| Sieg | 50-18-1 (1) | George Sullivan  | KO (Punches) |  | Ring of Combat 70 | Nov 23, 2019 | 3 | 2:08 | Atlantic City, New Jersey, United States |
| Sieg | 49-18-1 (1) | Jared Torgeson | TKO (Punches) |  | Fusion Fight League: Diesel's Last Ride | Apr 13, 2019 | 1 | 3:31 | Great Falls, Montana, United States |
| Sieg | 48-18-1 (1) | Dan Yates | TKO (Punches) |  | KOP 63 | Jan 04, 2019 | 1 | 3:31 | Muskegon, Michigan, United States |
| Niederlage | 47-18-1 (1) | Artem Frolov  | TKO (Leg Injury) |  | M-1 Challenge 93 | Jun 01, 2018 | 2 | 0:46 | Chelyabinsk, Russia |
| Unentschieden | 47-17-1 (1) | Boris Polezhay  | Draw (Split) |  | M-1 Challenge 90: Kunchenko vs Butenko | Mar 30, 2018 | 3 | 5:00 | St. Petersburg, Russia |
| Sieg | 47-17 (1) | Oleg Olenichev | TKO (Punches) |  | M-1 Challenge 84: Kunchenko vs Romanov | Oct 27, 2017 | 3 | 3:21 | St. Petersburg, Russia |
| Sieg | 46-17 (1) | Shonie Carter | Submission (strikes) |  | ZPromotions: Fight Night Medicine Hat 4 | Sep 09, 2017 | 2 | 4:54 | Medicine Hat, Alberta, Canada |
| Sieg | 45-17 (1) | Dmitry Samoilov | TKO (Punches) |  | M-1 Challenge 81: Battle in the mountains 6 | Jul 22, 2017 | 3 | 1:24 | Nazran, Russia |
| Sieg | 44-17 (1) | Jerome Jones | TKO (punches) |  | WXC 68 | Apr 08, 2017 | 1 | 0:27 | Ypsilanti, Michigan, United States |
| Sieg | 43-17 (1) | Billy Martin | TKO (Punches) |  | ICF 27 - The Last Stand | Apr 08, 2017 | 1 | 1:48 | Great Falls, Montana, United States |
| Sieg | 42-17 (1) | Cody McKenzie | TKO (punches) | | Z Promotions: Fight Night Medicine Hat 2 | Oct 28, 2016 | 1 | 1:51 | Medicine Hat, Alberta, Canada |
| Niederlage | 41-17 (1) | Chris Camozzi | TKO (knees) | | UFC Fight Night 83: Cowboy vs Olveira | Feb 21, 2016 | 1 | 0:26 | Pittsburgh, United States |
| Sieg | 41-16 (1) | Ron Stallings | DQ (Illegal Upkick) | | UFC 191: Johnson vs Dodson 2 | Sep 05, 2015 | 2 | 2:28 | Las Vegas, United States |
| Niederlage | 40-16 (1) | Patrick Côté  | Decision (unanimous) |  | UFC 186 | Apr 25, 2015 | 3 | 5:00 | Montreal, Quebec, Canada |
| Niederlage | 40-15 (1) | Ben Saunders | TKO (neck injury) | | UFC on Fox: dos Santos vs. Miocic | Dec 13, 2014 | 1 | 0:57 | Phoenix, Arizona, United States |
| Sieg | 40-14 (1) | Mike Bronzoulis | Decision (unanimous) | | Bellator 106 | Nov 02, 2013 | 3 | 5:00 | Long Beach, California, United States |
| Sieg | 39-14 (1) | Cris Leyva | TKO (punches) | | RITC 164 | Nov 16, 2012 | 1 | 2:28 | Chandler, Arizona, United States |
| Sieg | 38-14 (1) | Josh Cavan | KO (punches) | | Made For War 1 | Oct 13, 2012 | 1 | 4:16 | Castle Rock, Colorado, United States |
| Sieg | 37-14 (1) | Shane Johnson | KO (punch) | | RITC 160 | Jun 22, 2012 | 2 | 2:33 | Chandler, Arizona, United States |
| Sieg | 36-14 (1) | Aaron Brink | Submission (armbar) | | RITC 159 | May 11, 2012 | 2 | 1:18 | Chandler, Arizona, United States |
| Sieg | 35-14 (1) | Shannon Ritch | TKO (punches) | | Duel for Domination | Nov 26, 2011 | 1 | 0:56 | Phoenix, Arizona, United States |
| Niederlage | 34-14 (1) | Kendall Grove | Submission | | ProElite: Arlovski vs. Lopez | Aug 27, 2011 | 1 | 0:59 | Honolulu, Hawaii, US |
| Niederlage | 34-13 (1) | Bryan Baker | KO (punch) | | Bellator 43 | May 07, 2011 | 2 | 3:53 | Newkirk, Oklahoma, United States |
