The Thai was a picture of consistency over the weekend, carding two consecutive rounds of 68 thanks to a run of 39 bogey-free holes and claiming a four-shot triumph over Italy's Francesco Molinari, who carded the low round of the day with a 66.
Earlier, Indians SSP Chawrasia (76-75) and Shiv Kapur (77-75) had missed the midway cut.
World Number 4 Rory McIlroy finished at six under with a closing 71 and Brandon Stone, Alex Noren, Callum Shinkwin and Richard Sterne earned their places at the Open Championship by finishing in the top 12.
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