| Cancelled Bout | | Ronny Markes  | - |  | Bellator 241: Pitbull vs Carvalho | Mar 13, 2020 | - | - | Uncasville, Connecticut, United States |
| Cancelled Bout | | Ronny Markes | - |  | Bellator 235: Barnett vs Markes | Dec 20, 2019 | - | - | Honolulu, Hawaii, United States |
| Sieg | 35-8 | Andrey Arlovski  | Submission (rear-naked choke) |  | UFC Fight Night 93: Arlovski vs Barnett | Sep 03, 2016 | 3 | 2:53 | Hamburg, Germany  |
| Niederlage | 34-8 | Ben Rothwell  | Submission (gogo choke) |  | UFC on FOX 18: Johnson vs Bader | Jan 30, 2016 | 2 | 3:48 | Newark, United States |
| Sieg | 34-7 | Roy Nelson | Decision (Unanimous) |  | UFC Fight Night: Barnett vs Nelson | Sep 26, 2015 | 3 | 5:00 | Saitama, Japan |
| Niederlage | 33-7 | Travis Browne | KO (elbows) |  | UFC 168: Weidman vs Silva 2 | Dec 28, 2013 | 1 | 1:00 | Las Vegas, United States |
| Sieg | 33-6 | Frank Mir | TKO (knee and punches) | | UFC 164 | Aug 31, 2013 | 1 | 1:56 | Milwaukee, United States |
| Sieg | 32-6 | Nandor Guelmino  | Submission (arm triangle choke) |  | Strikeforce: Marquardt vs Saffiedine | Jan 12, 2013 | 1 | 2:11 | Oklahoma City, United States |
| Niederlage | 31-6 | Daniel Cormier | Decision (unanimous) |  | Strikeforce: Heavyweight Grand Prix | May 19, 2012 | 5 | 5:00 | San Jose, United States |
| Sieg | 31-5 | Sergei Kharitonov  | Submission (arm-triangle choke) |  | Strikeforce: Heavyweight Grand Prix | Sep 10, 2011 | 1 | 4:28 | Cincinnati, Ohio, United States |
| Sieg | 30-5 | Brett Rogers | Submission (arm-triangle choke) |  | Strikeforce: Heavyweight Grand Prix | Jun 18, 2011 | 2 | 1:17 | Dallas, Texas, United States |
| Sieg | 29-5 | Geronimo dos Santos | TKO (punches) | | Impact FC 1 | Jul 10, 2010 | 1 | 2:35 | July 10, 2010 |
| Sieg | 28-5 | Siala-Mou Siliga | Submission (kimura) | | Dream 13 | Mar 22, 2010 | 1 | 4:41 | Yokohama, Kanagawa, Japan |
| Sieg | 27-5 | Gilbert Yvel  | Submission (punches) |  | Affliction: Day of Reckoning | Jan 24, 2009 | 3 | 3:05 | Anaheim, United States |
| Sieg | 26-5 | Pedro Rizzo | KO (punch) | | Affliction: Banned | Jul 19, 2008 | 2 | 1:44 | Anaheim, United States |
| Sieg | 25-5 | Jeff Monson | Decision (unanimous) | | World Victory Road Presents: Sengoku 2 | May 18, 2008 | 3 | 5:00 | Tokyo, Japan |
| Sieg | 24-5 | Hidehiko Yoshida  | Submission (heel hook) |  | World Victory Road Presents: Sengoku 1 | Mar 05, 2008 | 3 | 3:23 | Tokyo, Japan |
| Niederlage | 23-5 | Antonio Rodrigo Nogueira | Decision (unanimous) |  | Pride Shockwave 2006 | Dec 31, 2006 | 3 | 5:00 | Saitama, Saitama, Japan |
| Sieg | 23-4 | Pawel Nastula  | Submission (toe hold) | | Pride 32 | Oct 21, 2006 | 2 | 3:04 | Las Vegas, United States |
| Sieg | 22-4 | Antonio Rodrigo Nogueira | Decision (split) |  | Pride Final Conflict Absolute | Sep 10, 2006 | 2 | 5:00 | Saitama, Saitama, Japan |
| Niederlage | 21-4 | Mirko Filipović  | Submission (punches) |  | Pride Final Conflict Absolute | Sep 10, 2006 | 1 | 7:32 | Saitama, Saitama, Japan |
