Khongwatmai became the youngest winner of a professional tournament when he won the Singha Hua Hin Open on the All Thailand Golf Tour in July 2013 at the age of 14.

[3] On the Asian Development Tour, he won the PGM CCM Rahman Putra Championship in March at the age of 15, becoming the youngest winner on that tour.

[3] He also won the final tournament of the year, the Boonchu Ruangkit Championship to finish fifth on the ADT Order of Merit and earn his 2016 Asian Tour card.

[2] Khongwatmai represented Thailand in the 2024 Summer Olympic Games in Paris, withdrawing from the 4th round of competition.

This biographical article relating to golf in Thailand is a stub.