| Sieg | 19-13 | Roy Nelson  | Decision (Unanimous) |  | Bellator 231: Mir vs Nelson 2 | Oct 25, 2019 | 3 | 5:00 | Uncasville, Connecticut, United States |
| Niederlage | 18-13 | Javy Ayala | TKO (Submission to Punches) |  | Bellator 212: Primus vs Chandler 2 | Dec 14, 2018 | 2 | 4:30 | Honolulu, Hawaii, United States |
| Niederlage | 18-12 | Fedor Emelianenko  | TKO (punches) |  | Bellator Heavyweight World Grand Prix Tournament | Apr 28, 2018 | 1 | 0:47 | Rosemont, Illinois, United States |
| Niederlage | 18-11 | Mark Hunt  | KO (punch) |  | UFC Fight Night 85: Hunt vs Mir | Mar 19, 2016 | 1 | 3:01 | Brisbane, Australia  |
| Niederlage | 18-10 | Andrey Arlovski  | Decision (Unanimous) |  | UFC 191: Johnson vs Dodson 2 | Sep 05, 2015 | 3 | 5:00 | Las Vegas, United States |
| Sieg | 18-9 | Todd Duffee | KO (Punch) |  | UFC Fight Night: Mir vs Duffee | Jul 15, 2015 | 1 | 1:13 | San Diego, United States |
| Sieg | 17-9 | Antonio Silva  | KO (punches and elbows) |  | UFC Fight Night: Mir vs Bigfoot | Feb 22, 2015 | 1 | 1:40 | Porto Alegre, Brazil |
| Niederlage | 16-9 | Alistair Overeem  | Decision (unanimous) |  | UFC 169: Barao vs Faber II | Feb 01, 2014 | 3 | 5:00 | Newark, United States |
| Niederlage | 16-8 | Josh Barnett | TKO (knee and punches) | | UFC 164 | Aug 31, 2013 | 1 | 1:56 | Milwaukee, United States |
| Niederlage | 16-7 | Daniel Cormier | Decision (unanimous) | | UFC on Fox 7: Henderson vs Melendez | Apr 20, 2013 | 3 | 5:00 | San Jose, United States |
| Niederlage | 16-6 | Junior dos Santos | TKO (punches) |  | UFC 146: Dos Santos vs Mir | May 26, 2012 | 2 | 3:04 | Las Vegas, United States |
| Sieg | 16-5 | Antonio Rodrigo Nogueira | Technical Submission |  | UFC 140 | Dec 10, 2011 | 1 | 3:38 | Toronto, Ontario, Canada |
| Sieg | 15-5 | Roy Nelson | Decision (unanimous) | | UFC 130 | May 28, 2011 | 3 | 5:00 | Las Vegas, United States |
| Sieg | 14-5 | Mirko Filipović  | KO (knee) |  | UFC 119 | Sep 25, 2010 | 3 | 4:02 | Indianapolis, United States |
| Niederlage | 13-5 | Shane Carwin | KO (punches) | | UFC 111 | Mar 27, 2010 | 1 | 3:48 | Newark, United States |
| Sieg | 13-4 | Cheick Kongo  | Technical submission |  | UFC 107 | Dec 12, 2009 | 1 | 1:12 | Memphis, United States |
| Niederlage | 12-4 | Brock Lesnar | TKO (punches) | | UFC 100 | Jul 11, 2009 | 2 | 1:48 | Las Vegas, United States |
| Sieg | 12-3 | Antonio Rodrigo Nogueira | TKO (punches) |  | UFC 92 | Dec 27, 2008 | 2 | 1:57 | Las Vegas, United States |
| Sieg | 11-3 | Brock Lesnar | Submission (kneebar) | | UFC 81 | Feb 02, 2008 | 1 | 1:30 | Las Vegas, United States |
| Sieg | 10-3 | Antoni Hardonk | Submission (kimura) | | UFC 74 | Aug 25, 2007 | 1 | 1:17 | Las Vegas, United States |
| Niederlage | 9-3 | Brandon Vera | TKO (punches) |  | UFC 65 | Nov 18, 2006 | 1 | 1:09 | Sacramento, United States |
| Sieg | 9-2 | Dan Christison | Decision (unanimous) | | UFC 61 | Jul 08, 2006 | 3 | 5:00 | Las Vegas, United States |
| Niederlage | 8-2 | Márcio Cruz | TKO (punches and elbows) | | UFC 57 | Feb 04, 2006 | 1 | 4:10 | Las Vegas, United States |
| Sieg | 8-1 | Tim Sylvia | Technical submission | | UFC 48 | Jun 19, 2004 | 1 | 0:50 | Las Vegas, United States |
| Sieg | 7-1 | Wes Sims | KO (punches) | | UFC 46 | Jan 31, 2004 | 2 | 4:21 | Las Vegas, United States |
| Sieg | 6-1 | Wes Sims | DQ | | UFC 43 | Jun 06, 2003 | 1 | 2:55 | Las Vegas, United States |
| Sieg | 5-1 | David Abbott | Submission (toe hold) | | UFC 41 | Feb 28, 2003 | 1 | 0:45 | Atlantic City, United States |
| Niederlage | 4-1 | Ian Freeman | TKO (punches) | | UFC 38: Brawl at the Hall | Jul 13, 2002 | 1 | 4:35 | London, England |
| Sieg | 4-0 | Pete Williams | Submission | | UFC 36 | Mar 22, 2002 | 1 | 0:46 | Las Vegas, United States |
| Sieg | 3-0 | Roberto Traven | Submission (armbar) | | UFC 34 | Nov 02, 2001 | 1 | 1:05 | Las Vegas, United States |
| Sieg | 2-0 | Dan Quinn | Submission (triangle choke) | | I.F.C. Warriors Challenge 15 | Aug 31, 2001 | 1 | 2:15 | Oroville, United States |
| Sieg | 1-0 | Jerome Smith | Decision (unanimous) | | HOOKnSHOOT: Showdown | Jul 14, 2001 | 2 | 5:00 | Evansville, United States |
