William Underwood
“Bill”
Standout achievements
William Underwood is an American mixed martial artist with a professional record of 4-6 across 10 bouts. They've won 1 by KO/TKO, 2 by submission and 1 by decision — a 75 % finish rate. Most wins come by submission. Currently on a 3-fight skid. Last competed March 2026 (active). Has fought most often in United States (10 bouts).
Fight locations (2 venues)
Career timeline — fights by year
Frequently asked
What is William Underwood's MMA record?
William Underwood has a professional MMA record of 4-6 — 1 wins by KO/TKO, 2 by submission, 1 by decision.
How does William Underwood usually win?
They most often win by submission (2 of 4 wins).
How does William Underwood usually lose?
Most of William Underwood's losses come by submission (3 of 6).
Is William Underwood still active?
William Underwood last competed in March 2026, and is considered active (no bout in over two years).
What is William Underwood's fastest finish?
KO/TKO of Jon Viscuso in 0:09 (Rd 1) at AAMMA 24 - Absolute Action MMA 24.
Where is William Underwood from?
William Underwood is a American mixed martial artist.
What is William Underwood's longest MMA win streak?
William Underwood's longest winning run on record is 2 straight victories.
Where does William Underwood rank in MMA?
William Underwood sits at #27,940 of 32,631 fighters in the Fight Forensics global MMA rankings.