| Niederlage | 34-12 (1) | Jordan Mein | TKO (punches) | | Wreck MMA: Strong & Proud | Jan 28, 2011 | 2 | 4:30 | Gatineau, Quebec, Canada |
| Sieg | 34-11 (1) | Trent Thorne | TKO (elbows) | | KOTC: 48 | Nov 21, 2010 | 1 | 3:56 | Edmonton, Alberta, Canada |
| Sieg | 33-11 (1) | Louis Taylor | Submission (punches) | | Strikeforce Challengers: Riggs vs. Taylor | Aug 13, 2010 | 3 | 2:07 | Phoenix, Arizona, United States |
| Niederlage | 32-11 (1) | Jay Hieron | Decision (unanimous) | | Strikeforce: Miami | Jan 30, 2010 | 3 | 5:00 | Sunrise, Florida, United States |
| Sieg | 32-10 (1) | Nick Almen | Submission (punches and elbows) | | Ironman MMA 1 | Dec 11, 2009 | 1 | 1:51 | Welch, Minnesota, United States |
| Sieg | 31-10 (1) | David Barnes | TKO (punches) | | RITC 138 | Dec 04, 2009 | 1 | 0:57 | Mesa, Arizona, United States |
| Sieg | 30-10 (1) | Phil Baroni | Decision (unanimous) | | Strikeforce: Lawler vs. Shields | Jun 06, 2009 | 3 | 5:00 | St. Louis, Missouri, United States |
| Sieg | 29-10 (1) | Luke Stewart | TKO (punches) | | Strikeforce: Destruction | Nov 21, 2008 | 2 | 2:05 | San Jose, California, United States |
| Niederlage | 28-10 (1) | Kazuo Misaki | TKO (punches) | | Strikeforce: At The Mansion II | Sep 20, 2008 | 2 | 2:29 | Beverly Hills, California, United States |
| Sieg | 28-9 (1) | Matt Dempsey | Submission (rear-naked choke) | | RITC 112 | Jul 26, 2008 | 2 | 1:47 | Prescott, Arizona, United States |
| Niederlage | 27-9 (1) | Cory Devela | Submission (slam) | | Strikeforce: At The Dome | Feb 23, 2008 | 1 | 1:22 | Tacoma, Washington, United States |
| Sieg | 27-8 (1) | Eugene Jackson | KO (punches) | | Strikeforce: Playboy Mansion | Sep 29, 2007 | 1 | 3:56 | Beverly Hills, California, United States |
| Sieg | 26-8 (1) | Dan Chambers | Submission (triangle choke) | | Hardcore Championship Fighting: Unfinished Business | Jul 21, 2007 | 1 | 3:25 | Edmonton, Alberta, Canada |
| Niederlage | 25-8 (1) | Diego Sanchez | KO (knee) | | UFC Fight Night: Sanchez vs. Riggs | Dec 13, 2006 | 1 | 1:33 | San Diego, California, United States |
| Sieg | 25-7 (1) | Jason Von Flue | Submission (triangle choke) | | UFC Fight Night 6 | Aug 17, 2006 | 1 | 2:01 | Las Vegas, Nevada, United States |
| Niederlage | 24-7 (1) | Mike Swick | Submission (guillotine choke) | | UFC 60 | May 27, 2006 | 1 | 2:19 | Los Angeles, California, United States |
| Sieg | 24-6 (1) | Nick Diaz | Decision (unanimous) | | UFC 57 | Feb 04, 2006 | 3 | 5:00 | Nevada, United States |
| Niederlage | 23-6 (1) | Matt Hughes | Submission (kimura) |  | UFC 56 | Nov 19, 2005 | 1 | 3:26 | Las Vegas, Nevada, United States |
| Sieg | 23-5 (1) | Chris Lytle | TKO (doctor stoppage) | | UFC 55 | Oct 07, 2005 | 2 | 2:00 | Uncasville, Connecticut, United States |
| Sieg | 22-5 (1) | Rob Kimmons | Submission (punches) | | WEC 15 | May 19, 2005 | 1 | 1:24 | Lemoore, California, United States |
| Niederlage | 21-5 (1) | Ivan Salaverry | Submission (triangle choke) | | UFC 52 | Apr 16, 2005 | 1 | 2:42 | Las Vegas, Nevada, United States |
| Sieg | 21-4 (1) | Thomas Gil | Submission (armbar) | | RITC 66 | Nov 13, 2004 | 1 | 2:05 | Phoenix, Arizona, United States |
| Sieg | 20-4 (1) | Isidro Gonzalez | TKO (punches and elbows) | | WEC 12 | Oct 21, 2004 | 1 | 1:50 | Lemoore, California, United States |
