| Sieg | 16-6-2 | Mark Smith | Submission (arm-triangle choke) | | BTBB - Born to be Bad | Nov 29, 2008 | 2 | 2:16 | Colorado, United States |
| Niederlage | 15-6-2 | Dave Herman  | TKO (punches) | | EliteXC: Return of the King | Jun 14, 2008 | 1 | 2:19 | Honolulu, Hawaii, United States |
| Sieg | 15-5-2 | Analu Brash | Submission (americana) | | X-1 Events - Champions | Jan 26, 2008 | 2 | 2:10 | Hawaii, United States |
| Sieg | 14-5-2 | Mario Rinaldi | TKO (punches) | | AOW - Art of War 3 | Sep 01, 2007 | 1 | 4:39 | Texas, United States |
| Niederlage | 13-5-2 | Roger Gracie  | Submission (armbar) |  | Bodog Fight: USA vs Russia | Dec 02, 2006 | 1 | 3:38 | Vancouver, Canada |
| Niederlage | 13-4-2 | Ricco Rodriguez | TKO (doctor stoppage) | | WFA: King of the Streets | Jul 22, 2006 | 1 | 5:00 | Los Angeles, United States |
| Sieg | 13-3-2 | Ricco Rodriguez | Decision (unanimous) | | WEC 16 | Aug 18, 2005 | 3 | 5:00 | Lemoore, United States |
| Niederlage | 12-3-2 | Tsuyoshi Kohsaka  | Decision (unanimous) | | Pancrase: Brave 10 | Nov 07, 2004 | 3 | 5:00 | Urayasu, Japan |
| Sieg | 12-2-2 | Kevin Randleman | Submission (keylock) | | Pride Final Conflict 2004 | Aug 15, 2004 | 1 | 7:44 | Saitama, Japan |
| Sieg | 11-2-2 | Keigo Takamori | Submission (americana) | | Pancrase: Brave 5 | May 28, 2004 | 1 | 1:36 | Tokyo, Japan |
| Niederlage | 10-2-2 | Mirko Filipović  | TKO (soccer kicks) | | Pride 27 | Feb 01, 2004 | 1 | 4:37 | Osaka, Osaka, Japan |
| Unentschieden | 10-1-2 | Jimmy Ambriz | Draw | | Pancrase: Hybrid 10 | Nov 30, 2003 | 3 | 5:00 | Tokyo, Japan |
| Sieg | 10-1-1 | Jun Ishii | Submission (neck crank) | | Pancrase - Hybrid 9 | Oct 31, 2003 | 1 | 1:02 | Tokyo, Japan |
| Sieg | 9-1-1 | Jerry Vrbanovic | Submission (shoulder lock) | | IFC - Global Domination | Sep 06, 2003 | 3 | - | Colrado, United States |
| Sieg | 8-1-1 | James Nevarez | TKO (punches) | | WEC 7: This Time It's Personal | Aug 09, 2003 | 3 | 2:31 | California, United States |
| Sieg | 7-1-1 | Valentijn Overeem  | Submission (keylock) | | Pride 24 | Dec 23, 2002 | 1 | 2:18 | Japan |
| Sieg | 6-1-1 | Kengo Watanabe | Submission (americana) | | Pancrase - 2002 Anniversary Show | Sep 29, 2002 | 1 | 2:33 | Yokohama, Japan |
| Sieg | 5-1-1 | Satoshi Honma | Decision (unanimous) | | UFC 25 | Apr 14, 2000 | 3 | 5:00 | Tokyo, Japan |
| Unentschieden | 4-1-1 | Tim Lajcik | Draw | | UFC 22 | Sep 24, 1999 | 3 | 5:00 | Louisiana, United States |
| Niederlage | 4-1 | Andre Roberts | KO (punches) | | UFC 21 | Jul 16, 1999 | 1 | 2:51 | Iowa, United States |
| Sieg | 4-0 | Chris Condo | TKO (punches) | | UFC 20 | May 07, 1999 | 1 | 0:28 | Alabama, United States |
| Sieg | 3-0 | Joshua Jenkins | TKO (doctor stoppage) | | BRI 1 - Bas Rutten Invitational 1 | Feb 06, 1999 | 1 | 1:14 | United States |
| Sieg | 2-0 | Daniel James | TKO (punches) | | BRI 1 - Bas Rutten Invitational 1 | Feb 06, 1999 | 1 | 0:20 | United States |
| Sieg | 1-0 | Matt Asher | TKO (punches) | | BRI 1 - Bas Rutten Invitational 1 | Feb 06, 1999 | 1 | 0:28 | United States |
