163 lb Catchweight3 rounds scheduled
RESULT
Mariusz Joniak def. Sebastian Romanowski (Decision)
Majority Decision · Round 3 · 5:00
Saturday, June 3, 2023
PGE Narodowy, Warsaw, Poland
Mariusz Joniak defeated Sebastian Romanowski by Majority Decision in round 3 (5:00) in the 163 lb Catchweight bout of KSW 83 - Colosseum 2, held Saturday, June 3, 2023 at PGE Narodowy, Warsaw.
Judges' Scorecards
Fan Scorecards
80%
Joniak
20%
Romanowski
5 fan scorecards submitted
●29–28 Joniak60%●29–28 Romanowski20%●29–27 Joniak20%
Fans' round-by-round verdict
R1
100%
Romanowski
R2
80%
Joniak
R3
80%
Joniak
Scorecard data via mmadecisions.com
Frequently asked questions
Who won Mariusz Joniak vs Sebastian Romanowski?
Mariusz Joniak defeated Sebastian Romanowski by Majority Decision in round 3 (5:00) in the 163 lb Catchweight bout of KSW 83 - Colosseum 2, held Saturday, June 3, 2023 at PGE Narodowy, Warsaw.
What were the judges' scorecards for Mariusz Joniak vs Sebastian Romanowski?
The judges scored it 28–28, 29–28, 29–27 — Mariusz Joniak won the decision.
Referee
Tomasz Bronder
Pre-fight comparison▾
Win probability
Mariusz Joniak 56%44% Sebastian Romanowski
What the model gave each fighter going into the fight, from their pre-fight UFCal Elo ratings. See all Elo ratings
Tale of the Tape
13-6-0
Record
14-11-1
1500
Elo rating
1455
1
Win Streak
0
28
Age
35
5'6"
168 cm
Height
5'8"
173 cm
67"
170 cm
Reach
68"
173 cm
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Stance
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163 lb Catchweight
Weight Class
163 lb Catchweight
Poland
Nationality
Poland
Striking Profile
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SLpM
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Str. Acc.
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SApM
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Str. Def.
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Grappling Profile
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TD Avg.
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TD Acc.
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TD Def.
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Sub. Avg.
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Recent form (last 5 fights)
Mariusz Joniak · 3-2
- WKSW 115 - Przybysz vs. YakymenkoSat, Feb 21, 2026Unanimous Decision · R3 · 5:00 · Bantamweight
- LKSW 98 - Paczuski vs. ZerhouniSat, Sep 14, 2024Submission · R2 · 1:22 · Bantamweight
- W
- LKSW 86 - Wiklacz vs. Przybysz 4Sat, Sep 16, 2023Knockout · R1 · 4:16 · Bantamweight
- WKSW 83 - Colosseum 2Sat, Jun 3, 2023Majority Decision · R3 · 5:00 · 163 lb Catchweight
Sebastian Romanowski · 0-4