| Sieg | 19-7 | Tito Ortiz  | Decision (unanimous) | | UFC 148: Silva vs Sonnen 2 | Jul 07, 2012 | 3 | 5:00 | Las Vegas, United States |
| Niederlage | 18-7 | Mauricio Rua  | KO (punches) |  | UFC 134 | Aug 27, 2011 | 1 | 1:53 | Rio de Janeiro, Brazil |
| Sieg | 18-6 | Rich Franklin | Decision (unanimous) |  | UFC 126 | Feb 05, 2011 | 3 | 5:00 | Las Vegas, United States |
| Sieg | 17-6 | Tito Ortiz | Decision (split) |  | UFC 106 | Nov 21, 2009 | 3 | 5:00 | Las Vegas, United States |
| Niederlage | 16-6 | Anderson Silva | KO (punch) |  | UFC 101 | Aug 08, 2009 | 1 | 3:23 | Philadelphia, United States |
| Niederlage | 16-5 | Rashad Evans | TKO (punches) |  | UFC 92 | Dec 27, 2008 | 3 | 2:46 | Las Vegas, United States |
| Sieg | 16-4 | Quinton Jackson | Decision (unanimous) |  | UFC 86 | Jul 05, 2008 | 5 | 5:00 | Las Vegas, United States |
| Sieg | 15-4 | Mauricio Rua | Submission (rear-naked choke) | | UFC 76 | Sep 22, 2007 | 3 | 4:45 | Anaheim, California, U.S. |
| Sieg | 14-4 | Hector Ramirez | Decision (unanimous) | | UFC 72 | Jun 16, 2007 | 3 | 5:00 | Belfast, Northern Ireland |
| Niederlage | 13-4 | Keith Jardine | TKO (punches) |  | UFC 66 | Dec 30, 2006 | 1 | 4:41 | Las Vegas, United States |
| Sieg | 13-3 | Stephan Bonnar | Decision (unanimous) |  | UFC 62 | Aug 26, 2006 | 3 | 5:00 | Las Vegas, United States |
| Niederlage | 12-3 | Tito Ortiz | Decision (split) | | UFC 59 | Apr 15, 2006 | 3 | 5:00 | Anaheim, United States |
| Sieg | 12-2 | Elvis Sinosic | TKO (punches) |  | UFC 55 | Oct 07, 2005 | 1 | 3:30 | Uncasville, United States |
| Sieg | 11-2 | Bill Mahood | Submission (rear-naked choke) | | UFC 53 | Jun 04, 2005 | 1 | 2:18 | Atlantic City, United States |
| Sieg | 10-2 | Stephan Bonnar | Decision (unanimous) | | The Ultimate Fighter 1 Finale | Apr 09, 2005 | 3 | 5:00 | Las Vegas, United States |
| Sieg | 9-2 | Edson Silva | KO (punch) | | Heat FC 2: Evolution | Dec 18, 2003 | 1 | 1:04 | Rio Grande do Norte, Brazil |
| Niederlage | 8-2 | Jeremy Horn | KO (head kick) | | IFC: Global Domination | Sep 06, 2003 | 2 | 3:40 | Denver, United States |
| Sieg | 8-1 | Chael Sonnen | Submission (triangle choke) | | IFC: Global Domination | Sep 06, 2003 | 1 | 2:25 | Denver, United States |
| Sieg | 7-1 | Ebenezer Fontes Braga | Submission (rear-naked choke) | | Heat FC 1: Genesis | Jul 31, 2003 | 1 | N/A | Natal, Rio Grande do Norte, Brazil |
| Sieg | 6-1 | Steve Sayegh | Submission (punches) | | King of the Cage 20: Crossroads | Dec 15, 2002 | 1 | 1:45 | Bernalillo, United States |
| Sieg | 5-1 | Travis Fulton | TKO (doctor stoppage) | | CC 1: Halloween Heat | Oct 26, 2002 | 1 | 5:00 | Atlanta, Georgia, United States |
| Sieg | 4-1 | Jeff Monson  | Decision (unanimous) | | WEFC 1: Bring It On | Jun 29, 2002 | 4 | 4:20 | Marietta, United States |
| Sieg | 3-1 | Kent Hensley | Submission (triangle choke) | | ISCF: Battle at the Brewery | Apr 12, 2002 | 1 | 2:26 | Atlanta, Georgia, United States |
| Sieg | 2-1 | Jason Braswell | Decision (split) | | RSF 7: Animal Instinct | Jan 26, 2002 | 3 | 4:00 | Lakeland, Florida, United States |
| Sieg | 1-1 | Wiehan Lesh | Submission (rear-naked choke) | | Pride and Honor | Nov 24, 2001 | 1 | N/A | South Africa |
| Niederlage | 0-1 | Dan Severn | Decision (unanimous) | | RSF 5: New Blood Conflict | Oct 27, 2001 | 3 | 4:00 | Augusta, United States |
