| Sieg | 92-22-6 | Mike Khardas | TKO (Submission to Head Kick) |  | EC - Extreme Challenge 239 | Sep 12, 2020 | 1 | 1:47 | Clinton, Iowa, United States  |
| Niederlage | 91-22-6 | Egidijus Valavicius  | Submission (Punches) |  | Sugar Creek Showdown 28: Shockwave | Nov 14, 2015 | 1 | 0:56 | Hinton, United States |
| Unentschieden | 91-21-6 | Tony Lopez | No Contest |  | SCS 25 - Apocalypse | Mar 28, 2015 | 5 | 5:00 | Hinton, United States |
| Sieg | 91-21-5 | Brian Imes | Submission (kimura) |  | SCS 22 - Reborn | Sep 13, 2014 | 1 | 1:15 | Hinton, United States |
| Sieg | 90-21-5 | Dan McGlasson | Submission (Rear-Naked Choke) |  | American Predator Fighting Championship 16 | Apr 05, 2014 | 1 | 3:45 | Villa Park, United States |
| Sieg | 89-21-5 | Brad Scholten | Submission (rear naked choke) |  | Extreme Challenge 200 | Nov 23, 2011 | 1 | 2:26 | Council Bluffs, Iowa, US |
| Sieg | 88-21-5 | Shawn Marchand | Submission (rear-naked choke) | | Elite 1 MMA: Hostile Territory | Jul 16, 2011 | 1 | 2:18 | Moncton, Canada |
| Niederlage | 87-21-5 | Thales Leites  | Decision (split) | | Superior Challenge 7 | Apr 30, 2011 | 3 | 5:00 | Stockholm, Sweden |
| Sieg | 87-20-5 | Lee McKibbin | Submission (guillotine choke) | | Cage Wars - Validation | Dec 10, 2010 | 1 | 3:40 | Belfast, Northern Ireland |
| Niederlage | 86-20-5 | Bryan Baker | Decision (unanimous) | | Bellator 30 | Sep 23, 2010 | 3 | 5:00 | Louisville, Kentucky, US |
| Sieg | 86-19-5 | Brian Warren | Submission (arm-triangle choke) | | UFO: Rumble at the Races | Jul 24, 2010 | 1 | 3:09 | Kennewick, Washington, US |
| Sieg | 85-19-5 | Sean Salmon | Submission (rear-naked choke) | | IFC: Extreme Challenge | Jul 10, 2010 | 1 | 1:57 | Mt. Pleasant, Michigan, US |
| Sieg | 84-19-5 | Victor Moreno | Submission (rear-naked choke) | | 5150 Combat League/XFL "New Year's Revolution" | Jan 16, 2010 | 1 | 2:37 | Tulsa, Oklahoma, US |
| Sieg | 83-19-5 | Joe Trujillo | Submission (keylock) | | Rocky Mountain Nationals: Stars of MMA | Oct 30, 2009 | 1 | 2:52 | Denver, Colorado, Us |
| Sieg | 82-19-5 | Jason Guida | Technical Submission | | Arena Rumble: Guida/Horn | Sep 12, 2009 | 1 | 4:03 | Spokane, United States |
| Sieg | 81-19-5 | Chris Davis | Submission (rear-naked choke) | | Adrenaline MMA 3: Bragging Rights | Jun 13, 2009 | 1 | 4:17 | Birmingham, Alabama, US |
| Niederlage | 80-19-5 | Rousimar Palhares | Decision (unanimous) |  | UFC 93 | Jan 17, 2009 | 3 | 5:00 | Dublin, Ireland |
| Niederlage | 80-18-5 | Dean Lister | Submission (guillotine choke) | | The Ultimate Fighter: Team Rampage vs Team Forrest Finale | Jun 21, 2008 | 1 | 3:52 | Las Vegas, Nevada, US |
| Niederlage | 80-17-5 | Nate Marquardt | Submission(standing guillotine choke) | | UFC 81 | Feb 02, 2008 | 2 | 1:37 | Las Vegas, United States |
