William "Lil Bull" Vianna
| First Name : | William |
| Last name : | Vianna |
| Nickname : | Lil Bull |
| Height : | 5'6" (171cm) |
| Weight : | 143 lbs (65 kg) |
| Birth Date : | 1977-08-08 |
| Country : | Brazil |
| Record : | 1 - 2 - 0 (Wins - Losses - Draws) |
| Wins : | 1 Submission (Rear Naked Choke) (100%) |
| Losses : |
1 Decision (Unanimous) (50%) 1 KO (Punch) (50%) |
| Association : | Tata Fight Team |
| Match Stats | ||||||
| Result | Opponent | Method | Event Title | Date | Round | Time |
| Lost | Will Ribeiro | KO (Punch) | Shooto - Brazil 4 | Oct 27, 2007 | 3 | 3:38 Sec |
| Lost | Marlon Sandro | Decision (Unanimous) | Shooto - Brazil 2 | Mar 24, 2007 | 3 | 5:00 Sec |
| Win | Leonardo Rodrigues | Submission (Rear Naked Choke) | Shooto Brazil 1 - The Return | Dec 3, 2006 | 2 | 4:40 Sec |