Jiri Prochazka posted reflections after his loss to Carlos Ulberg, referencing a quote from his favorite book, Miyamoto Musashi's 'The Book of Five Rings.' Prochazka stated that mercy was inappropriate in the fight and that he needs to destroy that part of himself. He admitted he lost concentration and was caught by his opponent. The former champion apologized to fans for his performance and vowed to return stronger than ever. He also mentioned returning home to witness 'the miracle of life,' suggesting a personal milestone. The post debates whether Prochazka actually showed mercy or simply made a tactical error by losing focus while pursuing a finish against an injured opponent.
Jiri Prochazka has broken his silence following his loss to Carlos Ulberg, taking to social media to reflect on what went wrong and pledging to eradicate what he described as mercy from his approach inside the cage.
The Czech fighter, ranked second in the light heavyweight division at 33 years old, carries a record of 32-6-1 and is one of the most aggressive strikers in the 205-pound weight class. Standing six-foot-three with an 80-inch reach, Prochazka averages 5.69 significant strikes per minute at 55 percent accuracy — numbers that reflect his relentless, high-volume attack style. A former light heavyweight champion, he has built his reputation on chaotic, pressure-heavy performances, making the manner of this defeat particularly striking.
In his post, Prochazka drew on Miyamoto Musashi's "The Book of Five Rings," using the samurai philosopher's words to frame his self-criticism. He acknowledged losing concentration while hunting a finish against an injured opponent and admitted that mercy had no place in that moment. He apologized to fans and committed to returning stronger. He also referenced witnessing "the miracle of life" back home, hinting at a significant personal event.
Carlos Ulberg, the New Zealander known as Black Jag, improved to 15-1-0 with the victory and now sits third in the divisional rankings at 35 years old. Fighting out of City Kickboxing in Auckland, Ulberg stands six-foot-four and averages 6.54 significant strikes per minute — actually a higher output than Prochazka — at 55 percent accuracy. The win was a landmark result for a fighter steadily building one of the more impressive records in the division.
Why it matters
- Ulberg's win over a former champion dramatically strengthens his title case at light heavyweight
- Prochazka's ranking at number two will likely face pressure depending on upcoming divisional results
- The stylistic question Prochazka himself raised — mercy versus tactical error — speaks to a genuine tension in his aggressive, finish-at-all-costs approach
- Both fighters now figure prominently in any conversation about the next light heavyweight title contender
