| Niederlage | 12-2 | Junior dos Santos  | Decision (unanimous) |  | UFC 131 | Jun 11, 2011 | 3 | 5:00 | Vancouver, Canada |
| Niederlage | 12-1 | Brock Lesnar  | Submission (arm triangle choke) | | UFC 116 | Jul 03, 2010 | 2 | 2:19 | Las Vegas, United States |
| Sieg | 12-0 | Frank Mir | KO (punches) | | UFC 111 | Mar 27, 2010 | 1 | 3:48 | Newark, United States |
| Sieg | 11-0 | Gabriel Gonzaga | KO (punches) | | UFC 96 | Mar 07, 2009 | 1 | 1:09 | Columbus, United States |
| Sieg | 10-0 | Neil Wain | TKO (punches) | | UFC 89 | Oct 18, 2008 | 1 | 1:31 | Birmingham, England |
| Sieg | 9-0 | Christian Wellisch | KO (punch) | | UFC 84 | May 24, 2008 | 1 | 0:44 | Las Vegas, United States |
| Sieg | 8-0 | Sherman Pendergarst | TKO (punches) | | ROF 31: Undisputed | Dec 01, 2007 | 1 | 1:41 | Colorado, United States |
| Sieg | 7-0 | Rex Richards | Submission (guillotine choke) | | Art of War 4 | Oct 27, 2007 | 1 | 1:24 | Mississippi, United States |
| Sieg | 6-0 | Rick Slaton | KO (punch) | | ROF 30: Domination | Sep 15, 2007 | 1 | 0:49 | Colorado, United States |
| Sieg | 5-0 | Chris Guillen | Submission (rear naked choke) | | Ultimate Texas Showdown 6 | Jun 24, 2006 | 1 | 0:29 | Texas, United States |
| Sieg | 4-0 | Justice Smith | TKO (punches) | | Extreme Wars 3: Bay Area Brawl | Jun 03, 2006 | 1 | 0:31 | California, United States |
| Sieg | 3-0 | Jay McCown | Submission (rear naked choke) | | Ultimate Texas Showdown 5 | Apr 29, 2006 | 1 | 1:31 | Texas, United States |
| Sieg | 2-0 | Casey Jackson | Submission (guillotine choke) | | Extreme Wars 2: X-1 | Mar 18, 2006 | 1 | 0:22 | Honolulu, Hawaii, United States |
| Sieg | 1-0 | Carlton Jones | Submission (punches) | | WEC 17 | Oct 14, 2005 | 1 | 2:11 | California, United States |
