Vaclav Sivak Extends Unbeaten Streak to 37-0 at RFA 34
Czech kickboxing star Václav Sivák defeated Brandon Fos by a third-round technical knockout on October 17, 2026, at the RFA 34 event in Zilina, Slovakia, successfully defending his 70-kilogram title. Sivák neutralized the Enfusion champion and former Tadeáš Růžička opponent with persistent low kicks before landing a decisive knee that forced a referee count and prompted Fos to concede. With the victory, Sivák pushed his professional combat record to 37 wins and zero losses.
The Fight Details and Zilina Bout
Contested at the Tipsport Arena under K-1 rules, the main event featured a tightly contested opening two rounds where Sivák managed distance against the shorter reach of Curacao native Brandon Fos. In the third round, Sivák shifted momentum by deploying heavy calf kicks that compromised Fos’s mobility. A subsequent knee strike dropped Fos to the canvas for a count, and the challenger signaled he could not continue as the round concluded. Sivák entered the ring following a training camp shift, executing a game plan that kept him in control throughout the bout’s late stages.
Upcoming Bouts in Prague and Bratislava
The Zilina title defense marks the first of three fights Sivák scheduled across a two-month span. On November 27, 2026, he faces Patrik Záděra in a 75-kilogram real-fight match inside small gloves at RFA 35 in Prague. He then moves to Bratislava on December 12, 2026, to meet Václav Mikulášk in a boxing match at Fight Night Challenge 12. Sivák expressed an intent to maintain an active monthly competition schedule.
Transition to ONE Championship and RFA Plans
Beyond his remaining 2026 calendar, Sivák confirmed a multi-fight trajectory toward the international promotion ONE Championship, where he holds a contract beginning in January 2027. The arrangement operates as an exclusive deal permitting co-promotion with RFA, where Sivák retains five remaining fights under his current agreement. RFA promoter Boris Marhanský stated that the organization plans to match its top star against high-level international opponents next year, including Mamuka Usubyan and K.O.
Frequently Asked Questions
Who did Václav Sivák defeat at RFA 34?
Sivák defeated Brandon Fos, a two-time Enfusion champion from Curacao who previously defeated Tadeáš Růžička, via a third-round technical knockout in Zilina.
What is Václav Sivák’s professional combat sports record?
Following his victory on October 17, 2026, Sivák extended his professional record to 37 wins and zero losses.
What are Sivák’s remaining fight dates for 2026?
Sivák is scheduled to face Patrik Záděra in Prague on November 27, 2026, followed by a boxing match against Václav Mikulášk at Fight Night Challenge 12 in Bratislava on December 12, 2026.
Which international organization signed Václav Sivák for 2027?
Sivák signed an agreement with ONE Championship to begin competing in international bouts starting in January 2027 while maintaining a dual arrangement with RFA.