Zhan Kossobutskiy has one loss against one opponent on his boxing record. For a list of Kossobutskiy's best fights, refer to "Best fights of Zhan Kossobutskiy".
On August 26, 2023 Zhan Kossobutskiy faced off against Efe Ajagba in a heavyweight bout at age 34. He was coming in with a record of 19-1 (18), and Ajagba was 29 years old and with a record of 17-1 (13). Kossobutskiy lost the fight via 4-round disqualification.