[1] In an amateur career which he claims began at age nine, Williams says he won 44 out of 49 fights, gaining many awards in Britain and Europe.
[4] The following year, he added the vacant British national title by stopping Kris Carslaw in the second round of their bout at Manchester Arena.
[5] He retained both titles in defeating a previously unbeaten Gary Corcoran at the Ice Arena Wales on 16 July 2016 with an 11th-round stoppage in what has been described as a gruesome grudge match.
[11][12] On 17 April 2021, Williams unsuccessfully challenged undefeated WBO middleweight champion Demetrius Andrade for his world title, losing a unanimous decision with scores of 118–109, 118–109, 116–111.
[17][18] Williams announced his retirement from professional boxing in October 2024, stating he had suffered several concussions throughout his career and was concerned about chronic traumatic encephalopathy.