- Ryo Ishikawa
- Japan (Tojigaoka Marine Hills Golf Club,Okayama)
The youngest golfer to win a professional tournament is Ryo Ishikawa (Japan, b. 17 September 1991), aged 15 years 245 days old when he won the Munsingwear Open KSB Cup at Tojigaoka Marine Hills Golf Club, Okayama, Japan on 20 May 2007. Source comes from marketing (Japan).