| Niederlage | 31-10 (1) | Ruslan Magomedov  | Decision (unanimous) |  | Fight Nights: Battle of Moscow 13 | Oct 26, 2013 | 3 | 5:00 | Moscow, Russia |
| Niederlage | 31-9 (1) | Tony Johnson  | TKO (Doctor Stoppage) |  | One FC 9 - Rise to Power | May 31, 2013 | 3 | 3:25 | Pasay, Philippines |
| Niederlage | 31-8 (1) | Satoshi Ishii  | Decision (Unanimous) |  | IGF - Inoki Bom-Ba-Ye 2012 | Dec 31, 2012 | 3 | 5:00 | Tokyo, Japan |
| NC | 31-7 (1) | Andrey Arlovski  | No Contest(TKO strikes) | | ONE FC 5: Pride of a Nation | Aug 31, 2012 | 2 | 4:46 | Manila, Philippines  |
| Sieg | 31-7 | Randy Smith | TKO (punches) |  | NEF - Fight Night 3 | Jun 16, 2012 | 1 | 0:12 | Lewiston, Maine, United States |
| Sieg | 30-7 | Andreas Kraniotakes  | Decision (unanimous) |  | ProElite: Big Guns | Nov 05, 2011 | 3 | 5:00 | Moline, Illinois, U.S. |
| Sieg | 29-7 | Patrick Barrentine | TKO (punches and elbows) | | Fight Tour | Aug 20, 2011 | 1 | 2:09 | Rockford, Illinois, U.S. |
| Niederlage | 28-7 | Abe Wagner | TKO (punches) | | Titan FC 16: Sylvia vs. Wagner | Jan 28, 2011 | 1 | 0:32 | Kansas City, Kansas, U.S. |
| Sieg | 28-6 | Vince Lucero | Submission (punches) | | CFX: Extreme Challenge on Target | Dec 11, 2010 | 1 | 2:42 | Minneapolis, Minnesota, U.S. |
| Sieg | 27-6 | Paul Buentello | KO (punch) | | PWP: War on the Mainland | Aug 14, 2010 | 2 | 4:57 | Irvine, California, U.S. |
| Sieg | 26-6 | Mariusz Pudzianowski  | Submission (punches) |  | Moosin: God of Martial Arts | May 21, 2010 | 2 | 1:43 | Worcester, U.S. |
| Sieg | 25-6 | Jason Riley | TKO (punches) | | Adrenaline MMA IV | Sep 18, 2009 | 1 | 2:32 | Council Bluffs, Iowa, U.S. |
| Niederlage | 24-6 | Ray Mercer | KO (punch) | | Adrenaline MMA 3: Bragging Rights | Jun 13, 2009 | 1 | 0:09 | Birmingham, Alabama, U.S. |
| Niederlage | 24-5 | Fedor Emelianenko | Submission (rear naked choke) |  | Affliction: Banned | Jul 19, 2008 | 1 | 0:36 | Anaheim, California, U.S. |
| Niederlage | 24-4 | Antonio Rodrigo Nogueira  | Submission (guillotine choke) | | UFC 81 | Feb 02, 2008 | 3 | 1:28 | Las Vegas, Nevada, U.S. |
| Sieg | 24-3 | Brandon Vera | Decision (unanimous) |  | UFC 77 | Oct 20, 2007 | 3 | 5:00 | Cincinnati, United States |
| Niederlage | 23-3 | Randy Couture | Decision (unanimous) | | UFC 68 | Mar 03, 2007 | 5 | 5:00 | Columbus, Ohio, United States |
| Sieg | 23-2 | Jeff Monson | Decision (unanimous) | | UFC 65 | Nov 18, 2006 | 5 | 5:00 | Sacramento, California, U.S. |
| Sieg | 22-2 | Andrey Arlovski | Decision (unanimous) | | UFC 61 | Jul 08, 2006 | 5 | 5:00 | Las Vegas, United States |
| Sieg | 21-2 | Andrey Arlovski | TKO (punches) | | UFC 59 | Apr 15, 2006 | 1 | 2:43 | Anaheim, United States |