| Sieg | 19-4 (1) | Joe Doerksen | Submission (elbows) | | UFC 49 | Aug 21, 2004 | 2 | 3:37 | Las Vegas, Nevada, United States |
| Sieg | 18-4 (1) | Shane Johnson | KO (punches) | | XCF 5: Evolution | May 28, 2004 | 1 | N/A | Phoenix, Arizona, United States |
| Sieg | 17-4 (1) | Kendall Grove | KO (elbows) | | Rumble on the Rock 5 | May 07, 2004 | 1 | 3:09 | Honolulu, Hawaii, US |
| Sieg | 16-4 (1) | Dave Vitkay | KO (punches) | | ICC: Trials 2 | Apr 30, 2004 | 1 | N/A | Minnesota, United States |
| Sieg | 15-4 (1) | John Renken | KO (punch) | | RITC 60: 'The Saint' Goes Marching In | Mar 20, 2004 | 1 | 0:28 | Phoenix, Arizona, United States |
| Sieg | 14-4 (1) | Chris Kiever | KO (punch) | | IFC: Battleground Tahoe | Jan 31, 2004 | 1 | 0:49 | Lake Tahoe, Nevada, United States |
| Niederlage | 13-4 (1) | Alex Stiebling | Submission (triangle choke) | | WEC 9 | Jan 16, 2004 | 2 | 1:54 | Lemoore, California, United States |
| Sieg | 13-3 (1) | Cory Timmerman | Submission (armbar) | | RITC 57: Tucson Revisited | Dec 13, 2003 | 1 | 1:11 | Tucson, Arizona, United States |
| Sieg | 12-3 (1) | Frank Alcala | TKO (punches) | | IFC: Rumble on the Rio | Dec 06, 2003 | 1 | 0:31 | Hidalgo, Texas, United States |
| NC | 11-3 (1) | Andy Montana | No Contest | | RITC 53: The Beat Goes On | Sep 13, 2003 | - | N/A | Phoenix, Arizona, United States |
| Sieg | 11-3 | Greg Wikan | TKO (corner stoppage) | | ECS: Evolution | Jul 19, 2003 | 3 | 5:00 | Phoenix, Arizona, United States |
| Sieg | 10-3 | Will Hammond | TKO (punches) | | Art of War 2 | Jun 21, 2003 | 1 | N/A | Kalispell, Montana, United States |
| Niederlage | 9-3 | Travis Fulton | Submission (choke) | | RITC 45: Finally | Mar 01, 2003 | 1 | 0:48 | Phoenix, United States |
| Sieg | 9-2 | Herb Dean | Submission (punches) | | Rage in the Cage 43: The Match | Jan 18, 2003 | 1 | 0:52 | Arizona, United States |
| Niederlage | 8-2 | Wesley Correira | KO (knee and punch) | | Rumble on the Rock 1 | Dec 28, 2002 | 2 | 2:07 | Honolulu, Hawaii, United States |
| Sieg | 8-1 | Lemuel Vincent | TKO (punches) | | RITC 42: Road Trip | Dec 07, 2002 | 1 | 0:23 | Phoenix, Arizona, United States |
| Sieg | 7-1 | Allan Sullivan | Submission (armbar) | | RITC 39: Bring It | Oct 19, 2002 | 3 | 1:57 | Phoenix, Arizona, United States |
| Sieg | 6-1 | Joe Pardo | Decision (unanimous) | | RITC 38: Let's Roll | Sep 07, 2002 | 3 | 3:00 | Phoenix, Arizona, United States |
| Sieg | 5-1 | Jess Morton | TKO (retirement) | | RITC 36: The Rematch | Jun 22, 2002 | 1 | 3:00 | Phoenix, Arizona, United States |
| Sieg | 4-1 | Andy Montana | Submission (punches) | | RITC 35: This Time It's Personal | May 03, 2002 | 1 | 1:24 | Phoenix, Arizona, United States |
| Niederlage | 3-1 | Homer Moore | Decision (unanimous) | | RITC 34 | Mar 15, 2002 | 3 | 3:00 | Phoenix, Arizona, United States |
| Sieg | 3-0 | Joey Vigueria | Submission (punches) | | RITC 33: The Big Show | Feb 02, 2002 | 1 | 2:00 | Phoenix, Arizona, United States |
| Sieg | 2-0 | Justin Lyon | Submission (punches) | | RITC 31 | Nov 07, 2001 | 1 | 0:33 | Phoenix, Arizona, United States |
| Sieg | 1-0 | Ryan Roath | Submission (punches) | | RITC 30: Soaring to New Heights | Sep 26, 2001 | 1 | 2:32 | Phoenix, Arizona, United States |
