Konfrontacja Sztuk Walki He made his professional MMA debut on February 4, 2012, at XFS Night of Champions, defeating Chechen Arbi Shamayev. By the end of the year he had won two more fights for the federation and signed with
KSW. On June 8, 2013, he had his first fight in KSW, beating Mateusz Zawadzki via TKO at
KSW 23: Khalidov vs. Manhoef. On September 28 at
KSW 24 he defeated former UFC fighter
Andre Winner by unanimous decision. At
KSW 27, Mateusz defeated Jefferson George on points. On September 13, 2014, he made his promotional debut for Cage Warriors, defeating Welshman Tim Newman in the 1st round with a heel hook submission at CW 72. He returned to KSW on December 6, 2014, to defeat Łukasz Chlewicki at
KSW 29 via unanimous decision. At
KSW 30 on February 21, 2015, he defeated Brazilian Rodrigo Cavalheiro Correia by technical knockout six seconds before the final bell. Gamrot earned a Knockout of the Night bonus for his performance.
KSW Lightweight Championship On May 27, 2016, at
KSW 35, he fought for the vacant
KSW Lightweight Championship belt against former British BAMMA and Russian M-1 Global champion Frenchman
Mansour Barnaoui. He won the title via unanimous decision. Both fighters were awarded the Fight of the Night bonus. Gamrot faced former UFC fighter
Norman Parke at
KSW 39: Colosseum on May 27, 2017. He won the bout and retained the title via unanimous decision. Gamrot rematched
Norman Parke at
KSW 40: Dublin on October 22, 2017. At the weigh-ins, Parke came in one pound over the championship limit and the bout was declared a non-title bout. The bout was stopped in the second round when accidental eye pokes left Parke unable to continue. Following this Parke shoved Gamrot's cornerman, Borys Mankowski, which resulted in Marcin Bilman, another professional fighter who was in the champion's corner, punching Parke. Gamrot was subsequently fined 30% of his purse and Bilman was handed a two-year ban from KSW events. On March 3, 2018, at
KSW 42: Khalidov vs. Narkun, Gamrot defeated Grzegorz Szulakowski via keylock submission in the fourth round, defending the KSW Lightweight Championship.
Two-division champion On December 1, 2018, at
KSW 46: Narkun vs. Khalidov 2, he fought for a second belt, this time for the
KSW Featherweight Championship, against submission specialist
Kleber Koike Erbst, where he won the bout after a five-round domination, capturing the organization's second crown.
Vacating the titles On May 17, 2019, in a video on Borys Mankowski's YouTube channel, Gamrot announced that he had vacated his two belts and did not renew his contract with KSW. On March 6, 2020, KSW announced Gamrot's return to the organization. The KSW double champion was scheduled to return at
KSW 53 in Łódź, Poland against the Brazilian Edimilson Souza, but due to the coronavirus pandemic the event was canceled. On July 11 he fought his third bout at
KSW 53: Reborn against
Norman Parke. Parke missed weight for the bout and was fined, which went to Gamrot. Gamrot won the fight in the third round via technical knockout. On August 29, 2020, he fought for the last time under his KSW contract against Marian Ziółkowski at
KSW 54: Gamrot vs. Ziółkowski, who replaced the injured Shamil Musayev. After a 5-round bout, Gamrot won via unanimous decision.
Ultimate Fighting Championship 2020 On September 17, 2020, it was announced that Gamrot signed with the
Ultimate Fighting Championship. Gamrot, as a replacement for
Renato Moicano, was scheduled to face
Magomed Mustafaev at
UFC Fight Night: Ortega vs. The Korean Zombie on October 18, 2020. In turn, Mustafaev pulled out in early October due to undisclosed reasons. Gamrot faced fellow promotional newcomer Guram Kutateladze instead. He lost the close fight via split decision. Both fighters earned the
Fight of the Night award.
2021 Gamrot faced
Scott Holtzman on April 10, 2021, at
UFC on ABC: Vettori vs. Holland. He won the fight via knockout in the second round. This win earned him the
Performance of the Night award. Gamrot faced
Jeremy Stephens on July 17, 2021, at
UFC on ESPN: Makhachev vs. Moisés. He won the fight via
kimura in round one, this submission is the quickest of its kind in UFC history. This win earned him the
Performance of the Night award. As the first bout of his new four-fight contract, Gamrot faced
Carlos Diego Ferreira on December 18, 2021, at
UFC Fight Night: Lewis vs. Daukaus. He won the bout via TKO in round two, forcing Ferreira to submit with a knee to the body.
2022 Gamrot faced
Arman Tsarukyan on June 25, 2022, at
UFC on ESPN 38. He won the closely contested fight via unanimous decision. 15 of 22 MMA media outlets scored the bout in favor of Tsarukyan. Both fighters earned the
Fight of the Night award. As the first fight of his four-fight contract, Gamrot faced
Beneil Dariush on October 22, 2022, at
UFC 280. He lost the fight by unanimous decision.
2023 Gamrot, replacing
Dan Hooker, faced
Jalin Turner on March 4, 2023, at
UFC 285. In a closely contested bout where Gamrot employed his wrestling to combat Turner’s reach advantage, he won the bout via split decision. Gamrot faced
Rafael Fiziev on September 23, 2023, at
UFC Fight Night 228 He won the fight via technical knockout due to knee injury in round two. In October 2023, Gamrot served as the backup fighter for the main event of
UFC 294.
2024 Gamrot faced
Rafael dos Anjos on March 9, 2024, at
UFC 299. He won the bout by unanimous decision. Gamrot faced
Dan Hooker on August 17, 2024 at
UFC 305. He lost the fight by split decision. 9 out of 16 media outlets scored the bout for Gamrot. This fight earned him another
Fight of the Night award.
2025 Gamrot was reportedly going to face
Rafael Fiziev in a rematch on February 1, 2025 at
UFC Fight Night 250. However, the bout was never officially scheduled for the event. Gamrot faced
Ľudovít Klein on May 31, 2025, at
UFC on ESPN 68. Gamrot lost the fight via a face crank submission in the second round, resulting in his first defeat by finish.
2026 Gamrot faced
Esteban Ribovics on April 11, 2026, at
UFC 327. He won the fight via an arm-triangle choke submission in the second round. ==Submission grappling career==