Oktagon 81 takes place on Sunday, with two big title fights topping the promotion’s final event of 2025.
In a massive main event, former ranked UFC heavyweight Martin Buday, who parted ways with the company off a win streak, faces double-champ Will Fleury for the promotion’s heavyweight crown. Fleury, a former Bellator MMA and PFL fighter, had won all four of his Oktagon assignments to date, capturing gold in the light heavyweight and heavyweight divisions.
Buday was making his debut in the bout, after winning his final three UFC fighters, including a victory over former champ Andrei Arlovski.
In the co-main event, champ Zhalgas Zhumagulov, another former UFC star, put his flyweight title on the line against challenger David Dvořák, who had gone 3-3 under the UFC banner and had won his last two bouts, including his Oktagon debut.
Where to Watch Oktagon 81
Sunday, December 28, 2025 sees Oktagon 81 take place at the O2 Arena in Prague, Czech Republic. The card streams live on Oktagon.tv, with free prelims available below. It all gets underway at 11:30AM ET, 8:30AM PT. Full results can be found below.
Oktagon 81: Fleury vs. Buday Results
Main Card
Will Fleury (c) vs. Martin Buday — for the Oktagon MMA heavyweight championship
Zhalgas Zhumagulov (c) vs. David Dvořák — for the Oktagon MMA flyweight championship
Patrik Kincl vs. Robert Pukač
Patrick Vespaziani vs. Daniel Škvor
Ondřej Raška vs. Pavel Tóth — Oktagon Celebrity Series
Preliminary Card
Miloš Petrášek vs. Mateusz Strzelczyk
Jonas Mågård vs. Elvis Silva
Veronika Smolková vs. Marta Sós
Vojtěch Khol vs. Hugo Vach
Alex Hutyra vs. Viktor Kováč
Ivan Klevets vs. Bartłomiej Skowyra
