Here is a list of Balzsay's best fights. For a list of Balzsay's losses, refer to "Károly Balzsay Losses".
On April 25, 2009 Károly Balzsay met Maselino Masoe in a super-middleweight (WBO) world-title defense fight. Balzsay was 29 years old and with a record of 21-0 (15), and Masoe was 42 years old and with a record of 29-5 (27). Balzsay stopped Maselino Masoe via 11th-round KO and successfully defended his title.