Recorded the biggest of his five European Tour wins, and in the process the biggest win in Finnish golfing history, with a fine victory at the 2014 Volvo World Match Play Championship, where Ilonen defeated defending champion Graeme McDowell and top seed Henrik Stenson on the way to the prestigious match play title. Was already enjoying an impressive 2014 season, having finished second at the Commercial Bank Qatar Masters, before another successful week at the Irish Open resulted in European Tour title number four. Also won in 2013 at the Nordea Masters in Sweden, where second and third rounds of 63 and 65 propelled him on his way at Bro Hof Slott GC. Became the first man from his country to win on The European Tour International Schedule with victory in Indonesia in 2007. Achieved further success that year when he won the Scandinavian Masters title to become one of seven multiple winners of the 2007 season. The previous year, he used the experience of winning The Amateur Championship at Royal Liverpool in 2000, to full effect at the The 135th Open Championship, to finish 16th at the same venue. Turned professional in 2001, immediately showing a liking for Major Championship venues by finishing tied ninth behind David Duval in The Open Championship at Royal Lytham & St Annes.