Ilagan is a two-time quarter-finalist (2000 and 2006) in the WDF Asia-Pacific Cup. He has also reached the final of the Philippines Open in 2006 and 2007 along with the final of the 2008 Malaysian Open. Ilagan won the National Darts Federation of the Philippines qualifier to earn a place in the 2009 PDC World Darts Championship but was beaten by Finland's Marko Kantele 5–2 in the Preliminary Round.