1-4
Pro W–L
William Karlsson is a Swedish mixed martial artist with a professional record of 1-4 across 5 bouts. They've won 0 by KO/TKO, 0 by submission and 1 by decision. Last competed September 2025 (active). Has fought most often in Sweden (5 bouts).
Finish rate
0 %
Wins by
0 KO · 0 SUB · 1 DEC
Usually wins by
decision
Usually loses by
decision
Most fights in
Sweden 5
Last fought
Sep 2025 · Active
Career timeline — fights by year
Wins
Losses
Frequently asked
What is William Karlsson's MMA record?
William Karlsson has a professional MMA record of 1-4 — 0 wins by KO/TKO, 0 by submission, 1 by decision.
How does William Karlsson usually win?
They most often win by decision (1 of 1 wins).
How does William Karlsson usually lose?
Most of William Karlsson's losses come by decision (4 of 4).
Is William Karlsson still active?
William Karlsson last competed in September 2025, and is considered active (no bout in over two years).
Where is William Karlsson from?
William Karlsson is a Swedish mixed martial artist.
Pro MMA (5)
L
2025-04-19
Swedish MMA Federation - SMMAF: SFG Battle 14
· Swedish Mixed Martial Arts Federation (SMMAF)
R3 3:00
L
2024-10-05
Swedish MMA Federation - SMMAF: SFG Battle 13
· Swedish Mixed Martial Arts Federation (SMMAF)
R2 3:00