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UFC 279: Diaz vs. Ferguson
Irene Aldana
Irene Aldana
13-6 · MEX
VS
Macy Chiasson
Macy Chiasson
8-2 · USA
September 10, 2022 · Las Vegas, Nevada, USA
Catch Weight · 140 lb · 3 rounds
137.5lb
Weigh-in
139.5lb
Irene Aldana def. Macy Chiasson by KO/TKO (Kick), R3 2:21
Performance
Round by round
SSTDKDCtrl
R1
Aldana25/470/000:55
Chiasson13/330/300:17
R2
Aldana9/120/000:05
Chiasson17/392/302:51
R3 · 2:21
Aldana3/120/010:00
Chiasson9/221/200:20
Total
Aldana37/710/011:00
Chiasson39/943/803:28

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
AldanaWin probabilityChiasson
33.5%66.5%
KO / TKO
31%
Submission
9%
Decision
60%
Expected fight time: 11.1 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 Aldana, blue toward Chiasson. Tap a bar for why.

Predicted outcomes
Aldana33%
Wins by
Model
Equity
Mkt
KO / TKO13%38%19%
Submission3%9%7%
Decision17%53%35%
Predicted output
Sig. strikes47 (2064)act 37
Takedowns0.5 (0.01.9)act 0
Chiasson67%
Wins by
Model
Equity
Mkt
KO / TKO19%28%12%
Submission6%9%5%
Decision42%63%22%
Predicted output
Sig. strikes54 (2374)act 39
Takedowns1.0 (0.03.4)act 3
Combined totals~102 sig strikes~1.4 takedownsmkt —
How it ends
mkt —
R122%
R213%
R35%
Distance60%
Fighter props
Most sig. strikestie 0.9%
Aldana
44.6%+122
Chiasson
-12254.4%
Most takedownstie 35.7%
Aldana
19.6%+228
Chiasson
-22844.7%
Significant strikes — over/under
Aldana
Expected: 47.1
47
Over 47
39.4%
+151
Exactly 47
1.0%
push
Under 47
59.6%
-151
059118
Chiasson
Expected: 54.4
54.5
Over 54.5
39.7%
+152
Under 54.5
60.3%
-152
069137
Takedowns — over/under
Aldana
Expected: 0.5
0.5
Over 0.5
31.0%
+222
Under 0.5
69.0%
-222
035
Chiasson
Expected: 1.0
1
Over 1
34.8%
+131
Exactly 1
19.8%
push
Under 1
45.5%
-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 11.1 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
Aldana33.5%61.9%−28.4-184
Chiasson66.5%38.1%+28.4+151
By method
Aldana by KO/TKO10.5%19.3%−8.8+336
Aldana by submission2.9%6.8%−3.9+1143
Aldana by decision20.0%35.2%−15.2+140
Chiasson by KO/TKO20.9%11.9%+9.0+607
Chiasson by submission5.8%4.9%+0.9+1623
Chiasson by decision39.8%21.9%+17.9+285
Total rounds (over)
Over 1.5 rds77.9%74.0%+3.9-373
Over 2.5 rds64.7%63.1%+1.6-207
Goes the distance
Fight goes to decision59.8%59.1%+0.7-171

