Dariusz Michalczewski has two losses against two opponents on his boxing record. For a list of Michalczewski's best fights, refer to "Best fights of Dariusz Michalczewski".
On February 26, 2005 Dariusz Michalczewski fought Fabrice Tiozzo in a light-heavyweight world-title fight for Tiozzo's WBA title. Michalczewski was 36 years old and with a record of 48-2 (38), and Tiozzo was 35 years old and with a record of 46-2 (30). Michalczewski lost the fight via 6th-round TKO.
On October 18, 2003 Dariusz Michalczewski met Julio César González in a light-heavyweight (WBO) world-title defense fight. Michalczewski was 35 years old and with a record of 48-1 (38), and González was 27 years old and with a record of 34-1 (22). Michalczewski lost the fight via 12-round split decision and lost the title.