Mateusz Rębecki has four losses against four opponents on his MMA record. For a list of Rębecki's best fights, refer to "Best fights of Mateusz Rębecki".
On October 25, 2025 Mateusz Rębecki faced off against Ľudovít Klein in a lightweight bout at age 33. He was coming in with a record of 20-4 (16), and Klein was 30 years old and with a record of 23-5-1 (17). Rębecki lost the fight via 3-round majority decision.
On August 2, 2025 Mateusz Rębecki faced off against Chris Duncan in a lightweight bout at age 32. He was coming in with a record of 20-3 (16), and Duncan was 32 years old and with a record of 13-2 (9). Rębecki lost the fight via 3-round unanimous decision.
On May 11, 2024 Mateusz Rębecki faced off against Carlos Diego Ferreira in a lightweight bout at age 31. He was coming in with a record of 19-2 (16), and Ferreira was 39 years old and with a record of 18-5 (11). Rębecki lost the fight via 3rd-round TKO.
On September 20, 2014 Mateusz Rębecki faced off against Paweł Kiełek in a lightweight bout at age 21. He was coming in with a record of 3-1 (3). Rębecki lost the fight via 2nd-round KO.
