The 14-year-old Thitikul entered the final day of 2017 Ladies European Thailand Championship two strokes behind leader Ana Menendez, but after the Mexican dropped four shots in the opening nine holes, the Thai teenager took control, winning the event by two shots.
Thitikul turned 14 on February 20, ensuring she broke Brooke Henderson's youngest ever winner of a golf tournament record
. Canadian Henderson was victorious in the 2012 Canadian Woman's tour aged 14 years, nine months and three days.
According to the Guinness Book for Records
, the youngest male winner of a pro tournament is Japanese teenager, Ryo Ishikawa who won the 2007 Munsingwear Open KSB Cup aged 15 years, 245 days.
"I committed to every shot I hit and stayed relaxed," Thitikul told the Ladies European Tour website
. "My caddie helped me a lot, not to think too much, to focus on my game plan and to plan the tee shots and second shots.
Despite her record-breaking victory, as an amateur player Thitikul was ineligible to collect her prize of €45,000 ($51,000), with second-placed Menendez taking home the money
"I'm so happy and proud of myself," said Thitikul. "I did not look nervous, but of course I felt nerves on the first tee and on the first hole."
It was Thitikul's father who encouraged her to take up golf.
"When I was younger, aged six, my father told me to play sport and he offered tennis or golf and I watched golf on TV and I liked it."
She'd already showed signs of her talent, leading up to her debut at a professional tournament, finishing as a runner up in the Queen Sirikit Cup in China, before going on to win the Taiwan amateur Open in June.
"This trophy," Thitikul said, "I give to Thailand and the Thai people."