Ľudovít Klein has five losses against five opponents on his MMA record. For a list of Klein's best fights, refer to "Best fights of Ľudovít Klein".
On May 31, 2025 Ľudovít Klein faced off against Mateusz Gamrot in a lightweight bout at age 30. He was coming in with a record of 23-5-1 (17), and Gamrot was 34 years old and with a record of 24-3 (13). Klein lost the fight via 3-round unanimous decision.
On October 16, 2021 Ľudovít Klein faced off against Nate Landwehr in a lightweight bout at age 26. He was coming in with a record of 17-4 (16), and Landwehr was 33 years old and with a record of 14-4 (8). Klein lost the fight via 3rd-round submission.
On May 8, 2021 Ľudovít Klein faced off against Michael Trizano in a lightweight bout at age 26. He was coming in with a record of 17-3 (16). Klein lost the fight via 3-round unanimous decision.
On October 14, 2017 Ľudovít Klein faced off against Aiden Lee in a featherweight bout at age 22. He was coming in with a record of 9-2 (9). Klein lost the fight via 1st-round submission.
On February 24, 2017 Ľudovít Klein faced off against Igor Tarytsa in a featherweight bout at age 22. He was coming in with a record of 6-1 (6). Klein lost the fight via 1st-round KO.