Mariusz Książkiewicz

Mariusz Książkiewicz (born October 4, 1989) is a German-born Polish-Canadian professional mixed martial artist. He currently competes in the Light Heavyweight division for Konfrontacja Sztuk Walki. He is a former Unified MMA and Ignite Fights Light Heavyweight champion. He previously competed on Aggression Fighting Championship, Legacy Fighting Alliance, and Dana White's Contender Series.

Early life Książkiewicz was born on October 4, 1989 in Ludwigsburg, West Germany to Polish parents. He moved to Winnipeg at the age of 2.

Professional career Early career Książkiewicz made his professional debut on May 13, 2011 against Henry Rowsell. Książkiewicz won the fight via a first round submission.

Aggression Fighting Championship Książkiewicz made his debut with Aggression Fighting Championship on September 15, 2012 against Dejan Kajić. Książkiewicz won the fight via Unanimous Decision.

His next fight came on March 23, 2013 against Ash Mashreghi. Książkiewicz won the fight via a first round submsision.

Return to regionals His next fight came eight months later on November 15 against Steve Dubeck. Książkiewicz won the fight via a second round submssion.

After a three year hiatus, Książkiewicz returned to the cage on March 12, 2016 against Micah Brakefield. Książkiewicz won the fight via a second round TKO.

On October 19, 2016, Książkiewicz made his debut with Alaska Fighting Championship against Douglas McFresh. Książkiewicz won the fight via a first round TKO.

After a two year hiatus, Książkiewicz returned on August 2, 2018 against Jo Vallée under the promotion TKO Major League. Książkiewicz won the fight via a third round submission.

After a year off, Książkiewicz returned on November 9, 2019 against Guilherme Miranda under the promotion Teofista. Książkiewicz won the fight via a first round submission.

Dana White's Contender Series On November 10, 2020, Książkiewicz faced Mário Sousa in the fourth season of Dana White's Contender Series. Książkiewicz lost the fight via Unanimous Decision.

Unified MMA Super Middleweight champion On December 17, 2021, Książkiewicz faced Graham Park for Park's Unified MMA Super Middleweight championship. Książkiewicz won the fight via a first round TKO, and thus claimed his first career championship.

Legacy Fighting Alliance Książkiewicz made his debut with Legacy Fighting Alliance on April 22, 2022 in the main event of LFA 130 against Alessandro Gambulino. Książkiewicz won the fight via a first round TKO.

Return to Unified MMA Książkiewicz returned to Unified MMA on May 27, 2022 against Eli Aronov. Książkiewicz lost the fight via a second round submission.

Ignite Fights Light Heavyweight champion After a two year hiatus, Książkiewicz returned against Rafael Carvalho on April 13, 2024 for the vacant Ignite Fights Light Heavyweight championship. Książkiewicz won the fight via a fourth round TKO, and thus claimed his second career championship.

Konfrontacja Sztuk Walki On July 3, 2025, Książkiewicz signed with Polish promotion, Konfrontacja Sztuk Walki (KSW). He made his debut two months later on September 20 against Sergiusz Zając. Książkiewicz lost due to a knee injury in the first round.

Personal life Książkiewicz has two daughters, Paulina and Elżbieta. On April 2, 2025, news surfaced that Książkiewicz was attacked and stabbed in the heart while going to throw out the garbage by an unknown assailant. Książkiewicz put pressure on the wound, and drove himself to the hospital.

Championships and accomplishments Mixed martial arts Unified MMA Unified MMA Super Middleweight champion (One time; former) Ignite Fights Ignite Fights Light Heavyweight champion (One time; former)

Mixed martial arts record Loss

Sergiusz Zając TKO (knee injury) KSW 110

Rzeszów, Poland Win

Rafael Carvalho KO (punches) Ignite Fights: Iowa Fight Series 2

Marshalltown, Iowa, United States Loss

Eli Aronov Submission (arm-triangle choke) Unified MMA 45

Enoch, Alberta, Canada Win

Alessandro Gambulino TKO (knee to the body and punches) LFA 130

New Town, North Dakota, United States Win

Graham Park TKO (punches) Unified MMA 42

Enoch, Alberta, Canada Loss

Mário Sousa Decision (unanimous) Dana White's Contender Series 35

Las Vegas, Nevada, United States Win

Guilherme Miranda Submission (rear-naked choke) Teofista: Fight For The Troops

Brandon, Manitoba, Canada Win

Jo Vallée Submission (rear-naked choke) TKO Fight Night 1

Montreal, Quebec, Canada Win

Douglas McFresh TKO (elbows) Alaska FC 126

Anchorage, Alaska, United States Win

Micah Brakefield TKO (doctor stoppage) Prestige FC 2

Regina, Saskatchewan, Canada Win

Steve Dubeck Submission (rear-naked choke) KOTC: Out Cold

Cold Lake, Alberta, Canada Win

Ash Mashreghi Submission (rear-naked choke) Aggression FC 16

Winnipeg, Manitoba, Canada Win

Dejan Kajić Decision (unanimous) Aggression FC 11

Winnipeg, Manitoba, Canada Win

Henry Rowsell Submission (rear-naked choke) Cage Fighting Manitoba 2

Winnipeg, Manitoba, Canada