[4] He then found success in junior and amateur levels and was given the opportunity to play future World Champion Mark Selby aged 12 in 2009, after winning that year's Under-17 Lincoln and District Billiards and Snooker Association crown.

[11] All 128 players on the snooker tour automatically play in the first round of the UK Championship and in Hallworth's debut at the venue stage of a ranking event he lost 6–1 to Mark Williams.

[13] A run of 10 consecutive defeats from June 2015 to December was ended when Hallworth overcame Thepchaiya Un-Nooh 5–4 in the German Masters qualifiers.

[14] He then beat Andy Hicks 5–4 on the final black to play in a ranking event outside of the United Kingdom for the first time, but was whitewashed 5–0 by world number one Mark Selby.

The Shoot-Out was upgraded to a ranking event this season and Hallworth made the quarter-finals with wins over Boonyarit Keattikun, Michael White, Daniel Wells and Li Hang.