[6] Williams scored a try for Cardiff in the Challenge Cup final victory over Gloucester, which was later voted the Try of the Season.

[7] On 8 January 2024, Williams would leave Cardiff to join English side Gloucester in the Premiership Rugby from the 2024-25 season.

That was on the summer tour to the USA and Argentina when he scored a vital try in the 22-20 win over South Africa at the RFK Stadium in Washington DC.

He was again on the score sheet when he was selected for his next start in the 2018 autumn triumph over Tonga and he claimed another try on his Six Nations debut as Wales battled back to beat France in Paris on 1 February 2019.

Williams replaced Gareth Davies in the first pool game against Georgia and scored his first World Cup try within 20 minutes of his introduction.