Overnight leader Sattaya Supupramai remained two strokes clear of his nearest challengers on day two of the King’s Cup presented by PTT Group.
Thailand's Supupramai, who is among Friday's afternoon starters, produced a stunning 63 on Thursday to open up a two-shot advantage.
And the World Number 1048 retained that buffer as the early starters failed to close the gap.
Fellow countryman Jazz Janewattananond briefly joined Supupramai on seven under par when he notched his fifth birdie of the day with three holes left to play, but bogeys at each of those three final holes saw him drop to four under.
Lin Wen-tang and Sutijet Kooratanapisan are safely in the clubhouse on five under, while Austrian Lukas Nemecz is among those another shot back after carding an eagle, four birdies and two bogeys in his second-round 66.