| Sieg | 80-16-5 | Court McGee | Decision (unanimous) | | Ultimate Combat Experience: Utah | Dec 01, 2007 | 3 | 5:00 | Salt Lake City, Utah, US |
| Niederlage | 79-16-5 | Jorge Santiago | Submission (triangle choke) | | Art of War 3 | Sep 01, 2007 | 1 | 3:02 | Dallas, Texas, United States |
| Sieg | 79-15-5 | Falaniko Vitale | Decision (split) | | International Fight League: Oakland | Jan 19, 2007 | 5 | 4:00 | Oakland, California, US |
| Niederlage | 78-15-5 | Matt Lindland | TKO (punches) |  | International Fight League: Portland | Sep 09, 2006 | 2 | 0:21 | Portland, United States |
| Sieg | 78-14-5 | Chael Sonnen | Submission (armbar) | | UFC 60 | May 27, 2006 | 2 | 1:17 | Los Angeles, United States |
| Sieg | 77-14-5 | Trevor Prangley  | Decision (unanimous) | | UFC 56 | Nov 19, 2005 | 3 | 5:00 | Las Vegas, Nevada, US |
| Niederlage | 76-14-5 | Chuck Liddell | Submission |  | UFC 54 | Aug 20, 2005 | 4 | 2:46 | Las Vegas, United States |
| Sieg | 76-13-5 | Spencer Canup | KO (punches) | | IFC: Caged Combat | May 21, 2005 | 1 | 3:36 | Columbus, Ohio, United States |
| Sieg | 75-13-5 | Josh Burkman | Techn.subm. (guillotine choke) | | XFC: Dome of Destruction 1 | Apr 29, 2005 | 1 | 1:14 | Tacoma, Washington, US |
| Sieg | 74-13-5 | William Hill | Submission (guillotine choke) | | Extreme Challenge 61 | Apr 22, 2005 | 2 | 2:45 | Osceola, Iowa, United States |
| Sieg | 73-13-5 | Kazuki Okubo | KO (punch to the body) | | Euphoria: USA vs World | Feb 26, 2005 | 1 | 3:19 | Atlantic City, New Jersey, US |
| Sieg | 72-13-5 | Chael Sonnen | Submission (guillotine choke) | | SF 6: Battleground in Reno | Sep 23, 2004 | 2 | 2:35 | Reno, Nevada, United States |
| Sieg | 71-13-5 | Kyle Seals | TKO (knee) | | Alaska Fighting Championship | Jul 14, 2004 | 1 | N/A | Anchorage, Alaska, US |
| Niederlage | 70-13-5 | Anderson Silva | Decision (unanimous) | | Gladiator FC: Day 2 | Jun 27, 2004 | 3 | 5:00 | Seoul, South Korea |
| Sieg | 70-12-5 | Cameron Brown | Submission (arm-triangle choke) | | PXC 2: Chaos | May 22, 2004 | 1 | 3:05 | Guam |
| Sieg | 69-12-5 | Chael Sonnen | TKO (cut) | | Extreme Challenge 57 | May 06, 2004 | 1 | 3:34 | Council Bluffs, United States |
| Sieg | 68-12-5 | David Loiseau | Submission (guillotine choke) | | TKO Major League MMA | Feb 28, 2004 | 1 | 0:54 | Montreal, Quebec, Canada |
| Sieg | 67-12-5 | Ron Fields | TKO (punches) | | ICE 7: Meltdown at Metropolis | Jan 16, 2004 | 2 | 3:01 | Fairfield, Ohio, United States |
| Sieg | 66-12-5 | Dean Lister | Decision (majority) | | King of the Cage 31 | Dec 06, 2003 | 4 | 5:00 | San Diego, California, US |
| Unentschieden | 65-12-5 | James Zikic  | Draw | | Extreme Brawl 4 | Sep 28, 2003 | 3 | 5:00 | Bracknell, England, England  |
