Sergiusz Zając

Sergiusz Zając (born October 9, 1998) is a Polish professional mixed martial artist. He currently competes in the Light Heavyweight division of Konfrontacja Sztuk Walki (KSW).

Professional career Early career Zając made his professional debut on November 27, 2020 against Łukasz Olech. Zając lost the fight via a first-round submission.

After a year and a half away from the sport, he returned on February 19, 2022 against Paweł Całkowski. Zając won the fight via a third-round TKO.

Babilon MMA Zając made his debut under Babilon MMA on July 8, 2022 against Łukasz Kulpa. Zając won the fight via a first-round TKO.

Carpathian Warriors Zając made his debut under Carpathian Warriors on October 1, 2022 against Wincenty Krawczyk. Zając won the fight via a first-round TKO.

Return to Babilon MMA Zając returned to Babilon MMA on September 22, 2023 against Dominik Owsiany. Zając won the fight via a first-round TKO.

His next fight came on January 27, 2024 against Bartłomiej Gładkowicz. Zając won the fight via a Unanimous Decision.

His last fight under the federation came on June 1, 2024 against Ramon Drum. Zając won the fight via a first-round TKO.

Konfrontacja Sztuk Walki On August 15, 2024, it was announced that Zając had signed with Konfrontacja Sztuk Walki (KSW), and will be facing Kleber Raimundo Silva in his debut on August 24, 2024. The bout proceeded after Zając missed weight by 5.2 pounds. Despite missing weight, Zając won the fight via a first-round TKO.

His next fight came on March 8, 2025 against Michał Dreczkowski. Zając won the fight via a first-round TKO. This fight earned him his first Knockout of the Night bonus.

His next fight came on September 20, 2025 against debutant Mariusz Książkiewicz. Zając won the fight in the first round after Książkiewicz suffered a knee injury.

His next fight came on March 14, 2026, against Damian Piwowarczyk. Zając lost the fight via a second-round TKO. Despite the loss, this performance earned him his first Fight of the Night bonus.

Championships and accomplishments Mixed martial arts Konfrontacja Sztuk Walki Knockout of the Night (One time) Fight of the Night (One time)

Mixed martial arts record Loss

Damian Piwowarczyk TKO (punches) KSW 116

Gorzów Wielkopolski, Poland Win

Mariusz Książkiewicz TKO (knee injury) KSW 110

Rzeszów, Poland Win

Michał Dreczkowski KO (knee) KSW 104

Gorzów Wielkopolski, Poland Win

Kleber Raimundo Silva TKO (submission to elbows) KSW 97

Tarnów, Poland Win

Ramon Drum TKO (elbows) Babilon MMA 45

Nowy Targ, Poland Win

Bartłomiej Gładkowicz Decision (unanimous) Babilon MMA 42

Żyrardów, Poland Win

Dominik Owsiany TKO (elbows) Babilon MMA 38

Chełm, Poland Win

Wincenty Krawczyk TKO (knees and punches) Carpathian Warriors 10

Rzeszów, Poland Win

Łukasz Kulpa TKO (punches) Babilon MMA 30

Międzyzdroje, Poland Win

Paweł Całkowski TKO (punches) Prime Show MMA 1

Łódź, Poland Loss

Łukasz Olech Submission (rear-naked choke) Opolscy Wojownicy 5

Opole, Poland