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UFC 83: Serra vs St-Pierre 2
Jason Day
Jason Day
17-7 · CAN
VS
Alan Belcher
Alan Belcher
12-4 · USA
April 19, 2008 · Montreal, Quebec, Canada
Middleweight · 3 rounds
183.5lb
Weigh-in
185.0lb
Jason Day def. Alan Belcher by KO/TKO (Punches), R1 3:58
Performance
Round by round
SSTDKDCtrl
R1 · 3:58
Day29/430/000:00
Belcher3/81/102:43
Total
Day29/430/000:00
Belcher3/81/102:43

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
DayWin probabilityBelcher
29.8%70.2%
KO / TKO
40%
Submission
13%
Decision
47%
Expected fight time: 10.1 min
What drives the pick

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

Predicted outcomes
Day30%
Wins by
Model
Equity
Mkt
KO / TKO10%34%
Submission5%17%
Decision15%49%
Predicted output
Sig. strikes37 (2148)act 29
Takedowns0.3 (0.01.1)act 0
Belcher70%
Wins by
Model
Equity
Mkt
KO / TKO30%43%
Submission8%11%
Decision32%46%
Predicted output
Sig. strikes41 (2353)act 3
Takedowns1.1 (0.03.3)act 1
Combined totals~78 sig strikes~1.3 takedownsmkt —
How it ends
mkt —
R122%
R227%
R34%
Distance47%
Fighter props
Most sig. strikestie 1.4%
Day
44.4%+122
Belcher
-12254.2%
Most takedownstie 41.7%
Day
12.3%+373
Belcher
-37346.0%
Significant strikes — over/under
Day
Expected: 37.0
37
Over 37
41.5%
+136
Exactly 37
1.8%
push
Under 37
56.7%
-136
04793
Belcher
Expected: 41.1
41
Over 41
41.8%
+135
Exactly 41
1.6%
push
Under 41
56.5%
-135
052103
Takedowns — over/under
Day
Expected: 0.3
0.5
Over 0.5
19.9%
+402
Under 0.5
80.1%
-402
035
Belcher
Expected: 1.1
1
Over 1
35.0%
+139
Exactly 1
16.3%
push
Under 1
48.7%
-139
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 10.1 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
Day29.8%24.2%+5.6+301
Belcher70.2%75.8%−5.6-356

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
Str/minStr accStr defAbsorbedTD/15TD accTD defSubs
Hover a point to see the values
DayBelcher
Tale of the tape
Ratings (Elo)
1516
Pound-for-pound
1537
1516
Divisional
1522
1500
Striking offense
1501
1500
Striking defense
1508
1500
Grappling offense
1515
1500
Grappling defense
1511
Physical
26 yrs
Age
23 yrs
6'0"
Height
6'2"
72"
Reach
75"
Orthodox
Stance
Orthodox
Striking (UFC career)
Strikes landed / min
2.27
Strike accuracy
41%
Strikes absorbed / min
2.40
Strike defense
60%
Grappling (UFC career)
Takedowns / 15 min
0.67
Takedown accuracy
20%
Takedown defense
59%
Sub attempts / 15 min
1.0
Form & résumé
UFC win rate
60%
Win/loss streak
+2
Last-5 win rate
60%
Finish rate
100%
Recent opp. quality
Days since last fight
182
Recent form (last 5 UFC)
Jason Day
No prior UFC fights.
Alan Belcher
  • WKalib StarnesKO/TKO R2
    Close -1036mo before
  • WSean SalmonSUB R1
    11mo before
  • LKendall GroveSUB R2
    Close +1451y before
  • WJorge SantiagoKO/TKO R3
    Close +1101y 4mo before
  • LYushin OkamiU-DEC R3
    Close +1551y 8mo before
Day — win / loss by method
Record: 17-7-0

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, 3 losses
W
41% of wins
L
43% of losses
Submission
8 wins, 4 losses
W
47% of wins
L
57% of losses
Decision
2 wins, 0 losses
W
12% of wins
L
0% of losses
UFC
0win0loss0draw0NC
WinsLosses
0 ()KO/TKO() 0
0 ()Submission() 0
0 ()Decision() 0
Non-UFC
17win7loss0draw0NC
WinsLosses
7 (41%)KO/TKO(43%) 3
8 (47%)Submission(57%) 4
2 (12%)Decision(0%) 0
Belcher — win / loss by method
Record: 12-4-0

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
8 wins, 1 loss
W
67% of wins
L
25% of losses
Submission
3 wins, 1 loss
W
25% of wins
L
25% of losses
Decision
1 win, 2 losses
W
8% of wins
L
50% of losses
UFC
3win2loss0draw0NC
WinsLosses
2 (67%)KO/TKO(0%) 0
1 (33%)Submission(50%) 1
0 (0%)Decision(50%) 1
Non-UFC
9win2loss0draw0NC
WinsLosses
6 (67%)KO/TKO(50%) 1
2 (22%)Submission(0%) 0
1 (11%)Decision(50%) 1

Profiles

Experience
Day
Belcher
0
UFC fights
5
Octagon time
45.0 min · 9.0 avg
Career length
22y 0m
UFC schedule strength

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

Day
Belcher
Overall
52W–15L · 77.6%
Wins
29W–9L · 76.3%
Losses
23W–6L · 79.3%
Non-UFC schedule strength
Day
Belcher
147W–72L · 67.1%
Overall
50W–53L · 48.5%
105W–60L · 63.6%
Wins
35W–42L · 45.5%
42W–12L · 77.8%
Losses
15W–11L · 57.7%
Distance striking
Day
Belcher
Landed / min
3.30
Accuracy
33.9%
Defense
69.3%
Knockdowns / 15 min
0.33
Time at distance
41.8%
Grappling & control
Day
Belcher
Takedowns / 15 min
0.67
Takedown accuracy
20.0%
Takedown defense
58.8%
Sub attempts / 15 min
1.00
Control share
39.0%
Strike target map
Day
  • Head0%(0)div 63%
  • Body0%(0)div 20%
  • Legs0%(0)div 18%
  • No strike data on record.
Belcher
  • Head52%(53)div 63%
  • Body14%(14)div 20%
  • Legs34%(35)div 18%

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

Jason Day

No UFC fights on record.

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

Alan Belcher
CloseSSTDKDCtrl

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