| Sieg | 20-11 | Andrew Flores Smith | TKO (Leg Kicks) |  | Face to Face 12: Rizzo vs Flores | Sep 12, 2015 | 1 | 5:00 | Vitoria, Espirito Santo, Brazil |
| Niederlage | 19-11 | Satoshi Ishii  | Decision (unanimous) |  | IGF: GENOME 26 | May 26, 2013 | 3 | 5:00 | Tokyo, Japan |
| Niederlage | 19-10 | Fedor Emelianenko  | KO (punches) | | M-1 Global: Fedor vs Rizzo | Jun 21, 2012 | 1 | 1:24 | St. Petersburg, Russia |
| Sieg | 19-9 | Ken Shamrock  | TKO (leg kicks & punches) |  | Impact FC 2 | Jul 18, 2010 | 1 | 3:33 | Sydney, Australia |
| Sieg | 18-9 | Gary Goodridge  | TKO (doctor stoppage) | | Washington Combat: Battle of the Legends | May 15, 2010 | 2 | 5:00 | Washington D.C. United States |
| Sieg | 17-9 | Jeff Monson | Decision (unanimous) | | Bitetti Combat MMA 4 | Sep 12, 2009 | 3 | 5:00 | Rio de Janeiro, Brazil |
| Niederlage | 16-9 | Gilbert Yvel  | KO (punches) |  | Ultimate Chaos: Lashley vs. Sapp 2009 | Jun 27, 2009 | 1 | 2:10 | Biloxi, United States |
| Niederlage | 16-8 | Josh Barnett | KO (punch) | | Affliction: Banned | Jul 19, 2008 | 2 | 1:44 | Anaheim, United States |
| Sieg | 16-7 | Jeff Monson | TKO (punches) | | Art of War 3 | Sep 01, 2007 | 3 | 2:40 | Dallas, Texas, United States |
| Sieg | 15-7 | Justin Eilers | Decision (unanimous) | | Art of War 1 | Mar 09, 2007 | 3 | 5:00 | Dallas, Texas, United States |
| Niederlage | 14-7 | Roman Zentsov | KO (punch) |  | Pride 31 - Dreamers | Feb 26, 2006 | 1 | 0:25 | Saitama, Japan |
| Niederlage | 14-6 | Sergei Kharitonov | TKO (soccer kick and punches) |  | Pride Critical Countdown 2005 | Jun 26, 2005 | 1 | 2:02 | Saitama, Saitama, Japan |
| Sieg | 14-5 | Ricco Rodriguez | Decision (unanimous) | | UFC 45 | Nov 21, 2003 | 3 | 5:00 | Uncasville, United States |
| Sieg | 13-5 | Tra Telligman | TKO (doctor stoppage) |  | UFC 43 | Jun 06, 2003 | 2 | 4:24 | Las Vegas, United States |
| Niederlage | 12-5 | Vladimir Matyushenko  | Decision (unanimous) |  | UFC 41 | Feb 28, 2003 | 3 | 5:00 | Las Vegas, United States |
| Niederlage | 12-4 | Gan McGee | TKO (corner stoppage) | | UFC 39 | Sep 27, 2002 | 1 | 5:00 | Uncasville, United States |
| Sieg | 12-3 | Andrey Arlovski | KO (punches) | | UFC 36 | Mar 22, 2002 | 3 | 1:45 | Paradise, United States |
| Niederlage | 11-3 | Randy Couture | KO (strikes) | | UFC 34 | Nov 02, 2001 | 3 | 1:38 | Las Vegas, United States |
| Niederlage | 11-2 | Randy Couture | Decision (unanimous) | | UFC 31 | May 04, 2001 | 5 | 5:00 | Atlantic City, United States |
| Sieg | 11-1 | Josh Barnett | KO (punch) | | UFC 30 | Feb 23, 2001 | 2 | 4:21 | Atlantic City, United States |
| Sieg | 10-1 | Dan Severn | TKO (leg kicks) | | UFC 27 | Sep 22, 2000 | 1 | 1:33 | New Orleans, United States |
| Niederlage | 9-1 | Kevin Randleman | Decision (unanimous) | | UFC 26 | Jun 09, 2000 | 5 | 5:00 | Cedar Rapids, United States |
| Sieg | 9-0 | Tsuyoshi Kohsaka | TKO (punches) | | UFC 23 | Nov 19, 1999 | 3 | 1:12 | Tokyo, Japan |
| Sieg | 8-0 | Tra Telligman | KO (punch) | | UFC 20 | May 07, 1999 | 1 | 4:30 | Birmingham, United States |
| Sieg | 7-0 | Mark Coleman | Decision (split) | | UFC 18 | Jan 08, 1999 | 1 | 15:00 | New Orleans, Louisiana, U.S. |
| Sieg | 6-0 | David Abbott | KO (punch) | | UFC Brazil | Oct 16, 1998 | 1 | 8:07 | Sao Paulo, Brazil |
| Sieg | 5-0 | Richard Heard | Submission (punishment) | | World Vale Tudo Championship 3 | Jan 19, 1997 | 1 | 13:12 | Brazil |
| Sieg | 4-0 | Vernon White | KO (soccer kick) | | World Vale Tudo Championship 2 | Nov 10, 1996 | 1 | 6:30 | Brazil |
| Sieg | 3-0 | Michael Tielrooy | Submission (keylock) | | World Vale Tudo Championship 2 | Nov 10, 1996 | 1 | 0:18 | Brazil |
| Sieg | 2-0 | Niccolaus Niccolaus | Submission (punches) | | World Vale Tudo Championship 2 | Nov 10, 1996 | 1 | 1:49 | Brazil |
| Sieg | 1-0 | Eric Labaille | TKO (punches) | | IMA: Battle of Styles | Oct 26, 1996 | 1 | 2:57 | Netherlands |
