Fighter

Sergiusz Zajac

9-2-0KSW #3Light Heavyweight Poland

PolandLast 5

Amateur MMA 10-9

NEXT FIGHT

vs Bartosz Szewczyk

KSWKSW 122 - Bartosinski vs. Masaev·Saturday, October 10, 2026

Sergiusz Zajac holds a professional MMA record of 9-2-0. Their full professional MMA career spans 14 bouts on record. Sergiusz Zajac has won 11 fights: 10 by KO/TKO, 0 by submission, 1 by decision. Of 3 career losses, 2 came by KO/TKO and 1 by submission. Most recent fight: March 14, 2026. Tracked organizations: KSW.

Profile

Height: 6'4"193 cm
Weight: 206 lbs93 kg
Reach: 74"188 cm
DOB: 1998-10-09
Age: 27
Nationality: Poland
Birthplace: Mielec, Poland

Upcoming

KSWKSW 122 - Bartosinski vs. MasaevOct 10, 2026
vs Bartosz SzewczykLight Heavyweight

Career history

LOSS
vs Damian Piwowarczyk
KSWKSW 116 - Bartosinski vs. Fleminas· Mar 14, 2026· Light Heavyweight· 9-1 vs 10-4
TKO
R2 · 1:22
WIN
vs Mariusz Ksiazkiewicz
KSWKSW 110 - Grzebyk vs. Tulshaev· Sep 20, 2025· Light Heavyweight· 8-1 vs 11-2
KO
R1 · 1:07
WIN
vs Michal Dreczkowski
KSWKSW 104 - Kuberski vs. Romanowski· Mar 8, 2025· Light Heavyweight· 7-1 vs 5-0
KO
R1 · 4:00
WIN
vs Kleber Silva
KSWKSW 97 - Bajor vs. Scheffel· Aug 24, 2024· 210 lb Catchweight· 6-1 vs 22-12
TKO
R1 · 1:36
WIN
vs Ramon Drum
Babilon MMA 45· Jun 1, 2024· Catchweight· 5-1 vs 1-1
TKO
R1 · 2:20
WIN
vs Bartlomiej Gladkowicz
Babilon MMA 42· Jan 27, 2024· Light Heavyweight· 4-1 vs 10-4
UD
WIN
vs Dominik Owsiany
Babilon MMA 38· Sep 22, 2023· Light Heavyweight· 3-1 vs 2-3
TKO
R1 · 4:31
WIN
vs Wincenty Krawczyk
Carpathian Warriors 10· Oct 1, 2022· Light Heavyweight· 2-1 vs 0-0
TKO
R1 · 2:50
WIN
vs Łukasz Kulpa
Babilon MMA 30· Jul 8, 2022· Light Heavyweight· 1-1 vs 3-2
TKO
R1 · 2:45
WIN
vs Paweł Całkowski
Prime Show MMA 1· Feb 19, 2022· Light Heavyweight· 0-1 vs 0-0
TKO
LOSS
vs Adam Biegański
The War 1· Jun 11, 2021· 2-1
TKO
WIN
vs Dawid Rachwał
The War 1· Jun 11, 2021· 1-1
TKO
WIN
vs Michał Więcławski
The War 1· Jun 11, 2021· 0-1
TKO
LOSS
vs Łukasz Olech
Opolscy Wojownicy 5· Nov 27, 2020· Catchweight· 0-0 vs 0-0
SUB

Career history data via Tapology.

Official KSW Ranking

Sergiusz Zajac's standing in the official KSW rankings.

Current: #3 Light Heavyweight
Peak: #3 Light Heavyweight
First ranked: Aug 1, 2026
Times ranked: 2

Light Heavyweight

View full KSW rankings →

UFCalendar Power Index rating

Current: 1725▼33
Peak: 1758Sep 20, 2025
Rated fights: 14

See the full Power Index →

Frequently asked questions

When does Sergiusz Zajac fight next?

Sergiusz Zajac fights Bartosz Szewczyk on Saturday, October 10, 2026 at KSW 122 - Bartosinski vs. Masaev.

What is Sergiusz Zajac's record?

Sergiusz Zajac's professional MMA record is 9-2-0.

Who is Sergiusz Zajac fighting next?

Sergiusz Zajac's next opponent is Bartosz Szewczyk at KSW 122 - Bartosinski vs. Masaev.

Who did Sergiusz Zajac fight last?

Sergiusz Zajac most recently fought Damian Piwowarczyk at KSW 116 - Bartosinski vs. Fleminas on Saturday, March 14, 2026, LOSS (TKO).

What weight class does Sergiusz Zajac fight in?

Sergiusz Zajac fights at Light Heavyweight.

How many knockouts does Sergiusz Zajac have?

Sergiusz Zajac has 10 wins by KO/TKO and 0 wins by submission.

How tall is Sergiusz Zajac?

Sergiusz Zajac is 6'4" (193 cm) tall.

How much does Sergiusz Zajac weigh?

Sergiusz Zajac weighs 206 lbs (93 kg).

What is Sergiusz Zajac's reach?

Sergiusz Zajac has a reach of 74" (188 cm).

How old is Sergiusz Zajac?

Sergiusz Zajac is 27 years old (born Oct 9, 1998).

Where is Sergiusz Zajac from?

Sergiusz Zajac is from Poland.

CAREER SUMMARY