Photo Credit: sergiusz.zajac.ko/instagram
Sergiusz Zając MMA Profile Record, Stats, Biography, KSW Career & Fight History

Sergiusz Zając MMA Profile Record, Stats, Biography, KSW Career & Fight History

Nicholas Thompson 2ByNicholas Thompson Hours
Photo Credit: sergiusz.zajac.ko/instagram
Sergiusz Zajac

SERGIUSZ ZAJAC

Poland Flag POLAND • HEAVYWEIGHT
W-L-D 10-2-0
(T)KO 9-1
SUB 0-1
BIOGRAPHY
COUNTRY Poland
WT CLASS Heavyweight
HT / WT 6′ 4″, 215 lbs
BIRTHDATE 10/09/1998 (28)
STANCE Orthodox
REACH 74.4″ (189cm)
TEAM / RESIDENCE Spartakus Rzeszow • Mielec, Poland
NICKNAME
RESOURCE LINKS
Wikipedia Wikipedia Sherdog Sherdog Tapology Tapology Best Fight Odds Best Fight Odds
PERSONAL LINKS
Instagram Instagram
CAREER HONOURS & HISTORICAL RECORDS
🏆
Top-Ranked KSW Contender Ranked Inside the Official KSW Top 5
⚡
90% Knockout Ratio 9 of 10 Professional Victories via KO/TKO
🔥
8 First-Round Stoppages Devastating Power Puncher & Lethal Muay Thai Clinch
🥇
Undefeated Babilon MMA Run 4-0 Record in Poland’s Premier Proving Ground
Sergiusz Zajac Record
WINS10
KO/TKO
9
SUB
0
DECISION
1
LOSSES2
KO/TKO
1
SUB
1
DECISION
0
DRAWS0
DR
0
NO CONTEST0
NC
0
Percentage Statistics

Calculated from 12 professional bouts (10-2-0).