| Sieg | 20-2 | Assuerio Silva | Decision (unanimous) | | UFC Ultimate Fight Night 3 | Jan 16, 2006 | 3 | 5:00 | Las Vegas, Nevada, U.S. |
| Sieg | 19-2 | Tra Telligman | KO (head kick) | | UFC 54 | Aug 20, 2005 | 1 | 4:59 | Las Vegas, Nevada, U.S. |
| Sieg | 18-2 | Mike Block | TKO (punches) | | IFC: Caged Combat | May 21, 2005 | 1 | 1:26 | Columbus, Ohio, U.S. |
| Niederlage | 17-2 | Andrey Arlovski | Submission (achilles lock) | | UFC 51 | Feb 05, 2005 | 1 | 0:47 | Las Vegas, United States |
| Sieg | 17-1 | Wes Sims | TKO (punches) | | Superbrawl 38 | Dec 12, 2004 | 1 | 1:32 | Honolulu, Hawaii, U.S. |
| Niederlage | 16-1 | Frank Mir | Technical submission | | UFC 48 | Jun 19, 2004 | 1 | 0:50 | Las Vegas, United States |
| Sieg | 16-0 | Gan McGee | TKO (punches) | | UFC 44 | Sep 26, 2003 | 1 | 1:54 | Las Vegas, Nevada, U.S. |
| Sieg | 15-0 | Ricco Rodriguez | TKO (punches) | | UFC 41 | Feb 28, 2003 | 1 | 3:09 | Atlantic City, New Jersey, U.S. |
| Sieg | 14-0 | Wesley Correira | TKO (corner stoppage) | | UFC 39 | Sep 27, 2002 | 2 | 1:43 | Uncasville, Connecticut, U.S. |
| Sieg | 13-0 | Jeff Gerlick | TKO (punches) | | Extreme Challenge 48 | Jul 27, 2002 | 1 | 3:17 | Tama, Iowa, U.S. |
| Sieg | 12-0 | Boyd Ballard | KO (knee) | | Superbrawl 24: ROTH 2 | Apr 27, 2002 | 1 | 3:21 | Honolulu, Hawaii, U.S. |
| Sieg | 11-0 | Jason Lambert | TKO (doctor stoppage) | | Superbrawl 24: ROTH 2 | Apr 27, 2002 | 2 | 4:13 | Honolulu, Hawaii, U.S. |
| Sieg | 10-0 | Mike Whitehead | TKO (knee and punches) | | Superbrawl 24: ROTH 2 | Apr 27, 2002 | 1 | 2:38 | Honolulu, Hawaii, U.S. |
| Sieg | 9-0 | Mike Whitehead | TKO (punches) | | Superbrawl 24: ROTH 1 | Apr 26, 2002 | 1 | 3:46 | Honolulu, Hawaii, U.S. |
| Sieg | 8-0 | Matt Fremmbling | Decision (unanimous) | | Extreme Challenge 47 | Mar 16, 2002 | 2 | 5:00 | Orem, Utah, U.S. |
| Sieg | 7-0 | Gino de la Cruz | TKO (punches) | | Extreme Challenge 47 | Mar 16, 2002 | 1 | 0:43 | Orem, Utah, United States |
| Sieg | 6-0 | Ernest Henderson | TKO (fell out of the ring) | | Extreme Challenge 47 | Mar 16, 2002 | 1 | 0:36 | Orem, Utah, U.S. |
| Sieg | 5-0 | Greg Wikan | Submission (choke) | | Extreme Challenge Trials | Nov 17, 2001 | 3 | 2:20 | Davenport, Iowa, U.S. |
| Sieg | 4-0 | Ben Rothwell | Decision (unanimous) | | Extreme Challenge 42 | Aug 24, 2001 | 3 | 5:00 | Davenport, Iowa, U.S. |
| Sieg | 3-0 | Greg Wikan | TKO (corner stoppage) | | UW: Ultimate Fight Minnesota | Jun 02, 2001 | 1 | 5:00 | Bloomington, Minnesota, U.S. |
| Sieg | 2-0 | Gabe Beauperthy | Submission (choke) | | GC 3: Showdown at Soboba | Apr 07, 2001 | 2 | 4:16 | Friant, California, U.S. |
| Sieg | 1-0 | Randy Durant | TKO (strikes) | | IFC: Battleground 2001 | Jan 19, 2001 | 1 | 2:05 | Atlantic City, New Jersey, U.S. |
