(CNN) -- Englishman Simon Khan carded a final round five-under-par 66 to claim an unlikely one-shot victory in the European PGA tournament at Wentworth.
The 37-year-old -- who had only one previous European Tour victory to his name in 215 tournaments prior to this week -- finished on a 72-hole total of 278 (-6).
Compatriot Luke Donald (71) and Sweden's Fredrik Andersson Hed (67) led the chasing pack, but overnight leader Chris Wood's hopes faded as he posted a six-over-par 77 to tie for sixth position.
Although only ranked 471st in the world, Khan does have a good record around Wentworth and finished second to David Howell in the same tournament in 2006.
"This win is as much for my family as it is for me -- it's unbelievable to be standing here right now," Khan told the official European Tour Web site.
"This means everything. This tournament is the reason I started playing golf and just being here is special this year."
Khan, who had to rely on a sponsor's invitation to play in the event, adds the title to the Wales Open he won back in 2004.
World number three Lee Westwood carded a final round 66 to finish joint 11th, while first round leader Danny Willett managed to hang onto fifth place despite a final round 74.