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UFC 239: Jones vs. Santos
Song Yadong
Song Yadong
14-5 · CHN
VS
Alejandro Perez
Alejandro Perez
24-7-1 · MEX
July 6, 2019 · Las Vegas, Nevada, USA
Bantamweight · 3 rounds
135.5lb
Weigh-in
135.5lb
Song Yadong def. Alejandro Perez by KO/TKO (Punch), R1 2:04
Performance
Round by round
SSTDKDCtrl
R1 · 2:04
Yadong8/200/010:01
Perez1/140/000:00
Total
Yadong8/200/010:01
Perez1/140/000:00

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
YadongWin probabilityPerez
89.7%10.3%
KO / TKO
27%
Submission
7%
Decision
67%
Expected fight time: 12.6 min
What drives the pick

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

Predicted outcomes
Yadong90%
Wins by
Model
Equity
Mkt
KO / TKO23%26%
Submission6%7%
Decision61%67%
Predicted output
Sig. strikes69 (3990)act 8
Takedowns0.7 (0.02.3)act 0
Perez10%
Wins by
Model
Equity
Mkt
KO / TKO3%31%
Submission1%7%
Decision6%62%
Predicted output
Sig. strikes45 (2559)act 1
Takedowns0.2 (0.00.9)act 0
Combined totals~114 sig strikes~0.9 takedownsmkt —
How it ends
mkt —
R110%
R212%
R311%
Distance67%
Fighter props
Most sig. strikestie 0.9%
Yadong
68.5%-223
Perez
+22330.7%
Most takedownstie 44.5%
Yadong
41.4%-296
Perez
+29614.0%
Significant strikes — over/under
Yadong
Expected: 69.1
69
Over 69
42.1%
+135
Exactly 69
1.0%
push
Under 69
56.9%
-135
087173
Perez
Expected: 45.3
45.5
Over 45.5
42.2%
+137
Under 45.5
57.8%
-137
057114
Takedowns — over/under
Yadong
Expected: 0.7
0.5
Over 0.5
47.7%
+110
Under 0.5
52.3%
-110
035
Perez
Expected: 0.2
0
Over 0
22.1%
Exactly 0
77.9%
push
Under 0
0.0%
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 12.6 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
Yadong89.7%66.4%+23.3-225
Perez10.3%33.6%−23.3+185

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
71.9Striking66.3
Yadong +5.6
70.5Grappling33.8
Yadong +36.7
Str/minStr accStr defAbsorbedTD/15TD accTD defSubs
Hover a point to see the values
YadongPerez
Tale of the tape
Ratings (Elo)
1553
Pound-for-pound
1590
1540
Divisional
1591
1506
Striking offense
1505
1529
Striking defense
1522
Grappling offense
Grappling defense
Physical
21 yrs
Age
29 yrs
5'8"
Height
5'6"
67"
Reach
67"
Orthodox
Stance
Orthodox
Striking (UFC career)
4.31
Strikes landed / min
3.58
42%
Strike accuracy
36%
2.91
Strikes absorbed / min
2.92
68%
Strike defense
65%
Grappling (UFC career)
1.54
Takedowns / 15 min
0.53
100%
Takedown accuracy
20%
100%
Takedown defense
73%
1.0
Sub attempts / 15 min
0.1
Form & résumé
100%
UFC win rate
78%
+3
Win/loss streak
-1
100%
Last-5 win rate
80%
67%
Finish rate
43%
Recent opp. quality
224
Days since last fight
126
Recent form (last 5 UFC)
Song Yadong
  • WVince MoralesU-DEC R3
    Close -5507mo before
  • WFelipe ArantesKO/TKO R2
    Close -1151y before
  • WBharat KandareSUB R1
    Close -1601y 7mo before
Alejandro Perez
  • LCody StamannU-DEC R3
    Close +1504mo before
  • WEddie WinelandU-DEC R3
    Close -1751y before
  • WMatthew LopezKO/TKO R2
    Close -1101y 3mo before
  • WIuri AlcantaraU-DEC R3
    Close +1551y 7mo before
  • WAndre SoukhamthathS-DEC R3
    Close -1651y 11mo before
Yadong — win / loss by method
Record: 14-5-0, 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
5 wins, 1 loss
W
36% of wins
L
20% of losses
Submission
3 wins, 0 losses
W
21% of wins
L
0% of losses
Decision
6 wins, 3 losses
W
43% of wins
L
60% of losses
DQ / other
0 wins, 1 loss
W
0% of wins
L
20% of losses
UFC
3win0loss0draw0NC
WinsLosses
1 (33%)KO/TKO() 0
1 (33%)Submission() 0
1 (33%)Decision() 0
Non-UFC
11win5loss0draw1NC
WinsLosses
4 (36%)KO/TKO(20%) 1
2 (18%)Submission(0%) 0
5 (45%)Decision(60%) 3
0 (0%)DQ / other(20%) 1
Perez — win / loss by method
Record: 24-7-1

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
10 wins, 1 loss
W
42% of wins
L
14% of losses
Submission
6 wins, 3 losses
W
25% of wins
L
43% of losses
Decision
8 wins, 3 losses
W
33% of wins
L
43% of losses
UFC
7win2loss1draw0NC
WinsLosses
3 (43%)KO/TKO(0%) 0
0 (0%)Submission(50%) 1
4 (57%)Decision(50%) 1
Non-UFC
17win5loss0draw0NC
WinsLosses
7 (41%)KO/TKO(20%) 1
6 (35%)Submission(40%) 2
4 (24%)Decision(40%) 2

Profiles

Experience
Yadong
Perez
3
UFC fights
10
29.3 min · 9.8 avg
Octagon time
112.6 min · 11.3 avg
13y 2m
Career length
21y 0m
UFC schedule strength

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

Yadong
Perez
31W–13L · 70.5%
Overall
130W–46L · 73.9%
31W–13L · 70.5%
Wins
106W–40L · 72.6%
0W–0L
Losses
24W–6L · 80.0%
Non-UFC schedule strength
Yadong
Perez
83W–34L · 70.9%
Overall
60W–31L · 65.9%
42W–15L · 73.7%
Wins
36W–23L · 61.0%
41W–19L · 68.3%
Losses
24W–8L · 75.0%
Distance striking
Yadong
Perez
4.90
Landed / min
3.42
37.3%
Accuracy
31.8%
68.9%
Defense
65.3%
1.03
Knockdowns / 15 min
0.00
66.3%
Time at distance
81.6%
Grappling & control
Yadong
Perez
1.54
Takedowns / 15 min
0.53
100.0%
Takedown accuracy
20.0%
100.0%
Takedown defense
73.3%
1.03
Sub attempts / 15 min
0.13
96.3%
Control share
44.2%
Strike target map
Yadong
  • Head69%(87)div 63%
  • Body17%(21)div 21%
  • Legs14%(18)div 16%
Perez
  • Head62%(251)div 63%
  • Body10%(42)div 21%
  • Legs27%(110)div 16%

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

Song Yadong
CloseSSTDKDCtrl

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

Alejandro Perez
CloseSSTDKDCtrl

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