| Sieg | 29-7-2 | Thomas Denny | KO (punches) | | IFL 11 | Dec 11, 2008 | 2 | 0:50 | Illinois, United States |
| Niederlage | 28-7-2 | Renzo Gracie  | Submission (Guillotine Choke) | | IFL 9 | Sep 23, 2006 | 1 | 3:37 | Illinois, United States |
| Niederlage | 28-6-2 | Matt Lindland  | TKO (punches) | | UFC 36 | Mar 22, 2002 | 1 | 3:09 | Las Vegas, United States |
| Sieg | 28-5-2 | Shonie Carter | KO (head kick) | | UFC 32 | Jun 29, 2001 | 2 | 2:42 | New Jersey, United States |
| Niederlage | 27-5-2 | Carlos Newton | Submission (bulldog choke) | | UFC 31 | May 04, 2001 | 3 | 2:50 | New Jersey, United States |
| Sieg | 27-4-2 | Kenichi Yamamoto | Submission (Guillotine Choke) | | UFC 29 | Dec 16, 2000 | 2 | 1:58 | Tokyo, Japan |
| Niederlage | 26-4-2 | Kiyoshi Tamura  | Decision (majority) | | Rings: Millennium Combine 3 | Aug 23, 2000 | 2 | 5:00 | Osaka, Japan |
| Sieg | 26-3-2 | John Alessio | Submission (armbar) | | UFC 26 | Jun 09, 2000 | 2 | 1:43 | Iowa, United States |
| Niederlage | 25-3-2 | José Landi-Jons | TKO (corner stoppage) | | WEF 8 - Goin' Platinum | Jan 15, 2000 | 1 | 8:00 | Georgia, United States |
| Sieg | 25-2-2 | Shonie Carter | Decision (unanimous) | | Extreme Challenge 27 | Aug 21, 1999 | 1 | 20:00 | Iowa, United States |
| Sieg | 24-2-2 | André Pederneiras | TKO (doctor stoppage) | | UFC 21 | Jul 16, 1999 | 2 | 2:20 | Iowa, United States |
| Sieg | 23-2-2 | Clayton Miller | Submission (triangle choke) | | Cage Combat 2 | May 30, 1999 | 1 | 0:40 | Iowa, United States |
| Niederlage | 22-2-2 | Jutaro Nakao | Submission (triangle choke) | | SuperBrawl 11 | Feb 02, 1999 | 1 | 9:22 | Hawaii, United States |
| Sieg | 22-1-2 | Jorge Patino | Decision (unanimous) | | UFC 18 | Jan 08, 1999 | 1 | 21:00 | Louisiana, United States |
| Sieg | 21-1-2 | Mikey Burnett | Decision (split) | | UFC 17.5 | Oct 16, 1998 | 1 | 21:00 | Sao Paulo, Brazil |
| Unentschieden | 20-1-2 | Dan Severn | Draw | | Extreme Challenge 20 | Aug 22, 1998 | 1 | 20:00 | Davenport, Iowa, United States |
| Sieg | 20-1-1 | Al Buck Jr. | Submission (choke) | | Midwest Shootfighting 1 | Jun 27, 1998 | 2 | 2:49 | Iowa, United States |
| Sieg | 19-1-1 | Chris Brennan | Submission (shoulder choke) | | UFC 16 | Mar 13, 1998 | 1 | 9:02 | Louisiana, United States |
| Sieg | 18-1-1 | Townsend Saunders | Decision (split) | | UFC 16 | Mar 13, 1998 | 1 | 15:00 | Louisiana, United States |
| Sieg | 17-1-1 | Chris Brennan | Decision (unanimous) | | EC - Extreme Challenge Trials | Nov 15, 1997 | 1 | 10:00 | Iowa, United States |
| Unentschieden | 16-1-1 | Chris Brennan | Draw (majority) | | Extreme Challenge 9 | Aug 30, 1997 | 1 | 20:00 | Iowa, United States |
| Sieg | 16-1 | Chuck Kim | Submission (rear-naked choke) | | Extreme Challenge 7 | Jun 25, 1997 | 1 | 10:46 | Iowa, United States |
| Niederlage | 15-1 | Matt Hume | TKO (doctor stoppage) | | Extreme Fighting 4 | Mar 28, 1997 | 1 | 5:00 | Iowa, United States |
| Sieg | 15-0 | Chad Cox | Submission (punch) | | Extreme Challenge 3 | Feb 15, 1997 | 1 | 1:84 | Iowa, United States |
| Sieg | 14-0 | Paul Kimbrel | Submission (armbar) | | Extreme Challenge 2 | Feb 01, 1997 | 1 | 5:13 | Iowa, United States |
| Sieg | 13-0 | Jason Nicholson | Decision (unanimous) | | SuperBrawl 3 | Jan 17, 1997 | 1 | 15:00 | Hawaii, United States |
| Sieg | 12-0 | Earl Loucks | Submission (americana) | | Extreme Challenge 1 | Nov 23, 1996 | 1 | 7:00 | Iowa, United States |
| Sieg | 11-0 | Pat Assalone | Submission (armbar) | | Brawl at the Ballpark 1 | Sep 01, 1996 | 1 | 4:01 | Iowa, United States |
| Sieg | 10-0 | Matt Andersen | Submission (punches) | | Gladiators 1 | Jul 26, 1996 | 1 | 5:21 | Iowa, United States |
| Sieg | 9-0 | Yasunori Matsumoto | TKO (doctor stoppage) | | QCU 2 | May 11, 1996 | 1 | 15:53 | Illinois, United States |
| Sieg | 8-0 | Andrey Dudko | Submission (rear-naked choke) | | BOTM 2 | Feb 10, 1996 | 1 | 2:49 | Illinois, United States |
| Sieg | 7-0 | Bob Gholson | KO (punches) | | BOTM 2 | Feb 10, 1996 | 1 | 2:20 | Illinois, United States |
| Sieg | 6-0 | Rick Graveson | Submission (rear-naked choke) | | BOTM 2 | Feb 10, 1996 | 1 | 0:46 | Illinois, United States |
| Sieg | 5-0 | Rick Graveson | Submission (rear-naked choke) | | QCU 1 | Jan 20, 1996 | 1 | 1:53 | Illinois, United States |
| Sieg | 4-0 | Ed McLennan | Submission (armbar) | | QCU 1 | Jan 20, 1996 | 1 | 1:28 | Illinois, United States |
| Sieg | 3-0 | Kevin Marino | Submission (rear-naked choke) | | BOTM 1 | Oct 28, 1995 | 1 | 3:49 | Illinois, United States |
| Sieg | 2-0 | Angelo Rivera | Submission (rear-naked choke) | | BOTM 1 | Oct 28, 1995 | 1 | 1:40 | Illinois, United States |
| Sieg | 1-0 | Yasunori Matsumoto | Submission (rear-naked choke) | | BOTM 1 | Oct 28, 1995 | 1 | 7:40 | Illinois, United States |
