| Sieg | 38-11-2 (1) | Roy Nelson  | Decision (Unanimous) |  | Bellator 216: MVP vs Daley | Feb 16, 2019 | 3 | 5:00 | Uncasville, Connecticut, United States |
| Sieg | 37-11-2 (1) | Roque Martinez | TKO (Cut) |  | Rizin 13 | Sep 30, 2018 | 1 | 4:58 | Saitama, Japan  |
| Sieg | 36-11-2 (1) | Tsuyoshi Kohsaka | TKO (Punches) |  | RIZIN Fighting World Grand Prix 2017: Final Round | Dec 31, 2017 | 1 | 1:02 | Saitama, Japan |
| Sieg | 35-11-2 (1) | Amir Aliakbari  | KO (Punches) |  | RIZIN Fighting World Grand Prix | Dec 31, 2016 | 1 | 2:03 | Saitama, Japan |
| Sieg | 34-11-2 (1) | Baruto Kaito  | TKO (Knee to the Body) |  | RIZIN Fighting World Grand Prix | Dec 31, 2016 | 1 | 0:49 | Saitama, Japan |
| Sieg | 33-11-2 (1) | Muhammed Lawal | TKO (Punches) |  | RIZIN Fighting World Grand Prix | Dec 29, 2016 | 2 | 6:41 | Saitama, Japan |
| Sieg | 32-11-2 (1) | Hyun Man Myung  | Submission (Arm-Triangle Choke) | | RIZIN Fighting World Grand Prix | Sep 25, 2016 | 1 | 2:20 | Saitama, Japan |
| Sieg | 31-11-2 (1) | Gabriel Gonzaga  | TKO (elbows and punches) |  | UFC Fight Night: Gonzaga vs Cro Cop 2 | Apr 11, 2015 | 3 | 3:30 | Krakow, Poland  |
| Sieg | 30-11-2 (1) | Satoshi Ishii | TKO (Head Kick and Punches) |  | IGF - Inoki Bom-Ba-Ye 2014 | Dec 31, 2014 | 2 | 5:00 | Tokyo, Japan |
| Sieg | 29-11-2 (1) | Satoshi Ishii | TKO (Doctor Stoppage) |  | IGF - Inoki Genome Fight 2 | Aug 23, 2014 | 2 | 2:37 | Ryogoku Kokugikan, Japan |
| Cancelled Bout | | Alexander Emelianenko  | - |  | Legend Part 2: Invasion | Nov 08, 2013 | - | - | Moscow, Russia |
| Niederlage | 28-11-2 (1) | Alexey Oleinik | Submission (scarf-hold headlock) |  | Legend Fight Show 2 | Nov 08, 2013 | 1 | 4:42 | Moscow, Russia |
| Sieg | 28-10-2 (1) | Shinichi Suzukawa | Submission (Armbar) |  | IGF - Inoki Bom-Ba-Ye 2012 | Dec 31, 2012 | 1 | 1:18 | Ryogoku Kokugikan, Japan |
| Niederlage | 27-10-2 (1) | Roy Nelson | TKO (punches) | | UFC 137 | Oct 29, 2011 | 3 | 1:30 | Las Vegas, United States |
| Niederlage | 27-9-2 (1) | Brendan Schaub | KO (punch) |  | UFC 128 | Mar 19, 2011 | 3 | 3:44 | Newark, United States |
| Niederlage | 27-8-2 (1) | Frank Mir | KO (knee) |  | UFC 119 | Sep 25, 2010 | 3 | 4:02 | Indianapolis, United States |
| Sieg | 27-7-2 (1) | Pat Barry | Submission (rear-naked choke) |  | UFC 115 | Jun 12, 2010 | 3 | 4:30 | Vancouver, Canada  |
| Sieg | 26-7-2 (1) | Anthony Perosh | TKO (doctor stoppage) |  | UFC 110 | Feb 21, 2010 | 2 | 5:00 | Sydney, Australia  |
| Niederlage | 25-7-2 (1) | Junior dos Santos | Submission (eye injury) |  | UFC 103 | Sep 19, 2009 | 3 | 2:00 | Dallas, United States |
| Sieg | 25-6-2 (1) | Mostapha Al-turk | TKO (punches) |  | UFC 99 | Jun 13, 2009 | 1 | 3:06 | Cologne, Germany  |
| Sieg | 24-6-2 (1) | Choi Hong-Man | TKO (low kick) |  | Dynamite!! 2008 | Dec 31, 2008 | 1 | 6:32 | Saitama, Saitama, Japan |
| NC | 23-6-2 (1) | Alistair Overeem  | No Contest |  | Dream 6 | Sep 23, 2008 | 1 | 6:09 | Saitama, Saitama, Japan |
| Sieg | 23-6-2 | Tatsuya Mizuno | TKO (punches) |  | Dream 1 | Mar 15, 2008 | 1 | 0:56 | Saitama, Saitama, Japan |
| Niederlage | 22-6-2 | Cheick Kongo  | Decision (unanimous) |  | UFC 75 | Sep 08, 2007 | 3 | 1:36 | London, England  |
| Niederlage | 22-5-2 | Gabriel Gonzaga | KO (head kick) |  | UFC 70 | Apr 21, 2007 | 1 | 4:51 | Manchester, England |
| Sieg | 22-4-2 | Eddie Sanchez | TKO (punches) |  | UFC 67 | Feb 03, 2007 | 1 | 4:33 | Las Vegas, United States |
