// Roster Index›Light Heavyweight›Dossier · Jake O'Brien
UFC FIGHTER PROFILE_
UFC · UNKNOWNLIGHT HEAVYWEIGHT

Jake
O'Brien

NICKNAME"Irish"·UNITED STATES
PROFESSIONAL RECORD
15-4-0
CURRENT FORM
2W STREAK
NEXT FIGHT
NO BOUT ANNOUNCED
Jake O'Brien
FIGHTER -
UNI🇺🇸
PROFILE PHOTO
PROFILE
PROFILE DATA! COLD
HEIGHT
6'3"
REACH
6'4"
AGE
42
STANCE
ORTHODOX
WEIGHT
Light Heavyweight
PROFESSIONAL RECORD_
19 BOUTS
WIN
15
LOSS
4
DRAW
0
WIN RATE
79%
15/19 bouts
FINISH RATE
67%
of professional wins
LAST 5 FIGHTS2W STREAK · 4-1
WWLWW
STYLE SUMMARY_
DATA: COLD
FIGHTING STYLE
WELL ROUNDED

Well rounded fighter with no dominant single weapon — 47% of wins are by ko/tko.

KEY STRENGTHS

Closes distance and trades — most wins come from heavy hands inside the first two rounds.

KEY RISKS

Pressure boxers willing to wade into the pocket have found chins on offer; cardio drops in late rounds.

// PERFORMANCE_METRICS · 02_

STRIKE / GRAPPLE
VITALS

Observed profile rates compared with stored weight-class medians where coverage exists. Any fallback uses a labeled UFC reference average; no fallback is presented as a division median.

// SLPM▼ BELOW
1.31
Strikes Landed/Min
Reference value 2.75
// STR. ACC▼ BELOW
31%
Striking Accuracy
Reference value 49%
// SAPM▲ ABOVE
1.92
Strikes Absorbed/Min
Reference value 2.75
// STR. DEF▲ ABOVE
69%
Striking Defense
Reference value 53%
// TD AVG▲ ABOVE
6.39
Takedowns/15 min
Reference value 1.50
// TD ACC▲ ABOVE
54%
Takedown Accuracy
Reference value 40%
// TD DEF▼ BELOW
25%
Takedown Defense
Reference value 59%
// SUB AVG▼ BELOW
0.20
Submissions/15 min
Reference value 0.50
// QUALITY_OF_COMPETITION · 02B_

WHO THEY
ACTUALLY FOUGHT

A record says how often a fighter won, not against whom. These ratings weigh every result by the opponent's strength at the time, then compare this fighter with the 56 rated fighters on the UFC light heavyweight roster (anyone with a UFC bout in the last two years or one booked).

// RATING
#35
against the 56 rated on the UFC light heavyweight roster · Elo 1527
// STRENGTH OF SCHEDULE
61st
percentile · average opponent rated 1557 at fight time (recent fights count most)
// RESULTS VS EXPECTATION
38th
percentile · fell short of what opponents' ratings predicted (-0.07 per fight)

10 rated fights · opponents rated in 59% of recorded fights · last rated fight JUL 10, 2010

// CAREER_BREAKDOWN · 03_

WIN CONDITION MAP

Where the wins come from, and where the losses came from. Method splits by knockout, submission, and decision.

// WINS (15)
n = 15
KO/TKO · 7
SUB · 3
DEC · 5
7
KO/TKO
47%
3
SUB
20%
5
DEC
33%
// LOSSES (4)
n = 4
KO/TKO · 2
SUB · 2
2
KO/TKO
50%
2
SUB
50%
0
DEC
0%
// PATH_TO_VICTORY_
67% FINISH
KO/TKOEARLY ROUNDS · 7 fights
47%
SUBANY ROUND · 3 fights
20%
DECFULL FIGHT · 5 fights
33%
Top win condition: ko/tko · early rounds.
// DNA_PROFILE · 04_

ATTRIBUTE FINGERPRINT

Evidence-backed 0-100 scores built only from observed profile stats and disclosed bout-history proxies. This is a fixed Blueprint scoring model, not a division percentile; missing axes remain unknown.

