What KSW 121 lacked in star power, in made up for with consequential fights in multiple weight classes. In the main event, heavyweights Štefan Vojčák and Marcin Wójcik faced off for an interim title, with the winner lined up for…
KSW 121 took place on Saturday, September 19, 2026, at the Home Credit Arena in Liberec, Czech Republic. The event featured a heavyweight main event between Štefan Vojčák and Marcin Wójcik for the interim heavyweight championship. The winner of this headliner is expected to face longtime champion Phil De Fries in a future title unification bout.
The card also featured a co-main event between middleweights Michał Michalski and Radosław Paczuski. Additionally, a welterweight bout between Muslim Tulshaev and Kacper Koziorzębski was scheduled. The event was broadcast live on CANAL+ in Poland and via KSWTV.com internationally.
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