McGarry qualified for the 2004 PDC World Darts Championship where he beat Rory Orvis 3-0 and Mark Holden 3–0 to reach the third round, losing 4–0 to Phil Taylor.
The result meant McGarry took one of the reserved spots for the event and eventually earned qualification.
He was drawn into Group C with Mervyn King, Dutch wonderkid Michael van Gerwen and BDO World Champion Mark Webster.
McGarry went on to score a big upset win over Webster in a final leg decider in his opening group game.
McGarry qualified for the 2014 PDC World Darts Championship by winning the 2013 Irish Matchplay, defeating Connie Finnan six legs to four.