// DNA_PROFILE_
3 OBSERVED7 DERIVED0 UNKNOWN
// BENCHMARK
FIXED SCORE SCALE
// LINKED SAMPLE
19 BOUTS
// PROFILE UPDATED
OCT 3, 2026
// RECORDED SOURCE
ufcstats
Fighter attribute fingerprint10 of 10 attributes have evidence-backed scores on the Blueprint fixed scale. Unknown axes are not plotted and no score represents a division percentile.KO POWER67TD DEFENSE20GRAPPLING60CHIN75STRIKING20CARDIO70AGGRESSION47SUB THREAT20STR DEFENSE87RECOVERY75
// BANDS
90+ELITE
70-89STRONG
45-69AVERAGE
30-44BELOW
<30LOW
N/AUNKNOWN
Highest scored axis: Str Defense. Lowest scored axis: Sub Threat.
// EVIDENCE REGISTER
10 SCORED · 0 OPEN
KO Power67
DERIVED PROXY

KO wins divided by total career wins

N=15 wins
TD Defense20
OBSERVED INPUT

Observed takedown defense rate (25%)

Grappling60
DERIVED PROXY

Composite of observed takedown volume, accuracy, and submission rate

Chin75
DERIVED PROXY

KO-loss durability proxy from career record

N=19 bouts
Striking20
DERIVED PROXY

Composite of observed striking volume and accuracy

Cardio70
DERIVED PROXY

Long-fight exposure proxy from bout duration and decision-win share

Aggression47
DERIVED PROXY

Activity proxy from observed strike and takedown volume

Sub Threat20
OBSERVED INPUT

Observed submission rate (0.2 per 15 min)

Str Defense87
OBSERVED INPUT

Observed striking defense rate (69%)

Recovery75
DERIVED PROXY

Share of recorded losses followed by a win in the next recorded bout.

N=4 losses
Fighter attribute fingerprint accessible data summary
AttributeScoreProvenanceEvidenceSample
KO Power67 out of 100DERIVED PROXYKO wins divided by total career wins15 wins
TD Defense20 out of 100OBSERVED INPUTObserved takedown defense rate (25%)Not recorded
Grappling60 out of 100DERIVED PROXYComposite of observed takedown volume, accuracy, and submission rateNot recorded
Chin75 out of 100DERIVED PROXYKO-loss durability proxy from career record19 bouts
Striking20 out of 100DERIVED PROXYComposite of observed striking volume and accuracyNot recorded
Cardio70 out of 100DERIVED PROXYLong-fight exposure proxy from bout duration and decision-win shareNot recorded
Aggression47 out of 100DERIVED PROXYActivity proxy from observed strike and takedown volumeNot recorded
Sub Threat20 out of 100OBSERVED INPUTObserved submission rate (0.2 per 15 min)Not recorded
Str Defense87 out of 100OBSERVED INPUTObserved striking defense rate (69%)Not recorded
Recovery75 out of 100DERIVED PROXYShare of recorded losses followed by a win in the next recorded bout.4 losses
// CAREER_MOMENTUM · 05_

THE ARC SO FAR

Rolling momentum score (0-100) recomputed after every bout. Weighted blend of result, opponent context, and method-of-finish, designed to show the shape, not the destination.

// MOMENTUM_TIMELINE_
SCOREWINLOSS
0255075100MAY 2005WMAY 2005WJUN 2005WJAN 2006WJAN 2006WMAR 2006WAPR 2006WJUN 2006WAUG 2006WNOV 2006WJAN 2007LMAR 2008LJUL 2008WJAN 2009LJUL 2009WFEB 2010WMAR 2010LJUL 2010WMAR 2012WAUG 2012// SCORE

  1. Start, MAY 2005, momentum score 45.
  2. Start, MAY 2005, momentum score 56, KO/TKO R1.
  3. Start, JUN 2005, momentum score 66, KO/TKO R1.
  4. Start, JAN 2006, momentum score 77, KO/TKO R1.
  5. Start, JAN 2006, momentum score 87, KO/TKO R1.
  6. Start, MAR 2006, momentum score 98, KO/TKO R1.
  7. Start, APR 2006, momentum score 100, KO/TKO R1.
  8. Start, JUN 2006, momentum score 100, SUB R1.
  9. Start, AUG 2006, momentum score 100, KO/TKO R2.
  10. Start, NOV 2006, momentum score 100, DEC R3.
  11. Start, JAN 2007, momentum score 100, DEC R3.
  12. Start, MAR 2008, momentum score 93, KO/TKO R2.
  13. Start, JUL 2008, momentum score 83, KO/TKO R1.
  14. Start, JAN 2009, momentum score 90, DEC R3.
  15. Start, JUL 2009, momentum score 83, SUB R2.
  16. Start, FEB 2010, momentum score 93, SUB R2.
  17. Start, MAR 2010, momentum score 100, DEC R3.
  18. Start, JUL 2010, momentum score 93, SUB R1.
  19. Start, MAR 2012, momentum score 100, SUB R1.
  20. Start, AUG 2012, momentum score 100, DEC R3.

