Atthaya Thitikul became the youngest-ever winner of a professional golf tournament recognized by the world rankings system, taking the Ladies European Tour's Ladies European Thailand Championship at the age of 14 years, 4 months and 19 days.
Thitikul shot 5-under to win by two shots. However, as an amateur, she ceded the winner's share of the prize money to the second-place player, Mexico's Ana Menendez, who had led after each of the first three rounds.
— Ladies European Tour (@LETgolf) July 9, 2017
Thitikul surpassed Lydia Ko as the youngest LET champion. Ko won the 2013 New Zealand Open at 15 years, nine months and 17 days.
Phachara Khongwatmai of Thailand is considered the youngest winner of a pro golf event of any significance. He won the 72-hole Singha Hua Hin Open on the ASEAN PGA Tour by four shots in 2013 at 14 years, 2 months, 18 days when he won. However, the event offered no world ranking points.
Canadian teen Brooke Henderson was 14 years, 9 months and 3 days old when she won a 36-hole event just outside of Montreal on the CN Canadian Women's Tour.
Ko was 14 years, 9 months and 5 days when she won the 54-hole New South Wales Open in January 2012.