MacNeil returned to Q School in January 2015 and was defeated in the final round on day three by Jason Wilson. However, after all four days had been completed he finished second on the Order of Merit to earn a new two-year tour card. At the World Cup, MacNeil and Part lost 5–4 to New Zealand in the first round. He qualified for a couple of European Tour events in 2015, but was knocked out in the first round of both. In October at the 18th Players Championship, MacNeil defeated Wes Newton 6–2, Eddie Dootson 6–3, Jamie Caven 6–3 and Justin Pipe 6–1 to reach his first PDC quarter-final in over five years, where he was beaten 6–1 by Gary Anderson.