There he beat four players in the preliminary rounds to reach the main stage, most notably defeating reigning Lakeside World Champion Christian Kist 3–2 in his final match.

Once on stage, he beat established campaigners Jan Dekker 3–1 and Ross Montgomery 3–2 to reach the quarter-finals, before losing out to eventual champion Stephen Bunting 3–1 in sets.

In February 2013, he came closest to winning his first BDO ranking title, beating Jan Dekker and Remco van Eijden to reach the Scottish Open final, before losing to Wesley Harms 5–4.

In April, he made it to the semi-finals of the German Open, beating Paul Jennings and Richie George, but lost to champion Geert De Vos.

Williams made his debut at Lakeside in 2014 as the sole Welsh representative in the men's competition, and hoped to emulate countrymen Leighton Rees, Richie Burnett and Mark Webster by becoming BDO World Champion, but lost in the first round to Dave Prins.

Another final at the England national after defeating World number one Glen Durrant and Berkshire's Jason Heaver in the semi-final, he eventually lost out 6–5 to Cambridgeshire's Dennis Harbour.

[5] Williams got the late call-up and played alongside Jonny Clayton for Wales at the 2024 PDC World Cup of Darts after Gerwyn Price was ruled out due to health issues.