Win Rate

10 wins · 12 bouts

Loss Rate

2 losses · 12 bouts

Finish Rate

9 finishes · 12 bouts

KO/TKO Rate

9 KO/TKOs · 12 bouts

Submission Rate

0 submissions · 12 bouts

Decision Rate

1 decision · 12 bouts

SERGIUSZ ZAJAC FIGHT HISTORY – PRO
RESULT
FIGHTER
EVENT
METHOD
DURATION/DATE
WIN
Salim El Ouassaidi France France
KSW 122 – Yakymenko vs. Morelli
Oct / 10 / 2026
KO (Elbows and Punches)
Rnd 1 (1:09) Oct / 10 / 2026
ROUND1
TIME1:09
METHODKO (Elbows and Punches)
Bout Specifications & Fight Financials View Dossier arrow
🥊 KSW 122 Main Card Feature • Zajac vs. El Ouassaidi
Main Card Feature
Fighter MatchupSergiusz Zajac vs Salim El Ouassaidi
Fight LocationPoland Rzeszow, Poland (Podpromie Hall)
Duration3 x 5 min
Weights Matchup215 lbs vs 215 lbs (Catchweight)
Salim El Ouassaidi Record at Bout (Opponent)12-4-0
Sergiusz Zajac Record at Bout9-2-0
💰 Pre-Fight Betting Odds
Sergiusz Zajac: -500 (Favorite) vs Salim El Ouassaidi: +350 (Underdog)
Officials
Ref: Aleh Miliakou
🥊 Action & Knockdowns:
Fighting in front of his home crowd in Rzeszow, Zajac blitzed French powerhouse Salim “Bizon” El Ouassaidi from the opening bell, trapping him along the cage with a violent barrage of elbows and punches to score a knockout in just 69 seconds.
LOSS
Damian Piwowarczyk Poland Poland
KSW 116 – Bartosinski vs. Fleminas
Mar / 14 / 2026
TKO (Punches)
Rnd 2 (1:22) Mar / 14 / 2026
ROUND2
TIME1:22
METHODTKO (Punches)
Bout Specifications & Fight Financials View Dossier arrow
🥊 KSW 116 Co-Main Event • Piwowarczyk vs. Zajac
Co-Main Event
Fighter MatchupDamian Piwowarczyk vs Sergiusz Zajac
Fight LocationPoland Gorzow Wielkopolski, Poland (Arena Gorzow)
Duration3 x 5 min
Weights Matchup206 lbs vs 206 lbs
Damian Piwowarczyk Record at Bout (Opponent)10-4-0
Sergiusz Zajac Record at Bout9-1-0
💰 Pre-Fight Betting Odds
Damian Piwowarczyk: -130 (Favorite) vs Sergiusz Zajac: +110 (Underdog)
Officials
Ref: Tomasz Bronder
🥊 Action & Knockdowns:
In a high-stakes co-main event title eliminator, both light heavyweights traded heavy punches in round one before Piwowarczyk timed a counter right hand in round two, swarming with follow-up strikes on the canvas to force the stoppage at 1:22.
WIN
Mariusz Ksiazkiewicz Poland Poland
KSW 110 – Grzebyk vs. Tulshaev
Sep / 20 / 2025
KO (Punches)
Rnd 1 (1:07) Sep / 20 / 2025
ROUND1
TIME1:07
METHODKO (Punches)
Bout Specifications & Fight Financials View Dossier arrow
🥊 KSW 110 Main Card • Zajac vs. Ksiazkiewicz
Featured Bout
Fighter MatchupSergiusz Zajac vs Mariusz Ksiazkiewicz
Fight LocationPoland Rzeszow, Poland (Podpromie Hall)
Duration3 x 5 min
Weights Matchup205.3 lbs vs 205 lbs
Mariusz Ksiazkiewicz Record at Bout (Opponent)11-2-0
Sergiusz Zajac Record at Bout8-1-0
💰 Pre-Fight Betting Odds
Sergiusz Zajac: -333 (Favorite) vs Mariusz Ksiazkiewicz: +230 (Underdog)
Officials
Ref: Aleh Miliakou
🥊 Action & Knockdowns:
Zajac swarmed Canadian-Polish veteran Ksiazkiewicz immediately, causing a knee injury during an early exchange and landing vicious hammerfists on the mat to secure a 67-second knockout.
WIN
Michal Dreczkowski Poland Poland
KSW 104 – Kuberski vs. Romanowski
Mar / 08 / 2025
KO (Knee)
Rnd 1 (4:00) Mar / 08 / 2025
ROUND1
TIME4:00
METHODKO (Knee)
Bout Specifications & Fight Financials View Dossier arrow
🥊 KSW 104 Feature • Zajac vs. Dreczkowski
Featured Bout
Fighter MatchupSergiusz Zajac vs Michal Dreczkowski
