Denis Lebedev has three losses against three opponents on his boxing record. For a list of Lebedev's best fights, refer to "Best fights of Denis Lebedev".
On December 21, 2019 Denis Lebedev faced off against Thabiso Mchunu in a cruiserweight bout at age 40. He was coming in with a record of 32-3 (23), and Mchunu was 31 years old and with a record of 21-5 (13). Lebedev lost the fight via 12-round unanimous decision.
On December 3, 2016 Denis Lebedev met Murat Gassiev in a cruiserweight (IBF) world-title defense fight. Lebedev was 37 years old and with a record of 29-2 (22), and Gassiev was 23 years old and with a record of 23-0 (17). Lebedev lost the fight via 12-round split decision and lost the title.
On December 18, 2010 Denis Lebedev fought Marco Huck in a cruiserweight world-title fight for Huck's WBO title. Lebedev was 31 years old and with a record of 21-1 (16), and Huck was 26 years old and with a record of 30-1 (23). Lebedev lost the fight via 12-round split decision.