Jake O'Brien
15–4 · 19 recorded bouts · 2005–2012
15–4
Jake O'Brien finished 67% of 15 wins inside the distance — the 19th percentile for heavyweight MMA, where the median is 85%. No reach is on record, so this page compares record rather than measurements.
SOURCE·Jake O'Brien (fighter) — English Wikipedia (CC BY-SA 4.0)·derived figures computed here·REVIEWED 2026-02-17
How this record is compiled
- Measurements come from the fighter's English Wikipedia infobox; the bout list is parsed from the results table on the same article, read on 2026-02-17. Boxing tables are read by header name and MMA records by the fixed column order of the
MMA recordtemplate — two different parsers, because reading MMA rows as a boxing table returns a fighter's boxing record in place of their real one. - A bout enters the ledger with whatever fields the source states: result, opponent, method, round, year. Any field the source leaves empty stays empty here. A date that cannot be established is left blank rather than inferred, and the bout is still counted.
- A no contest is counted and printed as a no contest. It is never folded into the wins, the losses or the draws, and it never disappears to make a total balance.
- Where the article's infobox total disagrees with its own results table, both figures are published and each is labelled with where it came from. Nothing is averaged and nothing is reconciled against a second database.
- Percentiles rank this fighter among the 324 heavyweight MMA fighters in the dataset — the most specific group of at least 30 that this fighter belongs to.
Bout record
Every bout the article's own results table lists, in order. A dash is a field the source leaves empty — it is not a zero and it is not a guess.
| Year | Result | Opponent | Method | Rd |
|---|---|---|---|---|
| 2012 | W | Miodrag Petkovic | Decision | 3 |
| 2012 | W | James Shaw | Submission | 1 |
| 2010 | L | Gegard Mousasi | Submission | 1 |
| 2010 | W | Toni Valtonen | Decision | 3 |
| 2010 | W | Dave Hess | Submission | 2 |
| 2009 | L | Jon Jones | Submission | 2 |
| 2009 | W | Christian Wellisch | Decision | 3 |
| 2008 | L | Cain Velasquez | KO/TKO | 1 |
| 2008 | L | Andrei Arlovski | KO/TKO | 2 |
| 2007 | W | Heath Herring | Decision | 3 |
| 2006 | W | Josh Schockman | Decision | 3 |
| 2006 | W | Kristof Midoux | KO/TKO | 2 |
| 2006 | W | Pat Harmon | Submission | 1 |
| 2006 | W | Antoine Hayes | KO/TKO | 1 |
| 2006 | W | Jay White | KO/TKO | 1 |
| 2006 | W | Johnathan Ivey | KO/TKO | 1 |
| 2006 | W | Anthony Ferguson | KO/TKO | 1 |
| 2005 | W | Paul Bowers | KO/TKO | 1 |
| 2005 | W | Chris Clark | KO/TKO | 1 |
6 of these opponents have their own page here.
SOURCE·Jake O'Brien (fighter) — English Wikipedia (CC BY-SA 4.0)·derived figures computed here·REVIEWED 2026-02-17
What is on record
| Reach | not recorded | |
|---|---|---|
| Height | 75″ (190.5 cm) | |
| Stance | — | |
| Division | Heavyweight MMA competed at 2: light heavyweight, heavyweight — compared here against the last | |
| Most active decade | 2000s — 14 of 19 dated bouts | |
| Country | United States |
Wikipedia carries no reach figure for Jake O'Brien, so the reach-advantage comparison this site is built on cannot be computed. Everything below comes from the record instead.
Record
MMA record
15–4
19 bouts on record
Finish rate
67%
of wins ended inside the distance — heavyweight MMA median 85%, 19th percentile
The career, bout by bout
19 recorded bouts from 2005 to 2012. Every incumbent shows this as a table you have to read; here it is as a shape you can see.
Career span
8y
2005–2012
Longest unbeaten run
10
without a loss — draws do not break it
Busiest year
2006
7 bouts
Recorded bouts
19
19 with a date
What this record does and does not say
- What is Jake O'Brien's record?
- 15–4 in MMA. That is the aggregate stated in the English Wikipedia infobox; the results table on the same article lists 19 bouts individually.
- Does a no contest change a record here?
- No. A no contest is not a win, a loss or a draw, and it is never folded into one. It is counted and printed separately, so a 20–0 record with two no contests is shown as exactly that rather than as 22–0 or as 20–0 with the no contests dropped. The same applies to a bout overturned after the fact where the source records the change.
- What happens when sources disagree about a fight?
- This site publishes one source — the fighter's English Wikipedia article, read on the date printed under every table — and it does not silently reconcile that against anyone else's database. Where the article's own infobox total and its own results table disagree, both are shown and the page says which one each figure came from. Nothing is averaged, and no field is filled in from a second source to make a total balance.
Where this record leads
The 335 heavyweight MMA fighters this record is ranked against, and the distribution O'Brien sits inside.
335 FIGHTERS 2000s MMA14 of these bouts fall in the 2000s. This is what the rest of that decade's records look like.
541 FIGHTERS Jake O'Brien vs Jon JonesA bout both records confirm — set out side by side, with every opponent the two men have in common.
2009 Longest unbeaten runsJake O'Brien went 10 without a loss. This is where that sits against every run on the site.
LEADERBOARD