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
61.7Striking65.3
Chiasson +3.6
48.6Grappling47.2
Aldana +1.4
Str/minStr accStr defAbsorbedTD/15TD accTD defSubs
Hover a point to see the values
AldanaChiasson
Tale of the tape
Ratings (Elo)
1554
Pound-for-pound
1563
1519
Divisional
1505
1520
Striking offense
1501
1493
Striking defense
1504
1489
Grappling offense
1515
1538
Grappling defense
1492
Physical
34 yrs
Age
31 yrs
5'9"
Height
5'11"
68"
Reach
72"
Orthodox
Stance
Orthodox
Striking (UFC career)
5.61
Strikes landed / min
3.70
39%
Strike accuracy
45%
5.94
Strikes absorbed / min
2.56
61%
Strike defense
46%
Grappling (UFC career)
0.22
Takedowns / 15 min
1.95
50%
Takedown accuracy
33%
84%
Takedown defense
64%
0.1
Sub attempts / 15 min
0.4
Form & résumé
60%
UFC win rate
75%
+1
Win/loss streak
+1
60%
Last-5 win rate
60%
50%
Finish rate
50%
Recent opp. quality
427
Days since last fight
126
Recent form (last 5 UFC)
Irene Aldana
  • WYana SantosKO/TKO R1
    missedClose +1001y 2mo before
  • LHolly HolmU-DEC R5
    Close +1031y 11mo before
  • WKetlen VieiraKO/TKO R1
    Close +2002y 9mo before
  • WVanessa MeloU-DEC R3
    opp missedClose -5253y before
  • LRaquel PenningtonS-DEC R3
    Close -1353y 2mo before
Macy Chiasson
  • WNorma DumontS-DEC R3
    opp missedClose +1844mo before
  • LRaquel PenningtonSUB R2
    missedClose +1219mo before
  • WMarion ReneauU-DEC R3
    Close -2361y 6mo before
  • WShanna YoungU-DEC R3
    Close -8002y 7mo before
  • LLina LansbergU-DEC R3
    Close -4302y 11mo before
Aldana — win / loss by method
Record: 13-6-0

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
7 wins, 2 losses
W
54% of wins
L
33% of losses
Submission
3 wins, 0 losses
W
23% of wins
L
0% of losses
Decision
3 wins, 4 losses
W
23% of wins
L
67% of losses
UFC
6win4loss0draw0NC
WinsLosses
2 (33%)KO/TKO(0%) 0
1 (17%)Submission(0%) 0
3 (50%)Decision(100%) 4
Non-UFC
7win2loss0draw0NC
WinsLosses
5 (71%)KO/TKO(100%) 2
2 (29%)Submission(0%) 0
0 (0%)Decision(0%) 0
Chiasson — win / loss by method
Record: 8-2-0

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, 0 losses
W
25% of wins
L
0% of losses
Submission
2 wins, 1 loss
W
25% of wins
L
50% of losses
Decision
4 wins, 1 loss
W
50% of wins
L
50% of losses
UFC
6win2loss0draw0NC
WinsLosses
2 (33%)KO/TKO(0%) 0
1 (17%)Submission(50%) 1
3 (50%)Decision(50%) 1
Non-UFC
2win0loss0draw0NC
WinsLosses
0 (0%)KO/TKO() 0
1 (50%)Submission() 0
1 (50%)Decision() 0

Profiles

Experience
Aldana
Chiasson
10
UFC fights
8
137.8 min · 13.8 avg
Octagon time
84.5 min · 10.6 avg
13y 9m
Career length
8y 9m
UFC schedule strength

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

Aldana
Chiasson
95W–37L · 72.0%
Overall
65W–31L · 67.7%
57W–17L · 77.0%
Wins
44W–19L · 69.8%
38W–20L · 65.5%
Losses
21W–12L · 63.6%
Non-UFC schedule strength
Aldana
Chiasson
45W–20L · 69.2%
Overall
1W–0L · 100.0%
22W–14L · 61.1%
Wins
1W–0L · 100.0%
23W–6L · 79.3%
Losses
0W–0L
Distance striking
Aldana
Chiasson
6.03
Landed / min
5.13
37.2%
Accuracy
32.4%
62.0%
Defense
53.2%
0.22
Knockdowns / 15 min
0.36
81.9%
Time at distance
31.4%
Grappling & control
Aldana
Chiasson
0.22
Takedowns / 15 min
1.95
50.0%
Takedown accuracy
33.3%
84.4%
Takedown defense
64.3%
0.11
Sub attempts / 15 min
0.36
15.1%
Control share
69.5%
Strike target map
Aldana
  • Head68%(525)div 65%
  • Body14%(105)div 19%
  • Legs18%(143)div 15%
Chiasson
  • Head56%(175)div 65%
  • Body37%(117)div 19%
  • Legs7%(21)div 15%

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

Irene Aldana
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.