Will Fleury to Defend Heavyweight Belt Against Martin Buday at Oktagon 81 in Prague on Dec. 28

Buday returns to Oktagon after the UFC declined to re-sign him despite a 7–1 run.

Overview

Oktagon 81 takes place Sunday at Prague’s O2 Arena with Fleury vs. Buday headlining the year-end card.
Fleury enters as the promotion’s double champion, holding both light heavyweight and heavyweight titles.
Sunday marks Fleury’s first heavyweight defense since winning the vacant belt in March against Lazar Todev following a hand-surgery layoff he called frustrating.
Buday is a former Oktagon heavyweight champion who went 7–1 in the UFC with wins that include Andrei Arlovski before his 2025 exit from the roster.
Fleury predicted the fight will not go past three rounds, while the co-main features Zhalgas Zhumagulov defending the flyweight title against David Dvořák.