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Judd Trump exited the Scottish Open after losing 5-4 on a re-spotted back to Thailand’s Thepchaiya Un-Nooh.
Un-Nooh, the world number 57, missed a black to win the match and Trump levelled on points in the decider.
But the 2019 world champion missed a long-range pot on the re-spotted black, allowing Un-Nooh to secure a semi-final spot.
“I just believed,” Uh-Nooh said. “I had never beaten Judd before.
“I just believed in myself that I could do it. To beat him today, I am so happy.”
Trump, who described the loss as “shocking”, reached the quarter-finals having pocketed a maximum 147 break earlier in the tournament at Edinburgh’s Meadowbank Sports Centre.
And the world number three impressed with breaks of 104, 102, 86, 61, 53 and 52 against Un-Nooh.
But his opponent, who almost lost his professional tour card last season, dug deep and forced a decider with a century break of 104.
Victory will see Un-Nooh face either Kyren Wilson, a former World Championship finalist, or Gary Wilson, the world number 32, on Saturday.
The remaining quarter-final matches will take place later on Friday.
Mark Selby, winner in 2019 and 2020, plays 2017 champion Neil Robertson and Ricky Walden faces Joe O’Connor.