Here is a list of Oleksiejczuk's best fights. For a list of Oleksiejczuk's losses, refer to "Michał Oleksiejczuk Losses".
On October 30, 2021 Michał Oleksiejczuk faced off against Shamil Gamzatov in a light-heavyweight bout at age 26. He was coming in with a record of 16-4 (12), and Gamzatov was 31 years old and with a record of 14-0 (10). Oleksiejczuk stopped Shamil Gamzatov via TKO.
On December 17, 2022 Michał Oleksiejczuk faced off against Cody Brundage in a middleweight bout at age 27. He was coming in with a record of 18-5 (14), and Brundage was 28 years old and with a record of 8-2 (7). Oleksiejczuk stopped Cody Brundage via KO.
On April 20, 2019 Michał Oleksiejczuk faced off against Gadzhimurad Antigulov in a light-heavyweight bout at age 24. He was coming in with a record of 14-2 (11), and Antigulov was 32 years old and with a record of 20-5 (19). Oleksiejczuk stopped Gadzhimurad Antigulov via KO.
On August 16, 2025 Michał Oleksiejczuk faced off against Gerald Meerschaert in a middleweight bout at age 30. He was coming in with a record of 21-9 (17), and Meerschaert was 37 years old and with a record of 37-19 (31). Oleksiejczuk stopped Gerald Meerschaert via TKO.
On August 26, 2023 Michał Oleksiejczuk faced off against Chidi Njokuani in a middleweight bout at age 28. He was coming in with a record of 19-6 (15), and Njokuani was 34 years old and with a record of 22-9 (15). Oleksiejczuk stopped Chidi Njokuani via TKO.
On August 6, 2022 Michał Oleksiejczuk faced off against Sam Alvey in a middleweight bout at age 27. He was coming in with a record of 17-5 (13), and Alvey was 36 years old and with a record of 33-17-1 (22). Oleksiejczuk stopped Sam Alvey via TKO.
On February 23, 2019 Michał Oleksiejczuk faced off against Gian Villante in a light-heavyweight bout at age 24. He was coming in with a record of 13-2 (10), and Villante was 33 years old and with a record of 17-10 (12). Oleksiejczuk stopped Gian Villante via TKO.
On April 12, 2025 Michał Oleksiejczuk faced off against Sedriques Dumas in a middleweight bout at age 30. He was coming in with a record of 20-9 (16). Oleksiejczuk stopped Sedriques Dumas via TKO.
On March 27, 2021 Michał Oleksiejczuk faced off against Modestas Bukauskas in a light-heavyweight bout at age 26. He was coming in with a record of 15-4 (11), and Bukauskas was 27 years old and with a record of 11-3 (9). Oleksiejczuk won the fight via 3-round split decision.
On January 11, 2014 Michał Oleksiejczuk faced off against Rajmund Flejmer in a middleweight bout at age 18. He was coming in with a record of 1-0 (0). Oleksiejczuk won the fight via 2-round unanimous decision.
