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UFC 307: Pereira vs. Rountree Jr.
Kayla Harrison
Kayla Harrison
17-1 · USA
VS
Ketlen Vieira
Ketlen Vieira
14-3 · BRA
October 5, 2024 · Salt Lake City, Utah, USA
Bantamweight · 3 rounds
136.0lb
Weigh-in
136.0lb
Kayla Harrison def. Ketlen Vieira by U-DEC, R3 5:00
Performance
Round by round
SSTDKDCtrl
R1
Harrison17/271/202:46
Vieira5/160/000:00
R2
Harrison15/350/202:02
Vieira14/320/000:00
R3
Harrison23/321/403:06
Vieira5/130/000:00
Total
Harrison55/942/807:54
Vieira24/610/000:00

Scorecards

Harrison vs Vieira

RdDerek ClearySal D'AmatoSteve FaragherCommunity
R110-910-910-910-9
R210-910-99-109.5-9.5
R310-910-910-910-9
Total30-2730-2729-2829.5-27.5

Media (15 cards) · avg 29.827.2 · 15 Harrison · 0 Vieira

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

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
HarrisonWin probabilityVieira
79.8%20.2%
KO / TKO
30%
Submission
13%
Decision
58%
Expected fight time: 11.0 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 Harrison, blue toward Vieira. Tap a bar for why.

Predicted outcomes
Harrison80%
Wins by
Model
Equity
Mkt
KO / TKO27%33%
Submission11%14%
Decision42%53%
Predicted output
Sig. strikes36 (1548)act 55
Takedowns2.0 (0.05.2)act 2
Vieira20%
Wins by
Model
Equity
Mkt
KO / TKO3%16%
Submission2%8%
Decision15%76%
Predicted output
Sig. strikes29 (1240)act 24
Takedowns0.6 (0.02.6)act 0
Combined totals~65 sig strikes~2.6 takedownsmkt —
How it ends
mkt —
R123%
R213%
R37%
Distance57%
Fighter props
Most sig. strikestie 1.4%
Harrison
55.5%-129
Vieira
+12943.0%
Most takedownstie 17.6%
Harrison
65.5%-387
Vieira
+38716.9%
Significant strikes — over/under
Harrison
Expected: 35.8
36
Over 36
38.8%
+154
Exactly 36
1.3%
push
Under 36
59.9%
-154
04590
Vieira
Expected: 29.4
29.5
Over 29.5
39.6%
+153
Under 29.5
60.4%
-153
03774
Takedowns — over/under
Harrison
Expected: 2.0
2
Over 2
40.3%
+101
Exactly 2
18.9%
push
Under 2
40.8%
-101
047
Vieira
Expected: 0.6
0.5
Over 0.5
40.3%
+148
Under 0.5
59.7%
-148
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 11.0 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
Harrison79.8%88.0%−8.2-1100
Vieira20.2%12.0%+8.2+700

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
98.8Striking57.5
Harrison +41.2
90.3Grappling60.6
Harrison +29.7
Str/minStr accStr defAbsorbedTD/15TD accTD defSubs
Hover a point to see the values
HarrisonVieira
Tale of the tape
Ratings (Elo)
1582
Pound-for-pound
1590
1583
Divisional
1590
1477
Striking offense
1480
1509
Striking defense
1498
1560
Grappling offense
1511
1551
Grappling defense
1532
Physical
34 yrs
Age
33 yrs
5'8"
Height
5'8"
66"
Reach
68"
Southpaw
Stance
Orthodox
Striking (UFC career)
7.52
Strikes landed / min
3.04
72%
Strike accuracy
41%
0.29
Strikes absorbed / min
3.92
83%
Strike defense
52%
Grappling (UFC career)
4.42
Takedowns / 15 min
1.51
40%
Takedown accuracy
45%
100%
Takedown defense
93%
2.2
Sub attempts / 15 min
0.6
Form & résumé
100%
UFC win rate
73%
+1
Win/loss streak
+1
100%
Last-5 win rate
60%
100%
Finish rate
13%
Recent opp. quality
175
Days since last fight
441
Recent form (last 5 UFC)
Kayla Harrison
  • WHolly HolmSUB R2
    Close -4546mo before
Ketlen Vieira
  • WPannie KianzadU-DEC R3
    Close -1561y 2mo before
  • LRaquel PenningtonS-DEC R3
    Close -1361y 9mo before
  • WHolly HolmS-DEC R5
    Close +1942y 5mo before
  • WMiesha TateU-DEC R5
    Close -1102y 10mo before
  • LYana SantosU-DEC R3
    Close -2753y 7mo before
Harrison — win / loss by method
Record: 17-1-0

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
6 wins, 0 losses
W
35% of wins
L
0% of losses
Submission
7 wins, 0 losses
W
41% of wins
L
0% of losses
Decision
4 wins, 1 loss
W
24% of wins
L
100% of losses
UFC
1win0loss0draw0NC
WinsLosses
0 (0%)KO/TKO() 0
1 (100%)Submission() 0
0 (0%)Decision() 0
Non-UFC
16win1loss0draw0NC
WinsLosses
6 (38%)KO/TKO(0%) 0
6 (38%)Submission(0%) 0
4 (25%)Decision(100%) 1
Vieira — win / loss by method
Record: 14-3-0

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
2 wins, 1 loss
W
14% of wins
L
33% of losses
Submission
4 wins, 0 losses
W
29% of wins
L
0% of losses
Decision
8 wins, 2 losses
W
57% of wins
L
67% of losses
UFC
8win3loss0draw0NC
WinsLosses
0 (0%)KO/TKO(33%) 1
1 (13%)Submission(0%) 0
7 (88%)Decision(67%) 2
Non-UFC
6win0loss0draw0NC
WinsLosses
2 (33%)KO/TKO() 0
3 (50%)Submission() 0
1 (17%)Decision() 0

Profiles

Experience
Harrison
Vieira
1
UFC fights
11
6.8 min · 6.8 avg
Octagon time
169.1 min · 15.4 avg
8y 1m
Career length
11y 10m
UFC schedule strength

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

Harrison
Vieira
15W–6L · 71.4%
Overall
121W–47L · 72.0%
15W–6L · 71.4%
Wins
83W–29L · 74.1%
0W–0L
Losses
38W–18L · 67.9%
Non-UFC schedule strength
Harrison
Vieira
145W–63L · 69.7%
Overall
2W–1L · 66.7%
127W–58L · 68.6%
Wins
2W–1L · 66.7%
18W–5L · 78.3%
Losses
0W–0L
Distance striking
Harrison
Vieira
3.98
Landed / min
4.98
40.0%
Accuracy
35.7%
90.0%
Defense
57.8%
0.00
Knockdowns / 15 min
0.00
22.2%
Time at distance
46.6%
Grappling & control
Harrison
Vieira
4.42
Takedowns / 15 min
1.51
40.0%
Takedown accuracy
44.7%
100.0%
Takedown defense
92.9%
2.21
Sub attempts / 15 min
0.62
95.1%
Control share
64.5%
Strike target map
Harrison
  • Head90%(46)div 62%
  • Body8%(4)div 21%
  • Legs2%(1)div 16%
Vieira
  • Head78%(400)div 62%
  • Body14%(74)div 21%
  • Legs8%(40)div 16%

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

Kayla Harrison
CloseSSTDKDCtrl

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

Ketlen Vieira
CloseSSTDKDCtrl

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