| 2003-11-21 | UFC 45: Revolution | Heavyweight | Pedro Rizzo def. Ricco Rodriguez | Decision (unanimous) (30–27, 29–28, 30–27) | 3 | 5:00 |
| 2003-06-06 | UFC 43: Meltdown | Heavyweight | Pedro Rizzo def. Tra Telligman | TKO (doctor stoppage) | 2 | 4:24 |
| 2003-02-28 | UFC 41: Onslaught | Heavyweight | Vladimir Matyushenko def. Pedro Rizzo | Decision (unanimous) (29–28, 30–27, 29–28) | 3 | 5:00 |
| 2002-09-27 | UFC 39: The Warriors Return | Heavyweight | Gan McGee def. Pedro Rizzo | TKO (corner stoppage) | 1 | 5:00 |
| 2002-03-22 | UFC 36: Worlds Collide | Heavyweight | Pedro Rizzo def. Andrei Arlovski | KO (punches) | 3 | 1:45 |
| 2001-11-02 | UFC 34: High Voltage | Heavyweight | Randy Couture def. Pedro Rizzo title | TKO (punches) | 3 | 3:38 |
| 2001-05-04 | UFC 31: Locked and Loaded | Heavyweight | Randy Couture def. Pedro Rizzo title | Decision (unanimous) | 5 | 5:00 |
| 2001-02-23 | UFC 30: Battle on the Boardwalk | Heavyweight | Pedro Rizzo def. Josh Barnett | KO (punches) | 2 | 4:21 |
| 2000-09-22 | UFC 27: Ultimate Bad Boyz | Heavyweight | Pedro Rizzo def. Dan Severn | TKO (submission to kicks) | 1 | 1:33 |
| 2000-06-09 | UFC 26: Ultimate Field of Dreams | Heavyweight | Kevin Randleman def. Pedro Rizzo title | Decision (unanimous) | 5 | 5:00 |
| 1999-11-19 | UFC 23: Ultimate Japan 2 | Heavyweight | Pedro Rizzo def. Tsuyoshi Kohsaka | TKO (referee stoppage due to strikes) | 3 | 1:12 |
| 1999-05-07 | UFC 20: Battle for the Gold | Heavyweight | Pedro Rizzo def. Tra Telligman | KO (punch) | | 4:30 |
| 1999-01-08 | UFC 18: The Road to the Heavyweight Title | Heavyweight | Pedro Rizzo def. Mark Coleman | Decision (split) | | 15:00 |
| 1998-10-16 | UFC Brazil: Ultimate Brazil | Heavyweight | Pedro Rizzo def. Tank Abbott | KO (punch) | | 8:07 |