Michael Hoey is three behind new leader Miguel Angel Jimenez after a frustrating day at the True Thailand Classic.
Hoey – who broke the course record on Thursday with a 64 – carded a level-par second round of 72 on Friday.
Veteran Spaniard Jimenez carded a six-under-par 66 and leads by one from Thailand’s Kiradech Aphibarnrat.
Three players are tied for third, with Richard Lee, Scott Hend and home star Thongchai Jaidee on nine under.
Hoey – who was celebrating his 36th birthday – had two birdies and two bogeys in Friday’s round.
His is tied for sixth with England’s Tom Lewis and Matthew Baldwin and Sweden’s Johan Carlsson.
“I threw away a few shots which was disappointing. I should really have got to 10 under at least,” said Hoey.
“It could have been worse and at least I am still in contention.
“My game is good. I drove it in the water a few times by being slightly aggressive.”