| Sieg | 36-4-1 | Evan Dunham  | Decision (split) |  | UFC 119 | Sep 25, 2010 | 3 | 5:00 | Indianapolis, Indiana, United States |
| Niederlage | 35-4-1 | Frankie Edgar | Decision (unanimous) |  | UFC 98 | May 23, 2009 | 3 | 5:00 | Las Vegas, Nevada, U.S. |
| Sieg | 35-3-1 | Tyson Griffin | Decision (unanimous) |  | UFC 90 | Oct 25, 2008 | 3 | 5:00 | Rosemont, Illinois, United States |
| Niederlage | 34-3-1 | B.J. Penn | TKO (flying knee & punches) | | UFC 84 | May 24, 2008 | 3 | 5:00 | Las Vegas, Nevada, US |
| Sieg | 34-2-1 | Hermes França | Decision (unanimous) | | UFC 73 | Jul 07, 2007 | 5 | 5:00 | Sacramento, California, United States |
| Sieg | 33-2-1 | Kenny Florian | Decision (unanimous) |  | UFC 64 | Oct 14, 2006 | 5 | 5:00 | Nevada, United States |
| Sieg | 32-2-1 | Nick Diaz | Decision (unanimous) |  | UFC 59 | Apr 15, 2006 | 3 | 5:00 | Anaheim, United States |
| Niederlage | 31-2-1 | Georges St. Pierre  | TKO (punches & elbows) |  | UFC 56 | Nov 19, 2005 | 2 | 2:53 | Las Vegas, United States |
| Sieg | 31-1-1 | Joel Blanton | Submission (rear naked choke) | | BP: Pride and Glory | Sep 17, 2005 | 1 | 2:02 | Georgia, United States |
| Sieg | 30-1-1 | Lee King | Submission (arm triangle choke) | | Extreme Challenge 60 | Nov 12, 2004 | 1 | 2:20 | Medina, Minnesota, United States |
| Sieg | 29-1-1 | Brodie Farber | Submission (guillotine choke) | | SF 6: Battleground in Reno | Sep 23, 2004 | 1 | 0:55 | Reno, Nevada, United States |
| Sieg | 28-1-1 | Darin Brudigan | Submission (arm triangle choke) | | Cage Fighting Xtreme 2 | Sep 04, 2004 | 1 | 1:30 | Brainerd, Minnesota, United States |
| Sieg | 27-1-1 | Gerald Strebendt | TKO (punches) | | Extreme Challenge 58 | Jun 11, 2004 | 1 | 3:52 | Medina, Minnesota, United States |
| Sieg | 26-1-1 | Eric Heinz | Submission (neck crank) | | Pride and Fury | Jun 03, 2004 | 1 | 0:58 | Worley, Idaho, United States |
| Sieg | 25-1-1 | Jake Short | Submission (rear naked choke) | | ICC: Trials 2 | Apr 30, 2004 | 1 | 2:51 | Minnesota, United States |
| Sieg | 24-1-1 | Kaleo Padilla | Submission (neck crank) | | You Think You're Tough | Apr 17, 2004 | 2 | 1:17 | Kona, Hawaii, United States |
| Sieg | 23-1-1 | Ryuki Ueyama | Decision (unanimous) | | Pride Bushido 2 | Feb 15, 2004 | 2 | 5:00 | Yokohama, Japan |
| Sieg | 22-1-1 | Charles Diaz | Submission (americana) | | EP: XXXtreme Impact | Dec 28, 2003 | 2 | 0:58 | Tijuana, Mexico |
| Sieg | 21-1-1 | Mark Long | Submission (punches) | | Extreme Combat | Dec 12, 2003 | 1 | 0:42 | Fridley, Minnesota, United States |
| Sieg | 20-1-1 | John Alexander | TKO (punches) | | Extreme Combat | Aug 02, 2003 | 1 | 1:57 | Anoka, Minnesota, United States |
| Niederlage | 19-1-1 | Matt Hughes | Decision (unanimous) | | UFC 42 | Apr 25, 2003 | 5 | 5:00 | Miami, Florida, United States |
