R39-109-109-108.9-10
Total29-2829-2829-2828.8-28.1

Media (11 cards) · avg 2928 · 11 Santos · 0 Chiasson

Official cards + public consensus via MMA Decisions. Per round: Santos-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
SantosWin probabilityChiasson
31.0%69.0%
KO / TKO
28%
Submission
19%
Decision
53%
Expected fight time: 10.7 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 Santos, blue toward Chiasson. Tap a bar for why.

Predicted outcomes
Santos31%
Wins by
Model
Equity
Mkt
KO / TKO8%27%7%
Submission3%10%3%
Decision20%63%26%
Predicted output
Sig. strikes40 (1654)act 65
Takedowns0.6 (0.02.4)act 0
Chiasson69%
Wins by
Model
Equity
Mkt
KO / TKO19%28%12%
Submission16%23%16%
Decision34%49%35%
Predicted output
Sig. strikes41 (1755)act 54
Takedowns1.0 (0.03.5)act 2
Combined totals~81 sig strikes~1.6 takedownsmkt —
How it ends
mkt —
R122%
R219%
R36%
Distance53%
Fighter props
Most sig. strikestie 1.2%
Santos
48.5%+104
Chiasson
-10450.3%
Most takedownstie 33.5%
Santos
24.6%+171
Chiasson
-17141.9%
Significant strikes — over/under
Santos
Expected: 40.1
40
Over 40
39.2%
+152
Exactly 40
1.2%
push
Under 40
59.6%
-152
051101
Chiasson
Expected: 40.9
41
Over 41
39.1%
+153
Exactly 41
1.2%
push
Under 41
59.8%
-153
052103
Takedowns — over/under
Santos
Expected: 0.6
0.5
Over 0.5
38.4%
+161
Under 0.5
61.7%
-161
035
Chiasson
Expected: 1.0
1
Over 1
35.1%
+131
Exactly 1
18.7%
push
Under 1
46.1%
-131
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 10.7 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
Santos31.0%35.9%−4.9+166
Chiasson69.0%64.1%+4.9-206
By method
Santos by KO/TKO8.6%7.1%+1.5+1094
Santos by submission5.8%3.2%+2.6+2553
Santos by decision16.6%26.0%−9.4+226
Chiasson by KO/TKO19.3%12.4%+6.9+583
Chiasson by submission12.9%16.1%−3.2+429
Chiasson by decision36.9%35.1%+1.8+142
Total rounds (over)
Over 1.5 rds78.4%77.2%+1.2-482
Over 2.5 rds59.1%67.4%−8.3-259
Goes the distance
Fight goes to decision53.4%63.6%−10.2-211

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
73.8Striking64.0
Santos +9.8
43.3Grappling50.9
Chiasson +7.6
Str/minStr accStr defAbsorbedTD/15TD accTD defSubs
Hover a point to see the values
SantosChiasson
Tale of the tape
Ratings (Elo)
1543
Pound-for-pound
1561
1566
Divisional
1581
1508
Striking offense
1506
1497
Striking defense
1500
1491
Grappling offense
1519
1511
Grappling defense
1492
Physical
35 yrs
Age
34 yrs
5'6"
Height
5'11"
68"
Reach
72"
Orthodox
Stance
Orthodox
Striking (UFC career)
4.42
Strikes landed / min
3.49
59%
Strike accuracy
46%
3.07
Strikes absorbed / min
2.68
53%
Strike defense
45%
Grappling (UFC career)
0.87
Takedowns / 15 min
2.08
50%
Takedown accuracy
35%
54%
Takedown defense
71%
0.1
Sub attempts / 15 min
0.4
Form & résumé
55%
UFC win rate
67%
+2
Win/loss streak
-1
40%
Last-5 win rate
60%
0%
Finish rate
63%
Recent opp. quality
154
Days since last fight
126
Recent form (last 5 UFC)
Yana Santos
  • WMiesha TateU-DEC R3
    Close +1275mo before
  • WChelsea ChandlerU-DEC R3
    opp missedClose -1531y 2mo before
  • LKarol RosaS-DEC R3
    Close +1502y 3mo before
  • LHolly HolmU-DEC R3
    Close +1952y 6mo before
  • LIrene AldanaKO/TKO R1
    opp missedClose -1204y 3mo before
Macy Chiasson
  • LKetlen VieiraU-DEC R3
    opp missedClose -1464mo before
  • WMayra Bueno SilvaKO/TKO R2
    Close -1141y 3mo before
  • WPannie KianzadSUB R1
    Close -2301y 7mo before
  • LIrene AldanaKO/TKO R3
    Close +1513y 1mo before
  • WNorma DumontS-DEC R3
    opp missedClose +1843y 5mo before
Santos — win / loss by method
Record: 16-8-0, 1 NC

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
7 wins, 3 losses
W
44% of wins
L
38% of losses
Submission
1 win, 2 losses
W
6% of wins
L
25% of losses
Decision
8 wins, 3 losses
W
50% of wins
L
38% of losses
UFC
6win5loss0draw0NC
WinsLosses
0 (0%)KO/TKO(60%) 3
0 (0%)Submission(0%) 0
6 (100%)Decision(40%) 2
Non-UFC
10win3loss0draw1NC
WinsLosses
7 (70%)KO/TKO(0%) 0
1 (10%)Submission(67%) 2
2 (20%)Decision(33%) 1
Chiasson — win / loss by method
Record: 10-4-0

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
3 wins, 1 loss
W
30% of wins
L
25% of losses
Submission
3 wins, 1 loss
W
30% of wins
L
25% of losses
Decision
4 wins, 2 losses
W
40% of wins
L
50% of losses
UFC
8win4loss0draw0NC
WinsLosses
3 (38%)KO/TKO(25%) 1
2 (25%)Submission(25%) 1
3 (38%)Decision(50%) 2
Non-UFC
2win0loss0draw0NC
WinsLosses
0 (0%)KO/TKO() 0
1 (50%)Submission() 0
1 (50%)Decision() 0

Profiles

Experience
Santos
Chiasson
11
UFC fights
12
138.6 min · 12.6 avg
Octagon time
122.7 min · 10.2 avg
17y 2m
Career length
8y 9m
UFC schedule strength

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

Santos
Chiasson
132W–41L · 76.3%
Overall
118W–51L · 69.8%
63W–22L · 74.1%
Wins
70W–29L · 70.7%
69W–19L · 78.4%
Losses
48W–22L · 68.6%
Non-UFC schedule strength
Santos
Chiasson
43W–18L · 70.5%
Overall
1W–0L · 100.0%
21W–8L · 72.4%
Wins
1W–0L · 100.0%
22W–10L · 68.8%
Losses
0W–0L
Distance striking
Santos
Chiasson
7.22
Landed / min
5.17
48.0%
Accuracy
35.6%
62.0%
Defense
54.5%
0.11
Knockdowns / 15 min
0.24
35.2%
Time at distance
33.4%
Grappling & control
Santos
Chiasson
0.87
Takedowns / 15 min
2.08
50.0%
Takedown accuracy
35.4%
53.6%
Takedown defense
71.4%
0.11
Sub attempts / 15 min
0.37
56.8%
Control share
60.4%
Strike target map
Santos
  • Head32%(198)div 62%
  • Body41%(248)div 21%
  • Legs27%(166)div 16%
Chiasson
  • Head56%(239)div 62%
  • Body34%(144)div 21%
  • Legs11%(45)div 16%

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

Yana Santos
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.