2008: Wins the World Amateur Championship and turns pro.
2015: Wins the Six Red World Championship in his native Bangkok, thrashing Liang Wenbo 8-2 in the final. Reaches the semi-finals of the Indian Open and International Championship.
2016: Makes his first official 147 at the Paul Hunter Classic. This makes up for twice missing the last black on 140, at the 2015 UK Championship and 2016 World Championship qualifiers – the former earning him a brief appearance on TV show TFI Friday. Semi-finalist at the World Open and Paul Hunter Classic. Climbs to number 33 in the world.
2017: Runner-up to Mark Williams at the Six Red World Championship.
2018: Reaches the televised stages of the World Championship for the first time before losing to John Higgins on his Crucible debut.
2019: Wins his first ranking title at the Shoot Out – a fitting victory at the one-frame-knockout tournament with a shot clock as Un-Nooh is the fastest player on tour. Makes a 139, the highest break in the history of the event, to beat Jamie Clarke in the semi-final then sees off Michael Holt in the final. Reaches the Crucible before a narrow 10-9 defeat against Judd Trump in the last 32.