| Sieg | 19-0-1 | John Alexander | Submission (rear naked choke) | | Extreme Combat 2 | Dec 07, 2002 | 1 | 1:28 | Minneapolis, Minnesota, United States |
| Sieg | 18-0-1 | Benji Radach | TKO (doctor stoppage) | | UFC 39 | Sep 27, 2002 | 1 | 4:16 | Uncasville, Connecticut, United States |
| Sieg | 17-0-1 | Jutaro Nakao  | Decision (unanimous) | | UFC 36 | Mar 22, 2002 | 3 | 5:00 | Las Vegas, Nevada, United States |
| Sieg | 16-0-1 | Claudionor Fontinelle | Submission (rear naked choke) | | UCC 6: Redemption | Oct 19, 2001 | 2 | 1:04 | Montreal, Quebec, Canada |
| Unentschieden | 15-0-1 | Kiuma Kunioku | Draw | | Pancrase - 2001 Neo-Blood Tournament Second Round | Jul 29, 2001 | 3 | 5:00 | Tokyo, Japan |
| Sieg | 15-0 | Curtis Brigham | TKO (retirement) | | UW: St. Paul | Jul 15, 2001 | 3 | 1:15 | St. Paul, Minnesota, United States |
| Sieg | 14-0 | Jason Purcell | TKO (punches) | | UW: Ultimate Fight Minnesota | Jun 02, 2001 | 1 | 1:42 | Bloomington, Minnesota, United States |
| Sieg | 13-0 | Marty Armendarez | TKO (punches) | | KOTC 8 - Bombs Away | Apr 29, 2001 | 3 | 2:07 | Williams, California, United States |
| Sieg | 12-0 | Manny Gamburyan  | Decision (unanimous) | | Reality Submission Fighting 3 | Mar 30, 2001 | 1 | 18:00 | Illinois, United States |
| Sieg | 11-0 | Tiki Ghosn | Submission (injury) | | UFC 30 | Feb 23, 2001 | 2 | 4:47 | Atlantic City, New Jersey, United States |
| Sieg | 10-0 | Karo Parisyan | TKO (corner stoppage) | | Reality Submission Fighting 2 | Jan 05, 2001 | 1 | 16:20 | Belleville, Illinois, United States |
| Sieg | 9-0 | Ken Parham | Decision (unanimous) | | Submission Fighting Championships | Nov 03, 2000 | 2 | 5:00 | Collinsville, Illinois, United States |
| Sieg | 8-0 | Karo Parisyan | Decision (unanimous) | | Reality Submission Fighting 1 | Oct 10, 2000 | 1 | 18:00 | Belleville, Illinois, United States |
| Sieg | 7-0 | Steve Gomm | Decision (split) | | Extreme Challenge 28 | Oct 09, 1999 | 1 | 10:00 | Ogden, Utah, United States |
| Sieg | 6-0 | Scott Bills | Decision (unanimous) | | Extreme Challenge 28 | Oct 09, 1999 | 1 | 10:00 | Ogden, Utah, United States |
| Sieg | 5-0 | Kurtis Jensen | TKO (punches) | | Extreme Challenge: Trials | Oct 04, 1999 | 1 | 1:00 | Mason City, Iowa, United States |
| Sieg | 4-0 | Johnnie Holland | Submission (americana) | | Ultimate Wrestling | Aug 13, 1999 | 2 | 2:10 | Bloomington, Minnesota, United States |
| Sieg | 3-0 | Joe Paun | Decision (unanimous) | | Midwest MMA Championship 1 | Jul 11, 1999 | 1 | 15:00 | Clinton, Iowa, United States |
| Sieg | 2-0 | Dean Kugler | Decision (unanimous) | | Midwest MMA Championship 1 | Jul 11, 1999 | 1 | 10:00 | Clinton, Iowa, United States |
| Sieg | 1-0 | Roscoe Ostyn | Decision (unanimous) | | Dangerzone: Mahnomen | Jun 19, 1999 | 3 | 3:00 | Mahnomen, Minnesota, United States |
