Adrian Bartosiński

Adrian Bartosiński (born August 25, 1995) is a Polish professional mixed martial artist. He currently competes in the Welterweight division for Konfrontacja Sztuk Walki. He is the current KSW Welterweight Champion.

Professional career Early career Before his professional career, he fought as an amateur. In his last bout, he defeated Michał Pach by a split decision at the TFL 12: Hydro Truck Night event.

His first professional fight came four months later, against Wojciech Żuchnik. Bartosiński won again by unanimous decision.

After a half-year hiatus, he would return in a bout against Jarosław Lech. Bartosiński would win via TKO in the second round.

He would return seven months later against Ukraine's Vladislav Schepanskyi. He would defeat the latter via a Doctor Stoppage in the first round.

Three months later, he would return in a bout against Russia's Alexander Shingarenko. Bartosiński would win via a first-round TKO.

Fight Exclusive Night Three months later, Bartosiński would fight under Poland's second biggest promotion, Fight Exclusive Night. He fought Krystian Bielski. Bartosiński would win via TKO, and also earn himself a Knockout of the Night bonus.

Return to regional circuit Two months later, he would return to take on Ukraine's Konstantin Linnik in his home town of Rawa Mazowiecka. Bartosiński would win via a first-round TKO.

Konfrontacja Sztuk Walki Tylko Jeden Adrian would compete in the Tylko Jeden tournament. He would compete for a contract with Konfrontacja Sztuk Walki. In the first round, he faced Kamil Dołgowski, whom he would beat via a Doctor Stoppage in the first round.

His next fight in the tournament would be against Piotr Walawski. Bartosiński would win via a third-round TKO, and thus advancing to the finals.

Bartosiński was set to face Tomasz Romanowski in the final, however he would suffer an injury, and was forced to withdraw from the tournament.

Main Roster Despite not winning the tournament, Bartosiński would still eventually sign with the promotion. His first fight came almost a year later, when he took on Spain's Lionel Padilla. Bartosiński would win via a third-round TKO.

His next fight would come four months later, where he took on fellow countryman, Michał Michalski. He would beat Michalski via a first-round TKO.

After over half a year out, he would return against Andrzej Grzebyk. Bartosiński would win via submission for the first time in his career. This performance would earn him a Submission of the Night bonus.

After a nine-month hiatus, he would return to the cage against Krystian Kaszubowski. Bartosiński would win via a first-round TKO.

KSW Welterweight Champion Five months later, he would face Artur Szczepaniak for the vacant KSW Welterweight Championship. Bartosiński would win the fight via a first-round TKO, and thus claiming his first career championship. In the process, he also received a Knockout of the Night bonus.

His first title defense would come eight months later, when he took on France's Salahdine Parnasse. Parnasse was also the current Featherweight and Lightweight champion. Bartosiński would win the fight via Unanimous Decision.

His next title defense came five months later. Bartosiński was originally scheduled to face Andrzej Grzebyk in a rematch, however Grzebyk pulled out due to injury. He would end up facing Igor Michaliszyn, whom he would beat via submission in the third round.

His next fight was not a title fight. He would face veteran fighter Mamed Khalidov half a year later. Khalidov would win via submission in the second round, and in the process handing Bartosiński his first career loss.

Five months later, he would face Andrzej Grzebyk in a rematch. This time the fight being for the title. Bartosiński would win via a Unanimous Decision in what is claimed by many to be the greatest fight in the organization. Bartosiński would also earn himself a Fight of the Night bonus.

Following an eight month hiatus after sustaining an injury in his last fight, his fourth title defense came on December 20, 2025, against Muslim Tulshaev. Bartosiński won the fight via a third-round TKO. This fight earned him his second Fight of the Night bonus.

His next title defense came on March 14, 2026, against Madars Fleminas. Bartosiński won the fight via a controversial Split Decision, defending his title successfully for the fifth time.

Championships and accomplishments Konfrontacja Sztuk Walki KSW Welterweight Championship (One time; current) Five successful title defenses Fight of the Night (Two times) Knockout of the Night (One time) Submission of the Night (One time) Fight Exclusive Night Knockout of the Night (One time)

Mixed martial arts record Win

Madars Fleminas Decision (split) KSW 116

Gorzów Wielkopolski, Poland Win

Muslim Tulshaev TKO (elbows) KSW 113

Łódź, Poland Win

Andrzej Grzebyk Decision (unanimous) KSW 105

Gliwice, Poland Loss

Mamed Khalidov Submission (armbar) KSW 100

Gliwice, Poland Win

Igor Michaliszyn Submission (kneebar) KSW 94

Gdańsk, Poland Win

Salahdine Parnasse Decision (unanimous) KSW 89

Gliwice, Poland Win

Artur Szczepaniak TKO (punches) KSW 81

Tomaszów Mazowiecki, Poland Win

Krystian Kaszubowski TKO (elbows and punches) KSW 76

Grodzisk Mazowiecki, Poland Win

Andrzej Grzebyk Submission (kneebar) KSW 67

Warsaw, Poland Win

Michał Michalski TKO (punches) KSW 62

Warsaw, Poland Win

Lionel Padilla TKO (punches) KSW 59

Łódź, Poland Win

Piotr Walawski TKO (punch) KSW Tylko Jeden: Episode 6

Warsaw, Poland Win

Kamil Dołgowski TKO (doctor stoppage) KSW Tylko Jeden: Episode 3

Warsaw, Poland Win

Konstantin Linnik TKO (elbows) Wirtuoz Challenge: Rawa Mazowiecka Fight Night

Rawa Mazowiecka, Poland Win

Krystian Bielski TKO (punches) Fight Exclusive Night 26

Wrocław, Poland Win

Alexander Shingarenko TKO (punches) Rocky Warriors Cartel 3

Gdynia, Poland Win

Vladislav Schepanskyi TKO (doctor stoppage) Wirtuoz Challenge 2

Wolbórz, Poland Win

Jarosław Lech TKO (punches) Wirtuoz Challenge 1

Wolbórz, Poland Win

Wojciech Żuchnik Decision (unanimous) Thunderstrike Fight League 13

Lublin, Poland