| Sieg | 28-4-1 | Ruben Villareal  | TKO (leg kicks) | | WFA: King of the Streets | Jul 22, 2006 | 1 | 3:24 | Los Angeles, California, United States |
| Sieg | 27-4-1 | Kevin Randleman | Decision (split) | | UFC 20 | May 07, 1999 | 1 | 21:00 | Birmingham, United States |
| Sieg | 26-4-1 | Tsuyoshi Kohsaka  | TKO (punches) | | UFC 18 | Jan 08, 1999 | 1 | 14:15 | Kenner, Louisiana, United States |
| Sieg | 25-4-1 | Kengo Watanabe | TKO (palm strikes) | | Pancrase: 1998 Anniversary Show | Sep 14, 1998 | 1 | 2:58 | Tokyo, Japan |
| Sieg | 24-4-1 | Keiichiro Yamamiya | Submission (rear-naked choke) | | Pancrase: Alive 11 | Dec 20, 1997 | 1 | 4:58 | Yokohama, Kanagawa, Japan |
| Sieg | 23-4-1 | Osami Shibuya | Submission (neck crank) | | Pancrase: 1997 Anniversary Show | Sep 06, 1997 | 1 | 3:15 | Urayasu, Chiba, Japan |
| Sieg | 22-4-1 | Takaku Fuke | Submission (armbar) | | Pancrase: Alive 7 | Jun 30, 1997 | 1 | 4:28 | Hakata, Fukuoka, Japan |
| Sieg | 21-4-1 | Kiuma Kunioku | Decision (lost points) | | Pancrase: Alive 4 | Apr 27, 1997 | 1 | 15:00 | Urayasu, Chiba, Japan |
| Unentschieden | 20-4-1 | Osami Shibuya | Draw | | Pancrase: Alive 3 | Mar 22, 1997 | 1 | 15:00 | Nagoya, Aichi, Japan |
| Sieg | 20-4 | Manabu Yamada | Submission (toe hold) | | Pancrase: Truth 7 | Oct 08, 1996 | 1 | 0:54 | Nagoya, Aichi, Japan |
| Sieg | 19-4 | Masakatsu Funaki | KO (knee) | | Pancrase: 1996 Anniversary Show | Sep 07, 1996 | 1 | 17:05 | Urayasu, Chiba, Japan |
| Sieg | 18-4 | Jason DeLucia | TKO (palm strike to liver) | | Pancrase: Truth 6 | Jun 25, 1996 | 1 | 8:48 | Fukuoka, Fukuoka, Japan |
| Sieg | 17-4 | Frank Shamrock | TKO (doctor stoppage) | | Pancrase: Truth 5 | May 16, 1996 | 1 | 11:11 | Tokyo, Japan |
| Sieg | 16-4 | Katsuomi Inagaki | TKO (knee to the body) | | Pancrase: Truth 4 | Apr 08, 1996 | 1 | 14:07 | Tokyo, Japan |
| Sieg | 15-4 | Guy Mezger | Submission (heel hook) | | Pancrase: Truth 2 | Mar 02, 1996 | 1 | 19:36 | Kobe, Hyogo, Japan |
| Sieg | 14-4 | Ryushi Yanagisawa | Submission (rear-naked choke) | | Pancrase: Eyes of Beast 7 | Dec 14, 1995 | 1 | 27:35 | Sapporo, Hokkaido, Japan |
| Sieg | 13-4 | Maurice Smith | Submission (rear-naked choke) | | Pancrase: Eyes of Beast 6 | Nov 04, 1995 | 1 | 4:34 | Yokohama, Kanagawa, Japan |
| Sieg | 12-4 | Minoru Suzuki | Submission (guillotine choke) | | Pancrase: 1995 Anniversary Show | Sep 01, 1995 | 1 | 15:35 | Tokyo, Japan |
| Sieg | 11-4 | Frank Shamrock | Decision (split) | | Pancrase: 1995 Neo-Blood Tournament Second Round | Jul 23, 1995 | 1 | 15:00 | Tokyo, Japan |
| Sieg | 10-4 | Jason DeLucia | Submission (toe hold) | | Pancrase: Eyes of Beast 5 | Jun 13, 1995 | 1 | 1:32 | Sapporo, Hokkaido, Japan |
| Sieg | 9-4 | Maurice Smith | Submission (kneebar) | | Pancrase: Eyes of Beast 4 | May 13, 1995 | 1 | 2:10 | Urayasu, Chiba, Japan |
| Sieg | 8-4 | Takaku Fuke | Submission (heel hook) | | Pancrase: Eyes of Beast 3 | Apr 08, 1995 | 1 | 1:52 | Nagoya, Aichi, Japan |
| Niederlage | 7-4 | Ken Shamrock | Submission (kneebar) | | Pancrase: Eyes of Beast 2 | Mar 10, 1995 | 1 | 1:01 | Yokohama, Japan |
| Sieg | 7-3 | Manabu Yamada | Technical Submission (arm-triangle choke) | | Pancrase: Eyes of Beast 1 | Jan 26, 1995 | 1 | 1:05 | Nagoya, Aichi, Japan |
| Niederlage | 6-3 | Frank Shamrock | Decision (majority) | | Pancrase: King of Pancrase Tournament Opening Round | Dec 16, 1994 | 1 | 10:00 | Tokyo, Japan |
| Sieg | 6-2 | Jason DeLucia | Submission (guillotine choke) | | Pancrase: Road to the Championship 5 | Oct 15, 1994 | 1 | 1:43 | Tokyo, Japan |
| Niederlage | 5-2 | Ken Shamrock | Submission (rear-naked choke) | | Pancrase: Road to the Championship 3 | Jul 26, 1994 | 1 | 16:42 | Tokyo, Japan |
| Sieg | 5-1 | Minoru Suzuki | TKO (knee to the body) | | Pancrase: Road to the Championship 2 | Jul 06, 1994 | 1 | 3:43 | Amagasaki, Hyogo, Japan |
| Sieg | 4-1 | Kazuo Takahashi | TKO (leg fracture) | | Pancrase: Road to the Championship 1 | May 31, 1994 | 1 | 1:37 | Tokyo, Japan |
| Sieg | 3-1 | Vernon White | Submission (guillotine choke) | | Pancrase: Pancrash! 3 | Apr 21, 1994 | 1 | 1:16 | Osaka, Osaka, Japan |
| Niederlage | 2-1 | Masakatsu Funaki | Submission (toe hold) | | Pancrase: Pancrash! 1 | Jan 19, 1994 | 1 | 2:58 | Yokohama, Kanagawa, Japan |
| Sieg | 2-0 | Takaku Fuke | TKO (knee to the body) | | Pancrase: Yes, We Are Hybrid Wrestlers 2 | Oct 14, 1993 | 1 | 2:03 | Nagoya, Aichi, Japan |
| Sieg | 1-0 | Ryushi Yanagisawa | KO (palm strike and knee) | | Pancrase: Yes, We Are Hybrid Wrestlers 1 | Sep 21, 1993 | 1 | 0:43 | Urayasu, Chiba, Japan |