Fight LocationPoland Gorzow Wielkopolski, Poland (Arena Gorzow)
Duration3 x 5 min
Weights Matchup206 lbs vs 205 lbs
Michal Dreczkowski Record at Bout (Opponent)5-0-0
Sergiusz Zajac Record at Bout7-1-0
💰 Pre-Fight Betting Odds
Sergiusz Zajac: -120 (Favorite) vs Michal Dreczkowski: -110 (Pick’em)
Officials
Ref: Tomasz Bronder
🥊 Action & Knockdowns:
In a matchup of top undefeated prospects, Zajac stuffed Dreczkowski’s takedown attempts and connected with a devastating Thai clinch knee directly to the chin that knocked Dreczkowski out at 4:00 of round one.
WIN
Kleber Silva Brazil Brazil
KSW 97 – Bajor vs. Scheffel
Aug / 24 / 2024
TKO (Submission to Elbows)
Rnd 1 (1:36) Aug / 24 / 2024
ROUND1
TIME1:36
METHODTKO (Submission to Elbows)
Bout Specifications & Fight Financials View Dossier arrow
🥊 KSW Debut • Zajac vs. Silva
KSW Debut
Fighter MatchupSergiusz Zajac vs Kleber Silva
Fight LocationPoland Tarnow, Poland (Arena Jaskolka)
Duration3 x 5 min
Weights Matchup210 lbs vs 208 lbs (Catchweight)
Kleber Silva Record at Bout (Opponent)22-12-0 (1 NC)
Sergiusz Zajac Record at Bout6-1-0
💰 Pre-Fight Betting Odds
Kleber Silva: -163 (Favorite) vs Sergiusz Zajac: +120 (Underdog)
Officials
Ref: Lukasz Bosacki
🥊 Action & Knockdowns:
In his promotional KSW debut, Zajac took Brazilian knockout artist Silva to the canvas, secured mount, and unleashed slicing elbows that forced Silva to verbally submit to strikes at 1:36 of round one.
WIN
Ramon Drum Brazil Brazil
Babilon MMA 45 – Rakowicz vs. Politylo
Jun / 01 / 2024
TKO (Elbows)
Rnd 1 (2:20) Jun / 01 / 2024
ROUND1
TIME2:20
METHODTKO (Elbows)
Bout Specifications & Fight Financials View Dossier arrow
🥊 Babilon MMA 45 Main Card • Zajac vs. Drum
Featured Bout
Fighter MatchupSergiusz Zajac vs Ramon Drum
Fight LocationPoland Nowy Targ, Poland (Miejska Hala Lodowa)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Ramon Drum Record at Bout (Opponent)3-1-0
Sergiusz Zajac Record at Bout5-1-0
Officials
Ref: Piotr Jarosz
🥊 Action & Knockdowns:
Zajac grounded Brazilian fighter Drum early in round one, moving to side control before raining down vicious elbows that compelled referee Piotr Jarosz to halt the bout at 2:20.
WIN
Bartlomiej Gladkowicz Poland Poland
Babilon MMA 42 – Gladkowicz vs. Zajac
Jan / 27 / 2024
Decision (Unanimous)
Rnd 3 (5:00) Jan / 27 / 2024
ROUND3
TIME5:00
METHODDecision (Unanimous)
Bout Specifications & Fight Financials View Dossier arrow
🥊 Babilon MMA 42 Main Event • Gladkowicz vs. Zajac
Main Event Feature
Fighter MatchupBartlomiej Gladkowicz vs Sergiusz Zajac
Fight LocationPoland Zyrardow, Poland (AQUA Zyrardow)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Bartlomiej Gladkowicz Record at Bout (Opponent)12-5-0
Sergiusz Zajac Record at Bout4-1-0
Officials & Scorecards
Ref: Piotr Jarosz Scorecard: 30-27 Scorecard: 29-28 Scorecard: 29-28
🥊 Action & Knockdowns:
Headlining Babilon MMA 42, Zajac outpointed KSW veteran “Clark Kent” Gladkowicz over 15 minutes, controlling distance with precise kicks and counters to take a unanimous decision victory.
WIN
Dominik Owsiany Poland Poland
Babilon MMA 38 – Lopaczyk vs. Jakimowicz
Sep / 22 / 2023
TKO (Elbows)
Rnd 1 (4:31) Sep / 22 / 2023
ROUND1
TIME4:31
METHODTKO (Elbows)
Bout Specifications & Fight Financials View Dossier arrow
🥊 Babilon MMA 38 Main Card • Zajac vs. Owsiany
Featured Bout
Fighter MatchupSergiusz Zajac vs Dominik Owsiany
