At the 2018 World Championship, Dobey drew Phil Taylor in the first round. Taylor was appearing in his final World Championship following his decision to retire after the conclusion of the event. Dobey lost 3-1. He played in the 2018 UK Open in Minehead, reaching the fifth round before losing out to Corey Cadby. He reached 2 finals on the Pro Tour in 2018, losing 6-2 to Michael van Gerwen at Players Championship 5 despite having an average of over 109, and then lost 6-2 to Krzysztof Ratajski at the penultimate Players Championship event of the year. These performances aided him in qualifying for the 2018 Players Championship Finals where he had a run to the quarter finals, losing out 10-2 to eventual winner Daryl Gurney.