Thailand's Phachara Khongwatmai became the youngest winner of a professional golf tournament when he triumphed at the US$65,000 (S$82,000) Singha Hua Hin Open on Sunday.

The 14-year-old amateur posted a final round of four-under 67 (total 13-under 271) for a four-stroke victory at the Asean PGA Tour event.

Fellow Thais Prom Meesawat and Sutijet Kooratanapisan tied for second after shooting rounds of 68 and 69 respectively at the Royal Hua Hin Golf Course.

Japan's Ryo Ishikawa had held the record as youngest winner when he won the 2007 Munsingwear Open KSB Cup as a 15-year-old.