Fight LocationPoland Chelm, Poland (Hala MOSiR)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Dominik Owsiany Record at Bout (Opponent)2-2-0
Sergiusz Zajac Record at Bout3-1-0
🥊 Action & Knockdowns:
Zajac dragged Owsiany to the canvas late in round one, securing mount and delivering a series of heavy elbows to force a TKO stoppage at 4:31.
WIN
Wincenty Krawczyk Poland Poland
Carpathian Warriors 10 – Road to Babilon
Oct / 01 / 2022
TKO (Knees and Punches)
Rnd 1 (2:50) Oct / 01 / 2022
ROUND1
TIME2:50
METHODTKO (Knees and Punches)
Bout Specifications & Fight Financials View Dossier arrow
🥊 Carpathian Warriors 10 Main Event • Zajac vs. Krawczyk
Main Event Feature
Fighter MatchupSergiusz Zajac vs Wincenty Krawczyk
Fight LocationPoland Rzeszow, Poland (Hala ROSiR)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Wincenty Krawczyk Record at Bout (Opponent)0-0-0
Sergiusz Zajac Record at Bout2-1-0
🥊 Action & Knockdowns:
Headlining in Rzeszow, Zajac overwhelmed Krawczyk in the clinch, landing heavy knees to the body and follow-up punches to score a dominant first-round TKO at 2:50.
WIN
Lukasz Kulpa Poland Poland
Babilon MMA 30 – Sudolski vs. Mysiala
Jul / 08 / 2022
TKO (Punches)
Rnd 1 (2:45) Jul / 08 / 2022
ROUND1
TIME2:45
METHODTKO (Punches)
Bout Specifications & Fight Financials View Dossier arrow
🥊 Babilon MMA Debut • Zajac vs. Kulpa
Babilon Debut
Fighter MatchupSergiusz Zajac vs Lukasz Kulpa
Fight LocationPoland Miedzyzdroje, Poland (Amfiteatr)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Lukasz Kulpa Record at Bout (Opponent)3-2-0
Sergiusz Zajac Record at Bout1-1-0
💰 Pre-Fight Betting Odds
Sergiusz Zajac: -138 (Favorite) vs Lukasz Kulpa: +100 (Underdog)
Officials
Ref: Piotr Jarosz
🥊 Action & Knockdowns:
In his promotional debut for Babilon MMA, Zajac timed Kulpa with a thunderous straight right hand, following up with ground strikes to seal a first-round TKO at 2:45.
WIN
Pawel Calkowski Poland Poland
Prime Show MMA 1 – Zadyma
Feb / 19 / 2022
TKO (Punches)
Rnd 3 (0:00) Feb / 19 / 2022
ROUND3
TIME–
METHODTKO (Punches)
Bout Specifications & Fight Financials View Dossier arrow
🥊 Prime Show MMA 1 Feature • Zajac vs. Calkowski
Featured Bout
Fighter MatchupSergiusz Zajac vs Pawel Calkowski
Fight LocationPoland Lodz, Poland (Atlas Arena)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Pawel Calkowski Record at Bout (Opponent)0-0-0
Sergiusz Zajac Record at Bout0-1-0
🥊 Action & Knockdowns:
Returning to professional action after a long hiatus, Zajac took control on the canvas, landing heavy ground-and-pound strikes to earn his first career victory via third-round TKO.
LOSS
Lukasz Olech Poland Poland
Opolscy Wojownicy 5 – Bitwa nad Odra
Nov / 27 / 2020
Submission
Rnd 1 Nov / 27 / 2020
ROUND1
TIME–
METHODSubmission
Bout Specifications & Fight Financials View Dossier arrow
🥊 Professional MMA Debut • Olech vs. Zajac
Pro Debut
Fighter MatchupLukasz Olech vs Sergiusz Zajac
Fight LocationPoland Opole, Poland (Stegu Arena)
Duration3 x 5 min
Weights Matchup205 lbs vs 205 lbs
Lukasz Olech Record at Bout (Opponent)0-0-0
Sergiusz Zajac Record at Bout0-0-0 (Debut)
🥊 Action & Knockdowns:
Making his professional mixed martial arts debut, Zajac was taken down early by grappling prospect Lukasz Olech, who locked in a submission in the opening frame.
SERGIUSZ ZAJAC NEWS
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