On April 25, 2009, the 29-year-old WBO super-middleweight world champion, Károly Balzsay (20-0, 14 KOs), faced a 42-year-old American boxer Maselino Masoe (29-5, 27 KOs), in a title defense fight.
Balzsay came in to the fight on a 20-fight win streak with a 70% KO rate, and was fighting after a gap of 3 months and 15 days. Masoe was on a 2-fight win streak with a 79% KO rate, and fighting after a layoff of 5 months and 17 days.
Károly Balzsay stopped Maselino Masoe via KO in the 11th round of the 12-round world-title fight, and successfully defended his WBO super-middleweight title. Balzsay improves his record to 21-0 (15 KOs), while Masoe adds a loss to his record at 29-6.
On April 21, 2012, the 32-year-old WBA (Regular) super-middleweight world champion, Károly Balzsay (24-2, 17 KOs), faced Dimitri Sartison, in a title defense fight.
Balzsay came in to the fight on a 3-fight win streak with a 65% KO rate, and was fighting after a gap of 7 months and 26 days.
Károly Balzsay stopped Dimitri Sartison via TKO in the final round of the 12-round world-title fight, and successfully defended his WBA (Regular) super-middleweight title. Balzsay improves his record to 25-2 (18 KOs)
On January 10, 2009, a 29-year-old Károly Balzsay (19-0, 14 KOs) got a shot at the WBO super-middleweight title held by Denis Inkin.
Balzsay came in to the fight on a 19-fight win streak with a 73% KO rate, and was fighting after a gap of 5 months and 16 days.
Károly Balzsay defeated Denis Inkin via unanimous decision and wins the WBO title — in his first world-title fight. Balzsay improves his record to 20-0
On August 26, 2011, 32-year-old Károly Balzsay (23-2, 17 KOs) and Stanyslav Kashtanov fought for the vacant WBA (Regular) super-middleweight title.
Balzsay came in to the fight on a 2-fight win streak with a 68% KO rate, and was fighting after a gap of 9 months and 7 days.
Károly Balzsay defeated Stanyslav Kashtanov via split decision . Balzsay improves his record to 24-2
On May 6, 2006, a 26-year-old Károly Balzsay (11-0, 7 KOs) and Maneno Oswald met in the ring.
Balzsay came in to the fight on a 11-fight win streak with a 63% KO rate, and was fighting after a gap of 3 months and 2 days.
Károly Balzsay stopped Maneno Oswald via KO in the 1st round. Balzsay improves his record to 12-0 (8 KOs)
On January 27, 2007, a 27-year-old Károly Balzsay (14-0, 10 KOs) and Soon Botes met in the ring.
Balzsay came in to the fight on a 14-fight win streak with a 71% KO rate, and was fighting after a gap of 2 months and 6 days.
Károly Balzsay stopped Soon Botes via KO in the 2nd round. Balzsay improves his record to 15-0 (11 KOs)
On November 21, 2006, a 27-year-old Károly Balzsay (13-0, 9 KOs) and Michal Bilak met in the ring.
Balzsay came in to the fight on a 13-fight win streak with a 69% KO rate, and was fighting after a gap of 2 months and 12 days.
Károly Balzsay stopped Michal Bilak via TKO in the 2nd round. Balzsay improves his record to 14-0 (10 KOs)
On July 2, 2005, a 25-year-old Károly Balzsay (7-0, 5 KOs) and Youssef Temsoury met in the ring.
Balzsay came in to the fight on a 7-fight win streak with a 71% KO rate, and was fighting after a gap of 1 month and 25 days.
Károly Balzsay stopped Youssef Temsoury via TKO in the 2nd round. Balzsay improves his record to 8-0 (6 KOs)
On April 16, 2005, a 25-year-old Károly Balzsay (5-0, 4 KOs) and Willie McDonald met in the ring.
Balzsay came in to the fight on a 5-fight win streak with a 80% KO rate, and was fighting after a gap of 21 days.
Károly Balzsay stopped Willie McDonald via TKO in the 2nd round. Balzsay improves his record to 6-0 (5 KOs)
On March 26, 2005, a 25-year-old Károly Balzsay (4-0, 3 KOs) and Danny De Beul met in the ring.
Balzsay came in to the fight on a 4-fight win streak with a 75% KO rate, and was fighting after a gap of 1 month.
Károly Balzsay stopped Danny De Beul via KO in the 2nd round. Balzsay improves his record to 5-0 (4 KOs)