In 2015 Keattikun entered the World Under-21 Snooker Championships in Bucharest as the number 1 seed.

Keattikun went on to reach the final and defeated Jamie Clarke 8–7 to win the championship.

As a result, he was given a two-year card on the professional World Snooker Tour for the 2016–17 and 2017–18 seasons.

[2][3] He lost his first eight matches of the 2016/17 season, before beating Scott Donaldson 5–3 in German Masters qualifying.

His only other victory this year was at the Welsh Open, where he defeated 1997 world champion Ken Doherty 4–1, before losing by a reversal of this scoreline to Mark Allen.