The year 2025 is the 9th year in the history of the Oktagon MMA, a mixed martial arts promotion based in Czech Republic and Slovakia.

On December 18, 2024, it was announced that a Tipsport Gamechanger 3 took place in 2025, for the middleweight division. On same day, the promotion revealed first two fighters taking part in the tournament includes a current Oktagon Middleweight Champion Kerim Engizek and David Zawada. In the two weeks later, the promotion's has officially released the lineup includes Marek Mazúch, Miloš Petrášek, Vlasto Čepo, Samuel Krištofič, Ion Surdu, Andreas Michailidis, Mark Hulme, Matěj Peňáz, Mick Stanton, Piotr Wawrzyniak, Anthony Salamone and Krzysztof Jotko completed in the tournament. The tournament kicked off at Oktagon 66 on February 1.

Oktagon 66: Engizek vs. Oniszczuk was a mixed martial arts event held by Oktagon MMA on February 1, 2025, in Düsseldorf, Germany.

The first round of Oktagon Middleweight Tournament between the current Oktagon Middleweight Champion Kerim Engizek and Anthony Salamone was expected to headline the event. While, the event took place the first round middleweight tournament between Matěj Peňáz and David Zawada.

However, Salamone and Damien Lapilus were removed from the event due to two fighters respective doping violations and subsequent suspensions by the French Anti-Doping Agency. As a results, Lapilus opponent Lom-Ali Eskiev faced Wanderley Junior instead. Engizek faced Kamil Oniszczuk, who scheduled to face Hojat Khajevand at this event. Khajevand completed at this event against Kennedy Rayomba instead.

The following fighters received €5,000 bonus.

Oktagon 67: Creasey vs. Adamia was a mixed martial arts event held by Oktagon MMA on February 22, 2025, in Třinec, Czech Republic.

A Oktagon Flyweight Championship bout between current champion Sam Creasey and Beno Adamia headlined the event.