| Sieg | 21-3 | Mark Hunt  | Submission (kimura) |  | Pride Critical Countdown Absolute | Jul 01, 2006 | 1 | 2:02 | Saitama, Saitama, Japan |
| Sieg | 20-3 | Alexander Emelianenko | Submission (keylock) | | Pride Total Elimination Absolute | May 05, 2006 | 2 | 1:57 | Osaka, Osaka, Japan |
| Sieg | 19-3 | Kazuhiro Nakamura | Submission (rear-naked choke) |  | Pride 31 | Feb 26, 2006 | 1 | 8:10 | Saitama, Saitama, Japan |
| Niederlage | 18-3 | Mirko Filipović | Decision (unanimous) | | Pride 30 | Oct 23, 2005 | 3 | 5:00 | Saitama, Saitama, Japan |
| Niederlage | 18-2 | Mirko Filipović | Submission (shoulder injury) | | Pride 28 | Oct 31, 2004 | 1 | 0:46 | Saitama, Saitama, Japan |
| Sieg | 18-1 | Rene Rooze | TKO (punches) | | K-1 MMA ROMANEX | May 22, 2004 | 1 | 2:15 | Saitama, Saitama, Japan |
| Sieg | 17-1 | Semmy Schilt | Submission (armbar) |  | Inoki Bom-Ba-Ye 2003 | Dec 31, 2003 | 3 | 4:48 | Kobe, Hyogo, Japan |
| Sieg | 16-1 | Yoshiki Takahashi | Submission (triangle armbar) | | NJPW: Ultimate Crush II | Oct 13, 2003 | 2 | 2:52 | Tokyo, Japan |
| Sieg | 15-1 | Yuki Kondo | Submission | | Pancrase: 10th Anniversary Show | Aug 31, 2003 | 3 | 3:26 | Tokyo, Japan |
| Sieg | 14-1 | Jimmy Ambriz | TKO (knee and punches) | | NJPW: Ultimate Crush | May 02, 2003 | 1 | 3:05 | Tokyo, Japan |
| Sieg | 13-1 | Randy Couture | TKO (punches) | | UFC 36 | Mar 22, 2002 | 2 | 4:35 | Las Vegas, United States |
| Sieg | 12-1 | Bobby Hoffman | Submission (punches) | | UFC 34 | Nov 02, 2001 | 2 | 4:25 | Las Vegas, United States |
| Sieg | 11-1 | Semmy Schilt | Submission (armbar) | | UFC 32 | Jun 29, 2001 | 1 | 4:21 | East Rutherford, United States |
| Niederlage | 10-1 | Pedro Rizzo | KO (punch) | | UFC 30 | Feb 23, 2001 | 2 | 4:21 | Atlantic City, United States |
| Sieg | 10-0 | Gan McGee | TKO (punches) | | UFC 28 | Nov 17, 2000 | 2 | 4:34 | Atlantic City, United States |
| Sieg | 9-0 | Dan Severn | Submission (armbar) | | SuperBrawl 16 | Feb 08, 2000 | 4 | 1:21 | Honolulu, United States |
| Sieg | 8-0 | Juha Tuhkasaari | Submission (armbar) | | SuperBrawl 13 | Sep 07, 1999 | 1 | 3:32 | Honolulu, United States |
| Sieg | 7-0 | John Marsh | Submission (kimura) | | SuperBrawl 13 | Sep 07, 1999 | 1 | 4:23 | Honolulu, United States |
| Sieg | 6-0 | Bobby Hoffman | Decision (unanimous) | | SuperBrawl 13 | Sep 07, 1999 | 3 | 5:00 | Honolulu, United States |
| Sieg | 5-0 | Trevor Howard | Submission (armbar) | | UFCF: Night of Champions | Sep 19, 1998 | 1 | N/A | Lynnwood, United States |
| Sieg | 4-0 | Bob Gilstrap | Disqualification | | UFCF: Night of Champions | Mar 14, 1998 | 1 | 0:42 | Washington, United States |
| Sieg | 3-0 | Chris Munsen | TKO (punches) | | UFCF: Road to the Championships 2 | Sep 06, 1997 | 1 | N/A | Washington, United States |
| Sieg | 2-0 | Bob Gilstrap | Decision (unanimous) | | UFCF: Road to the Championships 1 | Jul 07, 1997 | 1 | 10:00 | Washington, United States |
| Sieg | 1-0 | Chris Charnos | Submission (rear-naked choke) | | UFCF: Clash of the Titans | Jan 11, 1997 | 1 | 2:41 | Washington, United States |