| Sieg | 21-4-2 | Josh Barnett | Submission (punches) |  | Pride Final Conflict Absolute | Sep 10, 2006 | 1 | 7:32 | Saitama, Saitama, Japan |
| Sieg | 20-4-2 | Wanderlei Silva | KO (head kick) |  | Pride Final Conflict Absolute | Sep 10, 2006 | 1 | 5:22 | Saitama, Saitama, Japan |
| Sieg | 19-4-2 | Hidehiko Yoshida | TKO (leg kicks) |  | Pride Critical Countdown Absolute | Jul 01, 2006 | 1 | 7:38 | Saitama, Saitama, Japan |
| Sieg | 18-4-2 | Ikuhisa Minowa | TKO (punches) |  | Pride Total Elimination Absolute | May 05, 2006 | 1 | 1:10 | Osaka, Osaka, Japan |
| Niederlage | 17-4-2 | Mark Hunt  | Decision (split) |  | Pride Shockwave 2005 | Dec 31, 2005 | 3 | 5:00 | Saitama, Saitama, Japan |
| Sieg | 17-3-2 | Josh Barnett | Decision (unanimous) | | Pride 30 | Oct 23, 2005 | 3 | 5:00 | Saitama, Saitama, Japan |
| Niederlage | 16-3-2 | Fedor Emelianenko | Decision (unanimous) |  | Pride Final Conflict 2005 | Aug 28, 2005 | 3 | 5:00 | Saitama, Saitama, Japan |
| Sieg | 16-2-2 | Ibragim Magomedov | KO (kick to the body) |  | Pride Critical Countdown 2005 | Jun 26, 2005 | 1 | 3:53 | Saitama, Saitama, Japan |
| Sieg | 15-2-2 | Mark Coleman | KO (punches) |  | Pride 29 | Feb 20, 2005 | 1 | 3:40 | Saitama, Saitama, Japan |
| Sieg | 14-2-2 | Kevin Randleman | Submission (guillotine choke) | | Pride Shockwave 2004 | Dec 31, 2004 | 1 | 0:41 | Saitama, Saitama, Japan |
| Sieg | 13-2-2 | Josh Barnett | Submission (shoulder injury) | | Pride 28 | Oct 31, 2004 | 1 | 0:46 | Saitama, Saitama, Japan |
| Sieg | 12-2-2 | Alexander Emelianenko | KO (head kick) | | Pride Final Conflict 2004 | Aug 15, 2004 | 1 | 2:09 | Saitama, Saitama, Japan |
| Sieg | 11-2-2 | Shungo Oyama | TKO (punches) | | Pride Bushido 4 | Jul 19, 2004 | 1 | 1:00 | Nagoya, Aichi, Japan |
| Sieg | 10-2-2 | Hiromitsu Kanehara | Decision (unanimous) | | Pride Bushido 3 | May 23, 2004 | 2 | 5:00 | Yokohama, Kanagawa, Japan |
| Niederlage | 9-2-2 | Kevin Randleman | KO (punches) | | Pride Total Elimination 2004 | Apr 25, 2004 | 1 | 1:57 | Saitama, Saitama, Japan |
| Sieg | 9-1-2 | Yoshihisa Yamamoto | TKO (punches) | | Pride Bushido 2 | Feb 15, 2004 | 1 | 2:12 | Saitama, Saitama, Japan |
| Sieg | 8-1-2 | Ron Waterman | TKO (soccer kicks) | | Pride 27 | Feb 01, 2004 | 1 | 4:37 | Osaka, Osaka, Japan |
| Niederlage | 7-1-2 | Antonio Rodrigo Nogueira | Submission (armbar) | | Pride Final Conflict 2003 | Nov 09, 2003 | 2 | 1:45 | Tokyo, Japan |
| Sieg | 7-0-2 | Alberto Rodriguez | KO (head kick) | | Pride Bushido 1 | Oct 05, 2003 | 1 | 0:46 | Saitama, Saitama, Japan |
| Sieg | 6-0-2 | Igor Vovchanchyn  | KO (head kick) | | Pride Total Elimination 2003 | Aug 10, 2003 | 1 | 1:29 | Saitama, Saitama, Japan |
| Sieg | 5-0-2 | Heath Herring | TKO | | Pride 26 | Jun 08, 2003 | 1 | 3:17 | Yokohama, Kanagawa, Japan |
| Sieg | 4-0-2 | Kazuyuki Fujita | Decision (unanimous) | | Inoki Bom-Ba-Ye 2002 | Dec 31, 2002 | 3 | 5:00 | Saitama, Saitama, Japan |
| Sieg | 3-0-2 | Kazushi Sakuraba | TKO (eye injury) | | Pride Shockwave | Aug 28, 2002 | 2 | 5:00 | Tokyo, Japan |
| Unentschieden | 2-0-2 | Wanderlei Silva | Draw |  | Pride 20 | Apr 28, 2002 | 5 | 3:00 | Yokohama, Kanagawa, Japan |
| Sieg | 2-0-1 | Yuji Nagata | TKO (punches) | | Inoki Bom-Ba-Ye 2001 | Dec 31, 2001 | 1 | 0:21 | Saitama, Saitama, Japan |
| Unentschieden | 1-0-1 | Nobuhiko Takada | Draw | | Pride 17 | Nov 03, 2001 | 5 | 3:00 | Tokyo, Japan |
| Sieg | 1-0 | Kazuyuki Fujita | TKO (cut) | | K-1: Andy Hug Memorial | Aug 19, 2001 | 1 | 0:39 | Saitama, Saitama, Japan |