| Niederlage | 65-12-4 | Renato Sobral | Decision (unanimous) | | International Fighting Championships | Sep 06, 2003 | 3 | 5:00 | Denver, Colorado, U.S. |
| Sieg | 65-11-4 | Forrest Griffin | KO (head kick) | | IFC: Global Domination | Sep 06, 2003 | 2 | 3:40 | Denver, United States |
| Sieg | 64-11-4 | Mikhail Avetisyan | Submission (armbar) | | IFC: Global Domination | Sep 06, 2003 | 1 | 4:59 | Denver, Colorado, US |
| Sieg | 63-11-4 | William Hill | Submission (rear-naked choke) | | Extreme Challenge 51 | Aug 02, 2003 | 1 | 4:47 | St. Charles, Illinois, US |
| Sieg | 62-11-4 | Vernon White | Decision (unanimous) | | King of the Cage 23: Sin City | May 16, 2003 | 5 | 5:00 | Las Vegas, Nevada, U.S. |
| Sieg | 61-11-4 | Homer Moore | Decision (unanimous) | | ICC 2: Rebellion | Apr 18, 2003 | 3 | 5:00 | Minneapolis, Minnesota, US |
| Sieg | 60-11-4 | Chalid Arrab  | Decision (unanimous) | | 2H2H 6: Simply the Best | Mar 16, 2003 | 1 | 15:00 | Rotterdam, the Netherlands |
| Sieg | 59-11-4 | Travis Fulton | TKO (corner stoppage) | | ICC 1: Retribution | Jan 12, 2003 | 2 | 0:50 | Minnesota, United States |
| Sieg | 58-11-4 | Kristof Midoux | Submission (arm-triangle choke) | | UCC 11: The Next Level | Oct 11, 2002 | 2 | 1:02 | Montreal, Quebec, Canada |
| Sieg | 57-11-4 | Aaron Brink | Submission (rear-naked choke) | | WEC 4 | Aug 31, 2002 | 1 | 0:54 | Uncasville, Connecticut, US |
| Sieg | 56-11-4 | Gilbert Yvel  | Decision (unanimous) | | Pride 21 | Jun 23, 2002 | 3 | 5:00 | Saitama Super Arena, Japan  |
| Sieg | 55-11-4 | Steve Funn | Submission (armbar) | | Ultimate Cage Fighting 1 | May 09, 2002 | 1 | 0:13 | Los Angeles, California, US |
| Sieg | 54-11-4 | Greg Wikan | Submission (rear-naked choke) | | UW: Horn vs. Wikan | Mar 02, 2002 | 2 | 4:40 | Minnesota, United States |
| Sieg | 53-11-4 | Stephan Potvin | KO (slam) | | UCC 7: Bad Boyz | Jan 25, 2002 | 1 | 0:35 | Montreal, Quebec, Canada |
| Sieg | 52-11-4 | Akira Shoji | Decision (unanimous) | | Pride 18 | Dec 23, 2001 | 3 | 5:00 | Fukuoka, Fukuoka |
| Sieg | 51-11-4 | Dan Theodore | KO (knee) | | Ultimate Wrestling Minnesota | Oct 28, 2001 | 2 | 1:41 | Minnesota, United States |
| Niederlage | 50-11-4 | Ricardo Arona | Decision (majority) | | Rings: 10th Anniversary | Aug 11, 2001 | 2 | 5:00 | Tokyo, Japan |
| Sieg | 50-10-4 | Shawn Wagner | Submission (rear-naked choke) | | Mass Destruction 3 | Aug 04, 2001 | 1 | 2:35 | Springfield, United States |
| Sieg | 49-10-4 | Demetrius Worlds | Submission (rear-naked choke) | | Gladiators 16 | Jun 30, 2001 | 1 | N/A | Des Moines, Iowa, US |
| Sieg | 48-10-4 | Brad Krane | Submission (punches) | | Gladiators 14 | May 11, 2001 | 1 | N/A | Omaha, Nebraska, US |
| Sieg | 47-10-4 | Iouri Bekichev | Submission (arm-triangle choke) | | Rings: World Title Series 1 | Apr 20, 2001 | 1 | 0:50 | Tokyo, Japan |
