Thitikul made history in February 2018 by becoming the inaugural winner of the Women's Amateur Asia-Pacific Championship at Sentosa Golf Club in Singapore. The 15-year-old Thai player took the title after defeating three players in a playoff. The win helped Thitikul move into the World Amateur Golf RankingTM top 40 and earned her invites to the ANA Inspiration and Ricoh Women’s British Open.
She also gained a place in the HSBC Women’s World Championship on the LPGA Tour and impressed among the LPGA elite with an eighth-place finish. She finished on 13 under, just four shots behind winner Michelle Wie.
Winner Ladies European Tour Thailand Championships 2017 • Gold medal Individual and Team 29th Sea games • Winner Dutch Junior Open 2017