Callum Simpson losses
Over 6 years as a professional, Callum Simpson has compiled a 17-1 (12) record, including six title fights. His only loss came in a title fight against Troy Williamson.
1. Callum Simpson loses to Troy Williamson via KO
On December 20, 2025 Callum Simpson defended his BBBofC British, Commonwealth Boxing Council, and EBU European super middleweight titles against Troy Williamson. Simpson was 29 years old with a record of 17-0, and Williamson was 34 with a record of 21-4-1. Simpson was on an undefeated 17-fight winning streak and Williamson was coming off a win. Williamson stopped Simpson via TKO in the 10th round. Lost the titles. Lasted into the 10th round.