| Sieg | 46-10-4 | Griffen Reynaud | Submission (punches) | | Rings USA: Battle of Champions | Mar 17, 2001 | 1 | 2:55 | Council Bluffs, Iowa, US |
| Niederlage | 45-10-4 | Elvis Sinosic | Submission (armbar) | | UFC 30 | Feb 23, 2001 | 1 | 2:59 | Atlantic City, New Jersey, US |
| Niederlage | 45-9-4 | Randy Couture | Decision (unanimous) | | Rings: King of Kings 2000 | Oct 09, 2000 | 3 | 5:00 | Tokyo, Japan |
| Sieg | 45-8-4 | Chris Haseman | Submission (armbar) | | Rings USA: Rising Stars Final | Sep 30, 2000 | 1 | 2:36 | Moline, Illinois, United States |
| Sieg | 44-8-4 | Josh Hall | Submission (kneebar) | | Rings USA: Rising Stars Final | Sep 30, 2000 | 1 | 3:50 | Moline, Illinois, United States |
| Sieg | 43-8-4 | Eugene Jackson | Submission (armbar) | | UFC 27 | Sep 22, 2000 | 1 | 4:32 | New Orleans, Louisiana, US |
| Niederlage | 42-8-4 | Ricardo Arona | Decision (split) | | Rings: Millennium Combine 3 2000 | Aug 23, 2000 | 2 | 5:00 | Osaka, Japan |
| Sieg | 42-7-4 | Keith Mielke | KO (punches) | | Rings USA: Rising Stars Block A | Jul 15, 2000 | 1 | 1:47 | Orem, Utah, United States |
| Sieg | 41-7-4 | Jason Allar | KO (head kick) | | Extreme Challenge 35 | Jun 29, 2000 | 2 | 1:03 | Davenport, Iowa, United States |
| Sieg | 40-7-4 | Nate Parmelee | KO (elbow) | | Extreme Challenge 33 | Jun 10, 2000 | 1 | 3:24 | Council Bluffs, Iowa, US |
| Niederlage | 39-7-4 | Kiyoshi Tamura | Decision (unanimous) | | Colosseum 2000 | May 26, 2000 | 2 | 5:00 | Japan |
| Sieg | 39-6-4 | Yoshihisa Yamamoto | Submission (arm-triangle choke) | | Rings: Millennium Combine 1 | Apr 20, 2000 | 2 | 2:50 | Tokyo, Japan |
| Sieg | 38-6-4 | George Randolph | Submission (arm-triangle choke) | | SFC: Xplosion! | Jan 28, 2000 | 1 | 3:32 | Belleville, Illinois, United States |
| Niederlage | 37-6-4 | Antonio Rodrigo Nogueira | Decision (unanimous) | | WEF 8: Goin' Platinum | Jan 15, 2000 | 3 | 8:00 | Rome, Georgia, United States |
| Sieg | 37-5-4 | Aaron Pendleton | Submission (punches) | | Extreme Challenge 30 | Dec 01, 1999 | 1 | 3:25 | Council Bluffs, Iowa, US |
| Sieg | 36-5-4 | John Marsh | Decision (unanimous) | | Neutral Grounds 13 | Nov 20, 1999 | 3 | 5:00 | Lakeside, California, US |
| Sieg | 35-5-4 | Johnathan Ivey | TKO (injury) | | HOOKnSHOOT: Millennium | Nov 06, 1999 | 1 | 1:24 | Evansville, Indiana, US |
| Niederlage | 34-5-4 | Hiromitsu Kanehara | Decision (majority) | | Rings: King of Kings 1999 Block A | Oct 28, 1999 | 2 | 5:00 | Tokyo, Japan |
| Sieg | 34-4-4 | Jason Godsey | Submission (armbar) | | UFC 22 | Sep 24, 1999 | 1 | 2:08 | Lake Charles, Louisiana, US |
| Sieg | 33-4-4 | Adam Harris | TKO (punches) | | Extreme Challenge 27 | Aug 21, 1999 | 1 | 2:31 | Davenport, Iowa, United States |
