Bartosz Leśko

Bartosz Leśko (born 28 April 1996) is a Polish professional mixed martial artist. He is the current KSW Light Heavyweight champion. He has previously competed on Absolute Championship Akhmat (ACA) and Fight Exclusive Night (FEN MMA).

Professional career Early career Leśko made his professional debut on January 17, 2015, against Marek Michaluk. Leśko won the fight via a first-round submission.

His next fight came on October 24, 2015, against Mikołaj Dziąbor. Leśko won the fight via a first-round TKO.

His next fight came on December 19, 2015, against Robert Maciejowski. The bout ended in a Majority Draw.

Time of Masters Leśko returned to Time of Masters, the federation which he made his professional debut under, on March 12, 2016, against Tomasz Kubczak. Leśko won the fight via a second-round TKO.

His next fight came on November 19, 2016, against Maciej Szydłowski. Leśko won the fight via a first-round submission.

Fight Exclusive Night Leśko made his debut under Fight Exclusive Night (FEN MMA) on May 12, 2017, against Aleksander Rychlik. Leśko won the fight via a second-round submission. This performance earned him his first career Submission of the Night bonus.

His next fight came on October 14, 2017, against Paweł Brandys. Leśko won the fight via a Unanimous Decision.

His next fight came on March 10, 2018, against Marcin Naruszczka. Leśko lost the fight via a Unanimous Decision, suffering his first career defeat in the process.

His next fight came on May 25, 2018 against Kevin Wiwatowski. Leśko won the fight via a first-round submission.

His next fight came on October 20, 2018, against Tomasz Kondraciuk. Leśko won the fight via a first-round submission. This performance earned him his second career Submission of the Night bonus.

His next fight came on March 16, 2019, in a rematch against Marcin Naruszczka. The bout ended in a Split Draw.

His final fight with the federation came on June 15, 2019, in a rematch against Kevin Wiwatowski. Leśko won the fight via a first-round submission.

Absolute Championship Akhmat Leśko made his debut under Russian federation Absolute Championship Akhmat on November 26, 2020, against Rene Pessoa. Leśko won the fight via a Unanimous Decision.

His next fight came on September 11, 2021, against Ibragim Magomedov. Leśko won the fight via a first-round disqualification, after Magomedov landed an illegal knee.

His final fight with the federation came on December 17, 2021, against Khusein Kushagov. Leśko lost the fight via a second-round knockout.

Konfrontacja Sztuk Walki On May 11, 2022, it was announced that Leśko had signed a contract with Konfrontacja Sztuk Walki (KSW).

His first fight with the federation came two weeks later on May 28, against Damian Piwowarczyk. Leśko won the fight via a Unanimous Decision.

His next fight came on March 17, 2023, against Tom Breese. Leśko lost the fight via a first-round submission.

His next fight came on July 15, 2023, against Nemanja Nikolić. Leśko won the fight via a first-round submission. This performance earned him his third career Submission of the Night bonus.

His next fight came on November 11, 2023, against Piotr Kuberski. Leśko lost the fight via a third-round TKO.

His next fight came on May 11, 2024, against Michał Michalski. Leśko lost the fight via a first-round TKO.

His next fight came on September 14, 2024, against Dominik Humburger, stepping in on fight night for a medically uncleared Bogdan Gnidko. Leśko won the fight via a Unanimous Decision. This performance earned him his first Performance of the Night bonus.

His next fight came on March 8, 2025, against Maciej Różański. Leśko won the fight via a Unanimous Decision.

Leśko faced Rafał Haratyk for Haratyk's KSW Light Heavyweight Championship on October 18, 2025. Leśko lost the fight via a Unanimous Decision, thus failing to capture the championship.

His next fight came on March 14, 2026, against Bartosz Szewczyk. Leśko won the fight via a Unanimous Decision.

KSW Light Heavyweight Champion Leśko faced Rafał Haratyk in a rematch for Haratyk's KSW Light Heavyweight Championship on July 18, 2026. Leśko won the fight via a Unanimous Decision, winning his first career championship in the process. This performance earned him his first Fight of the Night bonus.

Championships and accomplishments Mixed martial arts Konfrontacja Sztuk Walki KSW Light Heavyweight Championship (One time; current) Fight of the Night (One time) Performance of the Night (One time) Submission of the Night (One time) Fight Exclusive Night Submission of the Night (Two times)

Mixed martial arts record Win

Rafał Haratyk Decision (unanimous) KSW 120

Gdynia, Poland Win

Bartosz Szewczyk Decision (unanimous) KSW 116

Gorzów Wielkopolski, Poland Loss

Rafał Haratyk Decision (unanimous) KSW 111

Třinec, Czech Republic Win

Maciej Różański Decision (unanimous) KSW 104

Gorzów Wielkopolski, Poland Win

Dominik Humburger Decision (unanimous) KSW 98

Lubin, Poland Loss

Michał Michalski TKO (punches) KSW 94

Gdańsk, Poland Loss

Piotr Kuberski KO (punches) KSW 88

Radom, Poland Win

Nemanja Nikolić Submission (rear-naked choke) KSW 84

Gdynia, Poland Loss

Tom Breese Submission (rear-naked choke) KSW 80

Lubin, Poland Win

Damian Piwowarczyk Decision (unanimous) KSW 70

Łódź, Poland Loss

Khusein Kushagov KO (punch) ACA 134

Krasnodar, Russia Win

Ibragim Magomedov DQ (illegal knee) ACA 128

Minsk, Belarus Win

Rene Pessoa Decision (unanimous) ACA 114

Łódź, Poland Win

Kevin Wiwatowski Submission (rear-naked choke) Fight Exclusive Night 25

Ostróda, Poland Draw

Marcin Naruszczka Draw (split) Fight Exclusive Night 24

Warsaw, Poland Win

Tomasz Kondraciuk Submission (rear-naked choke) Fight Exclusive Night 22

Poznań, Poland Win

Kevin Wiwatowski Submission (rear-naked choke) Fight Exclusive Night 21

Wrocław, Poland Loss

Marcin Naruszczka Decision (unanimous) Fight Exclusive Night 20

Warsaw, Poland Win

Paweł Brandys Decision (unanimous) Fight Exclusive Night 19

Wrocław, Poland Win

Aleksander Rychlik Submission (rear-naked choke) Fight Exclusive Night 18

Gdynia, Poland Win

Maciej Szydłowski Submission (rear-naked choke) Time of Masters: Siemmce Fight Night

Siemianowice Śląskie, Poland Win

Tomasz Kubczak TKO (punches) Time of Masters 2

Sopot, Poland Draw

Robert Maciejowski Draw (majority) MMA Fight Night 4

Kołczewo, Poland Win

Mikołaj Dziąbor TKO (punches) Incredible Fighting Night 1

Częstochowa, Poland Win

Marek Michaluk Submission (rear-naked choke) Time of Masters 1

Sopot, Poland