Ilagan reached the semi-finals of the 2009 Winmau World Masters after qualifying from the earlier rounds into the last 16, where he defeated number two seed Scott Waites and then beat Steve West in the quarter-finals.

Ilagan represented the Philippines with Christian Perez in the 2012 PDC World Cup of Darts and together they were beaten 5–3 by the United States in the first round.

[1] Ilagan won the Philippines Qualifying Event for the 2013 World Championship and once there came back from three to one down in legs to Jamie Lewis in the preliminary round to win 4–3.

[5] He defeated Perez 4–1 to win the 2013 World Soft Darts Championship having eliminated Stephen Bunting in the quarter-finals and Randy Van Deursen in the semis.

[14] At the 2023 PDC World Darts Championship, Ilagan earned his first ever first round win at the competition, defeating Rowby-John Rodriguez in a deciding set.