Oktagon 90: Fleury vs. Aras Preview: Full Fight Card Breakdown
OKTAGON MMA holds its first-ever event in Berlin on June 20, and the promotion has brought the stakes to match the occasion. Will Fleury defends the OKTAGON heavyweight title against German-Turkish challenger Kasim Aras at Uber Arena — a 17,000-seat venue that represents the biggest show the Czech-Slovak promotion has booked in Germany. The co-main adds a second title fight: Mateusz Legierski finally defends the OKTAGON lightweight belt against Gökan Aksu after an injury-forced cancellation months ago.
Full Fight Card
| Fight | Weight Class | Card Section |
|---|---|---|
| Will Fleury vs. Kasim Aras | Heavyweight (Title Fight) | Main Card |
| Mateusz Legierski vs. Gökan Aksu | Lightweight (Title Fight) | Main Card |
| Niko Samsonidse vs. Denis Frimpong | Lightweight | Main Card |
| Niklas Stolze vs. Tyrone Pfeifer | Welterweight | Main Card |
| Attila Korkmaz vs. Dawid Smielowski | Lightweight | Main Card |
| Arijan Topallaj vs. Jan Stanovský | Lightweight | Preliminary Card |
| Zafar Mohsen vs. Richie Smullen | Featherweight | Preliminary Card |
Main Event: Will Fleury vs. Kasim Aras — OKTAGON Heavyweight Title
Fleury is the kind of champion promotions build cards around. He holds both the OKTAGON heavyweight and light heavyweight belts simultaneously, is unbeaten inside the promotion, and walks into Berlin on a nine-fight win streak. His last outing at OKTAGON 81 in December 2025 lasted one minute and thirty-three seconds — a first-round TKO of former UFC heavyweight Martin Buday. He signed a six-fight extension with OKTAGON despite interest from other promotions, choosing to keep building what he has started in the organization. This is his third heavyweight title defense.
Kasim Aras earned this shot in Germany. He signed with OKTAGON in early 2025 and went 2-0 in the promotion, stopping Polish fighter Adam Pałasz in Hamburg and beating Italian Simon Biyong in Cologne. Both wins came on German soil, both were convincing, and both built his case in the German market that OKTAGON is deliberately cultivating. He campaigned vocally for the title fight. The promotion gave it to him in Berlin, where he will have the crowd.
That crowd dynamic is the story of this main event. Fleury has been unbeatable inside OKTAGON, but he has rarely operated this deep in opposition territory. Aras — a German-Turkish fighter based at KKS Sparta Aachen — is fighting in front of what will be a partisan Berlin audience. His record is 11-5 with experience at Bellator and multiple European promotions. He is aggressive, wrestling-based, and a real physical match at heavyweight. The odds favor Fleury's skill and streak; the crowd favors Aras.
Co-Main Event: Mateusz Legierski vs. Gökan Aksu — OKTAGON Lightweight Title
This fight was supposed to happen at OKTAGON 86 in Szczecin in April. Legierski broke his thumb in sparring and required surgery. The card was rebuilt around a replacement main event. Aksu had to wait.
Legierski won the OKTAGON lightweight belt at OKTAGON 80 in Munich with a five-round unanimous decision over Attila Korkmaz — a fight that went the distance and established him as a disciplined, durable champion. He comes back from thumb surgery with scrutiny on whether the hand held up in training camp.
Aksu has been knocking people out. He holds first-round stoppages over multiple opponents in OKTAGON, most recently a TKO of Denis Frimpong — who also appears on this card in a separate lightweight fight, giving OKTAGON 90 an interconnected divisional feel. The contender has been waiting for this title shot since the cancelled bout. A months-long wait either sharpens focus or dulls it; June 20 settles that question.
The lightweight division runs through this event. Attila Korkmaz — the same fighter Legierski beat for the title — is on the main card against Dawid Smielowski. Frimpong — the same fighter Aksu previously stopped — also fights. OKTAGON 90 is, in part, a reunion for the lightweight division.
Notable Bouts
Niklas Stolze vs. Tyrone Pfeifer — Welterweight, Main Card
Stolze is a German welterweight veteran with 14 professional bouts and a finishing record that mixes knockouts and submissions. Pfeifer is a rising German prospect. An all-German welterweight matchup in Berlin gives the main card local stakes beyond the title fights.
Niko Samsonidse vs. Denis Frimpong — Lightweight, Main Card
Samsonidse, a two-time OKTAGON featherweight title challenger moving up to lightweight, is fighting in his home city of Berlin. He has chased championships at featherweight and now steps up in weight for a fresh start. Frimpong is looking to bounce back from his loss to Aksu. A Berlin hometown fight for Samsonidse adds another local hook to the card.
What to Watch
In the main event, the opening rounds establish the tone. Fleury's first-round finishing power is well-documented; Aras needs to survive whatever Fleury brings early and make it a fight on his terms. If Fleury lands cleanly and the crowd goes quiet early, the fight tends to follow a familiar pattern. If Aras weathers the storm and imposes his wrestling, the partisan crowd becomes a factor in the championship rounds.
In the co-main, the central question is Legierski's hand. He is the more experienced champion; Aksu is the finisher with a point to prove after months of waiting. A fully healthy Legierski gives the edge in a five-rounder. Any physical uncertainty from the repaired thumb changes the calculation.
Oktagon 90 goes live from Uber Arena in Berlin on June 20.