Carlos Ulberg knocks out Jiri Prochazka in first round upset at UFC 327

Carlos Ulberg delivered one of the most dramatic finishes of 2026, stopping Jiri Prochazka by first-round knockout at UFC 327 on April 11 to reshape the light heavyweight division in stunning fashion.

Ulberg, known as "Black Jag," entered the fight ranked third at 185 pounds — one spot below Prochazka — but looked every bit the better man on the night. The 35-year-old New Zealander, training out of City Kickboxing, carries a 15-1 record and has built a reputation as one of the division's most dangerous strikers, landing 6.54 significant strikes per minute at 55 percent accuracy. He baited Prochazka into an opening and connected with a clean knockout blow, finishing the fight despite having suffered what appeared to be a knee injury during the exchange — a detail that only added to the magnitude of the performance.

Prochazka, the 33-year-old Czech contender ranked second in the world, came in with a 32-6-1 record and a well-earned reputation for high-volume, aggressive striking. Standing six-foot-three with an 80-inch reach, the Jetsaam Gym Brno product averages 5.69 significant strikes per minute and had been considered a heavy favorite heading into the contest. Instead, he absorbed a finish that raises real questions about where he goes from here.

Why it matters

• Ulberg jumps from third to a potential top-two ranking with a win over the man directly above him on the ladder
• The result puts Ulberg in serious contention for a light heavyweight title shot in the near future
• Both fighters share an orthodox stance and near-identical striking accuracy, but Ulberg's higher output proved decisive on the night
• Prochazka's second loss in recent memory complicates his path back to championship contention