| Sieg | 32-4-4 | Daiju Takase | TKO (punches) | | UFC 21 | Jul 16, 1999 | 1 | 4:41 | Cedar Rapids, Iowa, US |
| Sieg | 31-4-4 | Scott Ventimiglia | Submission (armbar) | | HOOKnSHOOT: Ultimate Wrestle! | Jun 12, 1999 | 1 | N/A | Evansville, Indiana, US |
| Sieg | 30-4-4 | Kristian Rothaermel | Submission (rear-naked choke) | | Extreme Challenge 25 | Jun 11, 1999 | 1 | 2:31 | Council Bluffs, Iowa, US |
| Sieg | 29-4-4 | Justin Ellison | Submission (palm strikes) | | Extreme Challenge 24 | May 15, 1999 | 1 | 2:30 | Salt Lake City, Utah, US |
| Sieg | 28-4-4 | Jim Theobald | Submission (rear-naked choke) | | Submission Fighting Championships | Apr 30, 1999 | 1 | N/A | O'Fallon, Illinois, United States |
| Sieg | 27-4-4 | Mike Delaney | Submission (punches) | | Freestyle Combat Challenge 1 | Apr 19, 1999 | 1 | 8:05 | Racine, Wisconsin, US |
| Sieg | 26-4-4 | Todd Butler | Submission (armbar) | | IFC: Fighters Revenge | Apr 02, 1999 | 1 | 2:22 | Kahnawake, Quebec, Canada |
| Sieg | 25-4-4 | Jammy Daniels | Submission (punches) | | Extreme Boxing 3 | Mar 23, 1999 | 1 | 2:47 | Davenport, Iowa, United States |
| Sieg | 24-4-4 | Brandon Wilson | Submission (rear-naked choke) | | Gladiators 2 | Mar 18, 1999 | 1 | 1:40 | Sioux City, Iowa, United States |
| Sieg | 23-4-4 | Chuck Liddell | Technical submission | | UFC 19 | Mar 05, 1999 | 1 | 12:00 | Bay St. Louis, United States |
| Sieg | 22-4-4 | Steve Berger | Decision (unanimous) | | Submission Fighting Championships | Jan 31, 1999 | 1 | 24:00 | Belleville, Illinois, United States |
| Sieg | 21-4-4 | Ken Parr | Submission (rear-naked choke) | | HOOKnSHOOT: Trial | Jan 30, 1999 | 1 | 3:23 | Evansville, Indiana, US |
| Sieg | 20-4-4 | Mark Walker | Submission (arm-triangle choke) | | Extreme Boxing 1 | Jan 20, 1999 | 1 | 2:29 | Davenport, Iowa, United States |
| Sieg | 19-4-4 | John Dixon | Submission (armbar) | | IFC: Extreme Combat | Jan 09, 1999 | 1 | 0:57 | Montreal, Quebec, Canada |
| Sieg | 18-4-4 | Rene Tremblay | Submission (triangle choke) | | IFC: Extreme Combat | Jan 09, 1999 | 1 | 1:01 | Montreal, Quebec, Canada |
| Sieg | 17-4-4 | Nick Starks | Submission (arm-triangle choke) | | New Year's Eve Knockout 1 | Dec 31, 1998 | 1 | 5:21 | Atlanta, Georgia, United States |
| Unentschieden | 16-4-4 | Keiichiro Yamamiya | Draw | | Pancrase: Advance 12 | Dec 19, 1998 | 1 | 15:00 | Chiba, Chiba |
| Sieg | 16-4-3 | Rich Nettleton | Submission (rear-naked choke) | | Gladiators 1 | Nov 13, 1998 | 1 | 1:44 | Sioux City, Iowa, United States |
| Sieg | 15-4-3 | Jerome Smith | Submission (armbar) | | HOOKnSHOOT: Eruption | Nov 07, 1998 | 1 | 4:02 | Evansville, Indiana, US |
| Sieg | 14-4-3 | Derrick Ruffin | Submission (rear-naked choke) | | Submission Fighting Championships | Nov 06, 1998 | 1 | 3:49 | Carbondale, Illinois, US |
