[2] In June 2011, he reached the last 16 of a PTC event, beating Peter Ebdon, Nick Jennings and Ali Carter, before losing to Graeme Dott.

[4] In May, he qualified for the main snooker tour by coming through the third 2012 Q School event with a 4–3 win over Mitchell Mann in his final match, with a break of 102 in the deciding frame.

Williams then swept into his first ranking event semi-final with the loss of just one frame as he eliminated Andrew Higginson (4–1), Mike Dunn (4–0) and Anthony McGill (4–0).

[13] In World Championship qualifying, Williams earned wins over Lü Haotian, Liu Chuang and Pankaj Advani to face Fergal O'Brien for a spot in snooker's biggest event for the first time.

However, O'Brien then compiled a break of 57 to level the scores meaning a respotted black was required to settle the match which Williams duly potted to seal his first round berth.

[18] Williams' only win at the venue stage of a ranking event this season came at the UK Championship, with a 6–4 victory over Sam Baird, before missing a good chance when 5–4 up against Ricky Walden to be ultimately knocked out 6–5.

[24] At the 2016 Paul Hunter Classic, Williams defeated Simon Lichtenberg 4–1, Joe Perry 4–2 and Andrew Higginson 4–3, but was then heavily beaten 4–0 by David Grace.

Wins over Grace, Andy Hicks and Michael White at the Welsh Open saw him reach the last 16 of a ranking event for the second time this season and he was whitewashed 4–0 by Stuart Bingham.