After breaking into the top 32 on the PDC Order of Merit in 2016, Gurney was a seeded player for the first time at the 2017 World Championship and beat Jermaine Wattimena 3–1 in the first round. He won the first six legs of his second round match with Robert Thornton, but Thornton recovered to move 3–2 up. However, Gurney then took six of the final seven legs to move into the third round for the first time in his career and played Mark Webster. Gurney missed five darts to win 4–2, but held on to take it 4–3 and become the first player from Northern Ireland to reach a PDC World Championship quarter-final. His run ended with a 5–1 defeat to Michael van Gerwen. Comfortable victories over Alex Roy, Mark Webster and Vincent van der Voort saw Gurney advance to the quarter-finals of the UK Open. He then took five successive legs from 7–4 down to Simon Whitlock, but it still went to a deciding leg which Gurney took and dedicated the win to his best friend who died earlier in 2017. In the semi-finals he lost 11–5 to Peter Wright.