| Niederlage | 13-4-3 | Ebenezer Fontes Braga | Submission (guillotine choke) | | UFC Brazil | Oct 16, 1998 | 1 | 3:27 | Sao Paulo, Brazil |
| Sieg | 13-3-3 | Wayne Pittman | Submission (rear-naked choke) | | Midwest Fighting 2 | Sep 28, 1998 | 1 | 1 | United States |
| Sieg | 12-3-3 | Clayton Miller | TKO (punches) | | Midwest Fighting 2 | Sep 28, 1998 | 1 | 3:27 | United States, United States |
| Sieg | 11-3-3 | Todd Butler | Submission (rear-naked choke) | | Extreme Challenge 20 | Aug 22, 1998 | 1 | 3:28 | Davenport, Iowa, United States |
| Sieg | 10-3-3 | Jaymon Hotz | Submission (punches) | | Midwest Fighting 1 | Jul 28, 1998 | 1 | 1:56 | Broomfield, Colorado, US |
| Niederlage | 9-3-3 | Frank Shamrock | Submission (kneebar) |  | UFC 17 | May 15, 1998 | 1 | 16:28 | Mobile, Alabama, United States |
| Unentschieden | 9-2-3 | Travis Fulton | Draw | | Extreme Challenge 16 | Mar 26, 1998 | 1 | 20:00 | Iowa, United States |
| Sieg | 9-2-2 | Noe Hernandez | Decision (unanimous) | | Extreme Challenge 15 | Feb 27, 1998 | 1 | 15:00 | Muncie, Indiana, United States |
| Sieg | 8-2-2 | Pat Assalone | Submission (armbar) | | Extreme Challenge 15 | Feb 27, 1998 | 1 | 1:38 | Muncie, Indiana, United States |
| Unentschieden | 7-2-2 | Travis Fulton | Draw | | Extreme Challenge 9 | Aug 30, 1997 | 1 | 15:00 | Davenport, United States |
| Unentschieden | 7-2-1 | Dan Severn | Draw | | Extreme Challenge 7 | Jun 25, 1997 | 1 | 20:00 | Council Bluffs, Iowa, US |
| Niederlage | 7-2 | Jason Godsey | Submission (rear-naked choke) | | Extreme Challenge 6 | May 10, 1997 | 1 | 6:42 | Battle Creek, Michigan, US |
| Sieg | 7-1 | Steven Goss | Submission (triangle choke) | | Extreme Challenge 6 | May 10, 1997 | 1 | 4:16 | Battle Creek, Michigan, US |
| Sieg | 6-1 | Dennis Reed | Submission (armbar) | | Extreme Challenge 4 | Feb 22, 1997 | 1 | 7:55 | Council Bluffs, Iowa, US |
| Sieg | 5-1 | Gary Myers | Submission (armbar) | | Extreme Challenge 1 | Nov 23, 1996 | 1 | 2:06 | Des Moines, Iowa, US |
| Sieg | 4-1 | Nate Schroeder | Submission (rear-naked choke) | | Brawl at the Ballpark 1 | Sep 01, 1996 | 1 | 4:50 | Davenport, Iowa, United States |
| Sieg | 3-1 | Nate Schroeder | Submission (punches) | | Gladiators 1 | Jul 26, 1996 | 1 | 7:44 | Davenport, Iowa, United States |
| Niederlage | 2-1 | Mark Hanssen | Submission (armbar) | | Quad City Ultimate 2 | May 11, 1996 | 1 | 9:10 | Moline, Illinois, United States |
| Sieg | 2-0 | Mike Adsit | Submission (strikes) | | Quad City Ultimate 2 | May 11, 1996 | 1 | 2:00 | Moline, Illinois, United States |
| Sieg | 1-0 | Rick Graveson | Submission (armbar) | | Atlanta Fights | Mar 01, 1996 | 1 | 1:54 | Atlanta, Georgia, United States |
