Scott Hend finished birdie-birdie to post a course record equalling 64 and grab a share of the halfway lead at the True Thailand Classic Presented by Chang.
Pelle Edberg had set the target at 12 under in the morning session and as the shadows began to lengthen at Black Mountain Golf Club, it looked as though he would take the solo lead into the weekend.
But Hend had other ideas, and the Australian got up and down from a bunker on the 17th and then took advantage of the par five last to join the Swede at the top of the leaderboard.
A runner-up here last year, Hend made a flying start with a birdie at the first and an eagle at the par five second. He continued to take advantage of the par fives with gains on the sixth and 13th sandwiching a birdie on the par four 12th before his big finish.
Hend was one of the players to make the long trip from Florida after last week's WGC-Cadillac Championship, but he showed no ill effects and will head into the weekend in the hunt for a second European Tour title.
It's good to get into position once again for the weekend, we'll see what happens which is quite nice - Scott Hend
"I like this course, I like the area, I like coming to Thailand as it's a friendly place. I always have a pretty good time.
"After a lacklustre effort last week in the WGC in Miami, we'll see what comes now."
For Edberg, a win would result in a first title at the 200th attempt on a course he calls home during the winter.
The 36 year old has an official affiliation with Black Mountain and, after spending two or three months annually in Hua Hin for the last four years, he admits he knows the layout better than his home course in Sweden.
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 picking the shot back up on the 13th. He gave it straight back on the next before a hat-trick of gains, helped by lengthy putts on the 15th and 16th moved him back to the top of the leaderboard.
"I'm more satisfied with the result today than yesterday," he said. "I was playing extremely well yesterday. Today I played well but not as good.
It feels nice to see your name up there. It gets easier as well but on the other hand, on home soil, I hope I'm not as nervous about tomorrow as I was on Thursday - Pelle Edberg
Panuphol Pittayarat did not have a blemish on the card in a 65 that moved him to 11 under, making birdies at the tenth, 12th, 18th, second, fifth, sixth and ninth.
Welshman Rhys Davies, South African Shaun Norris, Scot Simon Yates and Americans David Lipsky and Peter Uihlein were then at nine under, a shot clear of Spaniard Javier Colomo, Thailand's Piya Swangarunporn, Scot Marc Warren, Indian duo Rashid Khan and Chiragh Kumar and Frenchman Benjamin Hebert - who joined Hend and Uihlein in posting a 64 this week.