Williams turned
professional as a
light-middleweight in 2011. Aged 18, he won every round against the more experienced Ryan Clark and won the vacant
Commonwealth light-middleweight title in November 2014 with a 2nd-round-stoppage win over
Michael Lomax.
Williams vs. Carslaw The following year, he added the vacant British national title by stopping Kris Carslaw in the second round of their bout at
Manchester Arena.
Williams vs. Corcoran 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.
Williams vs. Smith Williams was controversially defeated by former WBO light-middleweight world champion
Liam Smith on 8 April 2017 at the
Manchester Arena. Owing to incorrect weight for the bout, Smith was ineligible to inherit the interim WBO light-middleweight world title (held by
Canelo Álvarez who is moving to a higher weight and expected to vacate the title).
Williams vs. Fox On 21 December 2019 Williams fought Alantez Fox, ranked #2 by the WBO and #12 by the IBF at middleweight. Williams won the fight with a fifth-round stoppage.
Williams vs. Robinson On 10 October 2020 Williams defeated Andrew Robinson with a first-round knockout.
Williams vs. Andrade 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.
Williams vs. Eubank Jr On 5 February 2022 Williams fought Chris Eubank Jr, ranked #1 by the WBA, #3 by the WBC, #5 by the WBO and #7 by The Ring. Eubank Jr scored four knockdowns en route to a 12-round unanimous decision victory, the judges scoring it 117-109, 116-109 and 116-108 for Eubank Jr.
Williams vs. Sheeraz Williams was stopped in round one by Commonwealth middleweight champion
Hamzah Sheeraz at the
Copper Box Arena in London on 10 February 2024.
Retirement and comeback 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. In October 2025, he reversed his decision to retire, stating in a post on social media that "the time has come and I'm ready to rumble again." ==Professional boxing record==