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. 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. Hallworth dropped off the tour at the end of the season and failed to advance through Q School.