Jake O'Brien (15-4, 9) was born in Indianapolis, Indiana, U.S. on September 25, 1984. At the age of 20 years on May 21, 2005, he made his professional MMA debut against Chris Clark, winning the fight via 1st-round TKO.
On August 17, 2006, 21-year old Jake O'Brien made his UFC debut on his 8th professional MMA fight at UFC Fight Night: Sanchez vs. Parisyan against Kristof Midoux, winning the fight in the 2nd round via TKO.
O'Brien's last fight was a 3-round unanimous decision win against Miodrag Petkovic at age 27 on August 4, 2012. He retired with a 2-fight winning streak.
He has fought seven times in the UFC, and has a record of 4 wins and 3 losses in the promotion.
Some of Jake O'Brien's best fights have been against Kristof Midoux, Josh Schockman, Heath Herring, Christian Wellisch and Jay White. For details about these fights refer to "Best fights of Jake O'Brien".
O'Brien has 4 losses on his MMA record. For details about these losses refer to "Jake O'Brien Losses".
| # | Date | Opponent | Promotion | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|---|
19 | Aug 4, 2012 27 years, 10 months 15-4 (9) | Miodrag Petkovic | LHW | 3 | UD | WIN | |
18 | Mar 31, 2012 27 years, 6 months 14-4 (9) | James Shaw | LHW | 1 | SUB | WIN Arm-triangle choke | |
17  | Jul 10, 2010 25 years, 9 months 13-4 (8) | 24 years, 11 months 28-3-1 (26) | DREAM | LHW | 1 | SUB | LOSS Standing guillotine choke |
16 | Mar 13, 2010 25 years, 5 months 13-3 (8) | Toni Valtonen | LHW | 3 | UD | WIN | |
15 | Feb 20, 2010 25 years, 4 months 12-3 (8) | Dave Hess | LHW | 2 | SUB | WIN Kimura | |
14  | Jul 11, 2009 24 years, 9 months 11-3 (7) | 21 years, 11 months 8-0 (6) | UFC | LHW | 2 | SUB | LOSS Guillotine choke |
13  | Jan 31, 2009 24 years, 4 months 11-2 (7) | 33 years, 4 months 8-4 (7) | UFC | LHW | 3 | SD | WIN |
12  | Jul 19, 2008 23 years, 9 months 10-2 (7) | 25 years, 11 months 3-0 (3) | UFC | 1 | TKO | LOSS Punches | |
11  | Mar 1, 2008 23 years, 5 months 10-1 (7) | 29 years 12-5 (11) | UFC | 2 | TKO | LOSS Punches | |
10  | Jan 25, 2007 22 years, 4 months 10-0 (7) | 28 years, 10 months 26-11 (23) | UFC | 3 | UD | WIN | |
9 | Nov 18, 2006 22 years, 1 months 9-0 (7) | Josh Schockman | UFC | 3 | UD | WIN | |
8 | Aug 17, 2006 21 years, 10 months 8-0 (7) | Kristof Midoux | UFC | 2 | TKO | WIN Referee stoppage | |
7 | Jun 23, 2006 21 years, 8 months 7-0 (6) | Pat Harmon | 1 | CKO | WIN Rear-naked choke | ||
6 | Apr 7, 2006 21 years, 6 months 6-0 (6) | Antoine Hayes | 1 | TKO | WIN Punches | ||
5 | Mar 17, 2006 21 years, 5 months 5-0 (5) | Jay White | WEC | 1 | KO | WIN Punch | |
4 | Jan 20, 2006 21 years, 3 months 4-0 (4) | Johnathan Ivey | 1 | TKO | WIN Punches | ||
3 | Jan 7, 2006 21 years, 3 months 3-0 (3) | Anthony Ferguson | 1 | TKO | WIN Punches | ||
2 | Jun 21, 2005 20 years, 8 months 2-0 (2) | Paul Bowers | 1 | TKO | WIN Punches | ||
1 | May 21, 2005 20 years, 7 months 1-0 (1) | Chris Clark | 1 | TKO | WIN Referee stoppage |
