Bartosiński vs Łopaczyk headlines KSW 123 on Saturday, November 21, 2026, at the Enea Arena in Szczecin. Adrian Bartosiński (19-1) puts his welterweight title on the line for the 6th time against Tymoteusz Łopaczyk (14-4). Right before, Valeriu Mircea and Marcin Held fight for the lightweight belt, vacant since Salahdine Parnasse left.
Key takeaways
- KSW 123: Adrian Bartosiński (19-1) defends his welterweight title against Tymoteusz Łopaczyk (14-4) on November 21 at the Enea Arena in Szczecin.
- Champion since April 2023, Bartosiński has kept his belt 5 times. He was due to face Adam Masaev at KSW 122, but Masaev got injured.
- In the co-main event, Valeriu Mircea (32-9-1) and Marcin Held (31-11) fight for the lightweight title left vacant by Salahdine Parnasse.
Bartosiński vs Łopaczyk, the KSW 123 welterweight title
Date and venue
KSW 123 takes place on Saturday, November 21, 2026, at the Enea Arena in Szczecin, Poland. The card has 2 championship fights, each scheduled for 5 rounds.
A fight on the move
Bartosiński was set to defend his belt on October 10 at KSW 122 in Rzeszów against Adam Masaev. Masaev got injured, and on September 3 KSW made a new challenger and a new date official: Łopaczyk, in Szczecin. The champion made no secret of his frustration at the 5-week delay.
The weight limit
The welterweight title is contested at 77.1 kg (170 lb). Bartosiński is 31, Łopaczyk is 30.
Adrian Bartosiński vs Tymoteusz Łopaczyk, 2 different paths
Bartosiński, a 3-year reign
Bartosiński won the welterweight belt at KSW 81 in April 2023 with a 1st-round TKO of Artur Szczepaniak. He has since kept it against Salahdine Parnasse, Igor Michaliszyn, Andrzej Grzebyk, Muslim Tulshaev and Madars Fleminas, the last one by split decision at KSW 116 in March. His only loss came in November 2024 against Mamed Khalidov, with no title at stake.
Łopaczyk, ranked No. 3
Łopaczyk comes in off a 3rd-round guillotine of Andrzej Grzebyk at KSW 119 in June. Before that, he lost a decision to Madars Fleminas at KSW 110 in September 2025. In March 2025, he beat Oskar Szczepaniak by 1st-round TKO.
Common opponents
Grzebyk and Fleminas link the 2 men. Bartosiński beat both on the scorecards. Łopaczyk submitted Grzebyk but lost to Fleminas.
We had agreed on a slightly different date, so I'm simply not happy about that.
Mircea vs Held and the rest of the KSW 123 card
A lightweight belt up for grabs
The lightweight title has been vacant since Salahdine Parnasse left KSW in April 2026. Valeriu Mircea, a former interim champion, is coming off a 2nd-round TKO of Roman Szymański at KSW 118 in May. Marcin Held lost his last fight, by TKO to Parnasse in January, but beat Marian Ziółkowski in November 2025.
The other fights
The card also features Tomasz Romanowski vs Igor Michaliszyn at middleweight, Maciej Kazieczko vs Bohdan Danylko and Wojciech Kawa vs Oleksandr Moisa at lightweight, and Madars Fleminas vs Mateusz Pawlik at welterweight.
What to watch
Bartosiński can secure a 6th defense, and Szczecin will crown a new lightweight champion. Follow Bartosiński vs Łopaczyk, the KSW 123 results and the fighter profiles in the FightHub app.
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- Salahdine Parnasse needed 155 seconds to turn his UFC debut into a coronation
