Marcus "Conan" Silveira born in Brazil is a mixed martial arts fighter. He competes in the Heavyweight division. He won his last fight at PFL - Genesis against Johnathan Ivey on March 31, 2007. Conan has also been arrested in drug-related charges.
| Career Statistics: | |
| Knockout Wins: 0 (0%) | Knockout Losses: 0 (0%) |
| TKO Wins: 2 (18%) | TKO Losses: 2 (18%) |
| Submission Wins: 3 (27%) | Submission Losses: 2 (18%) |
| Decision Wins: 0 (0%) | Decision Losses: 0 (0%) |
| Draws: 0 | No Contests: 1 |
| Career Fights: | |||||
| Opponent | Method | Event | Date | Rnd | |
| Win | Johnathan Ivey | Technical Knockout | PFL: Genesis | Mar. 31, 2007 | 2 |
| Loss | Wes Sims | Technical Knockout | Hook n Shoot: Absolute Fighting Championships 1 | Dec. 13, 2002 | 2 |
| Loss | Dan Severn | Submission | WEF 9: World Class | May. 13, 2000 | 1 |
| Win | Maurice Smith | Submission | WEF 7: Stomp in the Swamp | Oct. 09, 1999 | 2 |
| Win | Patrick Smith | WEF 5: World Extreme Fighting 5 | Jun. 12, 1999 | ||
| Loss | Kazushi Sakuraba | Submission | UFC 15.5: Ultimate Japan 1 | Dec. 21, 1997 | 1 |
| NC | Kazushi Sakuraba | No Contest - Premature Stoppage | UFC 15.5: Ultimate Japan 1 | Dec. 21, 1997 | 1 |
| Loss | Maurice Smith | Technical Knockout | EF 3: Extreme Fighting 3 | Oct. 18, 1996 | 3 |
| Win | Carl Franks | Technical Knockout | EF 2: Extreme Fighting 2 | Apr. 26, 1996 | 1 |
| Win | Gary Myers | Submission | EF 1: Extreme Fighting 1 | Nov. 18, 1995 | 1 |
| Win | Victor Tatarkin | Submission | EF 1: Extreme Fighting 1 | Nov. 18, 1995 | 1 |
| Total Fights: 11 | Record: 6 - 4 (1 NC) | |||||
Quarterly Rankings
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