On December 10, 2023, a 36-year-old Mateusz Masternak (47-5, 31 KOs) got a shot at the cruiserweight WBO title held by 33-year-old English boxer Chris Billam-Smith (18-1, 12 KOs).
Masternak came in to the fight on a 6-fight win streak with a 59% KO rate, and was fighting after a gap of 1 year, 1 month, and 11 days. Billam-Smith was on a 9-fight win streak with a 63% KO rate, and fighting after a layoff of 6 months and 13 days.
The challenger refused to continue the fight in the 8th round, and Chris Billam-Smith is crowned the new cruiserweight world champion. Billam-Smith improves his record to 19-1 (13 KOs), while Masternak adds a loss to his record at 47-6.
On October 20, 2018, a 31-year-old Mateusz Masternak (41-4, 28 KOs) and a 32-year-old Cuban boxer Yuniel Dorticos (22-1, 21 KOs) met in the ring.
Masternak came in to the fight on a 5-fight win streak with a 62% KO rate, and was fighting after a gap of 5 months and 29 days. Dorticos was on a -1-fight win streak with a 91% KO rate, and fighting after a layoff of 8 months and 17 days.
Yuniel Dorticos defeated Mateusz Masternak via unanimous decision in the 12-round fight. Dorticos improves his record to 23-1, while Masternak adds a loss to his record at 41-5.
On December 12, 2015, a 28-year-old Mateusz Masternak (36-3, 26 KOs) and a 33-year-old British boxer Tony Bellew (25-2-1, 16 KOs) met in the ring in a cruiserweight bout.
Masternak came in to the fight on a 1-fight win streak with a 66% KO rate, and was fighting after a gap of 3 months and 7 days. Bellew was on a 5-fight win streak with a 57% KO rate, and fighting after a layoff of 3 months and 7 days.
Tony Bellew defeated Mateusz Masternak via unanimous decision in the 12-round cruiserweight fight. Bellew improves his record to 26-2-1, while Masternak adds a loss to his record at 36-4.
On June 6, 2015, a 28-year-old Mateusz Masternak (35-2, 25 KOs) and Johnny Muller met in the ring.
Masternak came in to the fight on a 3-fight win streak with a 67% KO rate, and was fighting after a gap of 1 month and 12 days.
Mateusz Masternak lost to Johnny Muller via split decision in the 10-round fight, and adds a loss to his record at 35-3.
On June 21, 2014, a 27-year-old Mateusz Masternak (32-1, 23 KOs) and Youri Kayembre Kalenga met in the ring in a cruiserweight bout.
Masternak came in to the fight on a 2-fight win streak with a 69% KO rate, and was fighting after a gap of 2 months and 9 days.
Mateusz Masternak lost to Youri Kayembre Kalenga via split decision in the 12-round cruiserweight fight, and adds a loss to his record at 32-2.
On October 5, 2013, a 26-year-old Mateusz Masternak (30-0, 22 KOs) and Grigory Drozd met in the ring in a cruiserweight bout.
Masternak came in to the fight on a 30-fight win streak with a 73% KO rate, and was fighting after a gap of 5 months and 22 days.
Mateusz Masternak lost to Grigory Drozd via TKO in the 11th round, and adds a loss to his record at 30-1.