Pelle Edberg continued his birdie blitz at Black Mountain Golf Club to set the clubhouse target on day two of the True Thailand Classic Presented by Chang.
The Swede made nine birdies in his opening 65 on Thursday and took his tally for the week to 16 in round two as he signed for a 67 to move to 12 under, one shot clear of Thailand's Panuphol Pittayarat.
Edberg has an official affiliation with Black Mountain, spending much of the winter practising here, and admitted after the first round that he knows the layout better than his home course in Sweden.
The 36 year old has so far put that local know-how to good use and had seven birdies and two bogeys on Friday as he seeks a first European Tour win at the 200th attempt.
Birdies on the fifth, sixth and ninth gave him a two-shot lead at the turn but when he bogeyed the 11th, he slipped into a four-way tie for the lead before Pittayarat hit the front on his own.
Edberg picked the shot back up on the 13th but gave it straight back on the next before a hat-trick of gains from the 15th moved him back to the top of the leaderboard.
Pittayarat did not have a blemish on the card in his 65, making birdies at the tenth, 12th, 18th, second, fifth, sixth and ninth to sit two shots ahead of American David Lipsky, South African Shaun Norris and Scot Simon Yates.
Yates lives in Hua Hin and, like Edberg, can draw on a wealth of local knowledge which he admits can give him an edge.
The 45 year old made five birdies and a bogey in his second round and revealed following his 68 that he had borrowed a putter off course owner Stig Notlöv.
"I have a new driver which has been great and that has made a big difference this week," he said. "The other club that is working well is the putter that the owner of Black Mountain gave me last week to try and has been great as well.
I was telling Stig last week that my putting was terrible and he gave me the putter and told me to use it, so I did! - Simon Yates
Lipsky and Norris also signed for rounds of 68 to get to nine under, a shot clear of Benjamin Hebert who equalled the course record with a 64.
The Frenchman had six birdies and an eagle on the sixth to match the first-round score of American Peter Uihlein and Northern Irishman Michael Hoey's opening effort from last year.
Thailand's Piya Swangarunporn and the Indian duo of Rashid Khan and Chiragh Kumar were also at eight under, with Spaniard Carlos Pigem a further shot back alongside overnight leader Uihlein, who had an early bogey.
Local favourite and three-time European Tour winner Kiradech Aphibarnrat signed for a 69 to sit at one under and faced an anxious wait to see if he would make the cut.