Here is a list of Klein's best fights. For a list of Klein's losses, refer to "Ľudovít Klein Losses".
On September 27, 2020 Ľudovít Klein faced off against Shane Young in a lightweight bout at age 25. He was coming in with a record of 17-2 (16), and Young was 27 years old and with a record of 13-4 (9). Klein stopped Shane Young via KO.
On June 8, 2024 Ľudovít Klein faced off against Thiago Moisés in a lightweight bout at age 29. He was coming in with a record of 22-4-1 (17), and Moisés was 29 years old and with a record of 18-7 (12). Klein won the fight via 3-round unanimous decision.
On March 2, 2024 Ľudovít Klein faced off against AJ Cunningham in a lightweight bout at age 29. He was coming in with a record of 21-4-1 (17). Klein stopped AJ Cunningham via TKO.
On July 23, 2022 Ľudovít Klein faced off against Mason Jones in a lightweight bout at age 27. He was coming in with a record of 19-4 (16), and Jones was 27 years old and with a record of 11-1 (7). Klein won the fight via 3-round unanimous decision.
On August 5, 2023 Ľudovít Klein faced off against Ignacio Bahamondes in a lightweight bout at age 28. He was coming in with a record of 20-4-1 (16), and Bahamondes was 25 years old and with a record of 14-4 (10). Klein won the fight via 3-round unanimous decision.
On October 25, 2025 Ľudovít Klein faced off against Mateusz Rębecki in a lightweight bout at age 30. He was coming in with a record of 24-5-1 (17), and Rębecki was 33 years old and with a record of 20-3 (16). Klein won the fight via 3-round majority decision.
On September 28, 2024 Ľudovít Klein faced off against Roosevelt Roberts in a lightweight bout at age 29. He was coming in with a record of 23-4-1 (17), and Roberts was 30 years old and with a record of 12-4 (9). Klein won the fight via 3-round unanimous decision.
On March 5, 2022 Ľudovít Klein faced off against Devonte Smith in a lightweight bout at age 27. He was coming in with a record of 18-4 (16), and Smith was 28 years old and with a record of 11-3 (11). Klein won the fight via 3-round split decision.
On April 1, 2017 Ľudovít Klein faced off against Khusein Maltsagov in a featherweight bout at age 22. He was coming in with a record of 7-1 (7). Klein stopped Khusein Maltsagov via KO.
