Bartosz Leśko Record, stats and next fight

Analysis

Bartosz Leśko became KSW light heavyweight champion in July 2026, avenging an earlier loss to Rafał Haratyk nine months later. The fighter from Gdynia holds a professional record of 17 wins, 6 losses and 2 draws, marked by seven wins by rear-naked choke.

Background

Born April 28, 1996, Bartosz Leśko trains with the Mighty Bulls Gdynia club, where he developed a ground game centered on the rear-naked choke. He made his professional debut in January 2015 at Time of Masters 1, submitting Marek Michaluk, before stringing together several wins in the Polish Time of Masters and Fight Exclusive Network circuits. His progress hit a first setback in March 2018 against Marcin Naruszczka, followed by a draw against the same opponent a year later. He bounced back with two submission wins over Tomasz Kondraciuk and Kevin Wiwatowski, before joining the Russian ACA circuit in 2020, where he beat Rene Pessoa by decision and Ibragim Magomedov by disqualification, before losing by KO to Husein Kushagov in December 2021.

KSW Career

Leśko signed with KSW, the Polish promotion where Mamed Khalidov has competed for nearly two decades, and made his debut in May 2022 with a points win over Damian Piwowarczyk. After a submission loss to Tom Breese in March 2023, he bounced back that July by submitting Nemanja Nikolic, before losing by KO to Piotr Kuberski in November 2023 at KSW 88. He suffered another loss, by TKO against Michał Michalski in May 2024, then returned to winning ways in September 2024 against Dominik Humburger, and in March 2025 against Maciej Rozanski. In October 2025, he faced Rafał Haratyk, then light heavyweight champion, for the first time and lost by decision. He earned a rematch after a win over Bartosz Szewczyk in March 2026, and beat Haratyk by unanimous decision at KSW 120 in July 2026 to claim the title, his most recent fight.

Fighting Style

Bartosz Leśko is a grappling specialist: seven of his seventeen professional wins have come by rear-naked choke, a technique he has used in both the Polish circuits and during his time in Russia with ACA. He rounds out that skill set with seven decision wins, earned by managing distance and limiting risky exchanges over the course of a fight. At 6’2″ (189 cm) and 205 lbs (93 kg), he is a difficult opponent in the clinch, where he looks to lock in his choke once the grappling exchange begins. Like fellow Pole Jan Błachowicz, a former UFC light heavyweight champion, Leśko competes in a division where Poland has already produced recognized champions. His low total of fast finishes, only two by KO or TKO in eleven years as a pro, confirms that he consistently favors hunting a submission or managing the fight over distance rather than trading strikes at range.

Record

• Professional record of 17 wins, 6 losses and 2 draws
• 2 wins by KO or TKO
• 7 wins by submission, mostly by rear-naked choke
• 7 wins by decision
• 1 win by disqualification
• KSW light heavyweight champion since July 2026

Fighter Profile

• Full name: Bartosz Leśko
• Nickname: not disclosed
• Born: April 28, 1996
• Nationality: Polish
• Height: 6’2″ (189 cm)
• Reach: not disclosed
• Division: light heavyweight
• Team: Mighty Bulls Gdynia
• Coach: not disclosed
• Base: Brazilian jiu-jitsu, rear-naked choke

Sources

• sherdog.com
• www.kswmma.com
• cagesidepress.com