Un-Nooh was a semi-finalist at the Indian Open last season
Three Thai players made it through to the quarter-finals of the SangSom Six Red World Championship with fine wins in the last 16 in Bangkok on Thursday.
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Local favourites Thepchaiya Un-Nooh, Boonyarit Keattikun and Noppon Saengkham are all still in with a chance of taking the top prize of 2.5 million Baht (around £45,000) on Saturday.
Un-Nooh, Thailand’s highest ranked player at 47th in the world, scored a superb 6-3 win over Judd Trump in the last 16. He will now meet world under-21 champion Keattikun, who beat Ryan Day 6-4.
Saengkham edged out Michael White 6-5 to earn a tie with Joe Perry, who beat Anthony McGill 6-1.
Matthew Selt followed up his 6-2 win over Ding Junhui by beating Robert Milkins by the same scoreline. He now meets Marco Fu, a 6-2 winner over Muhammad Asif.
Mark Selby has progressed smoothly through the bottom half of the draw
World number one Mark Selby comfortably saw off Muhammad Sajjad 6-2 and now faces Liang Wenbo, who won the Chinese derby against Yan Bingtao 6-4.
The quarter and semi-finals will take place on Friday, followed by the final on Saturday.