Peaked at 100 (W vs Hayes), bottomed at 45 (Debut). Current reading: 100.

// KILL_SHOT_MATRIX · 06_

WHEN THE FINISHES COME

Cross-tab of fight outcome by method and round. Reads top-down for method, left-right for round. Cyan intensity scales with frequency.

// METHOD × ROUND_
19/19 fights mapped
METHOD ↓ / ROUND →R1R2R3R4R5FREQ
KO/TKO
7
37%
2
11%
-
-
-
9
total
SUB
3
16%
2
11%
-
-
-
5
total
DEC
-
-
5
26%
-
-
5
total
// PRIMARY KILL ZONE
R1-R2 KO/TKO · 9 of 19 mapped
// LATE-FIGHT GAP
No R5 finishes either way
// DECISION RATE
26%, fights rarely go the distance
// FIGHT_HISTORY · 08_

BOUT LOG
19 FIGHTS

Detailed bout records for the indexed tenure. Sorted most recent first.

W
VS Miodrag PetkovicAug 4, 2012
DecisionR3 · 5:00
Flawless FC 1 - The Beginning
SECONDARY DETAILS
METHOD
DETAIL
Decision (Unanimous)
W
VS James ShawMar 31, 2012
SubmissionR1 · 1:06
IMMA - Indy MMA 2
SECONDARY DETAILS
METHOD
DETAIL
Submission (Arm-Triangle Choke)
L
VS Gegard MousasiJul 10, 2010
SubmissionR1 · 0:31
Dream - Dream 15
SECONDARY DETAILS
METHOD
DETAIL
Submission (Guillotine Choke)
W
VS Toni ValtonenMar 13, 2010
DecisionR3 · 5:00
FF 27 - Fight Festival 27
SECONDARY DETAILS
METHOD
DETAIL
Decision (Unanimous)
W
VS Dave HessFeb 20, 2010
SubmissionR2 · 4:24
MMA Big Show - Triple Threat
SECONDARY DETAILS
METHOD
DETAIL
Submission (Kimura)
L
VS Jon JonesJul 11, 2009
SubmissionR2 · 2:43
UFC 100 - Lesnar vs. Mir 2
SECONDARY DETAILS
METHOD
DETAIL
Submission (Guillotine Choke)
W
VS Christian WellischJan 31, 2009
DecisionR3 · 5:00
UFC 94 - St. Pierre vs. Penn 2
SECONDARY DETAILS
METHOD
DETAIL
Decision (Split)
L
VS Cain VelasquezJul 19, 2008
KO/TKOR1 · 2:02
UFC Fight Night 14 - Silva vs. Irvin
SECONDARY DETAILS
METHOD
DETAIL
TKO (Punches)
L
VS Andrei ArlovskiMar 1, 2008
KO/TKOR2 · 4:17
UFC 82 - Pride of a Champion
SECONDARY DETAILS
METHOD
DETAIL
TKO (Punches)
W
VS Heath HerringJan 25, 2007
DecisionR3 · 5:00
UFC Fight Night 8 - Evans vs. Salmon
SECONDARY DETAILS
METHOD
DETAIL
Decision (Unanimous)
W
VS Josh SchockmanNov 18, 2006
DecisionR3 · 5:00
UFC 65 - Bad Intentions
SECONDARY DETAILS
METHOD
DETAIL
Decision (Unanimous)
W
VS Kristof MidouxAug 17, 2006
KO/TKOR2 · 0:52
UFC Fight Night 6 - Sanchez vs. Parisyan
SECONDARY DETAILS
METHOD
DETAIL
TKO (Punches)
// FAQ · 09_

CITATION-READY ANSWERS

Quick answers based on the public fighter profile and fight history shown on this page.

Light Heavyweight. Professional record 15-4. Unranked at the time of indexing.

Research Jake O'Brien

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// FORECAST_AVAILABLE_
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// LAST INDEX SYNC · 2026-10-28