England’s Andy Sullivan shot a course-record 63 to share the lead alongside compatriot Richard Mansell after the second round of the Singapore Classic.
Starting on the 10th hole, Sullivan carded 28 on the front nine to finish level with Mansell and Germany’s Freddy Schott on nine under.
“It was unreal, I just caught fire,” said Sullivan, who opened with a 72.
Mansell shot a three-under 69 as two birdies on 16 and 18 put him level with Sullivan and Schott.
England’s Sam Bairstow and Paul Waring are a shot further back, part of a five-way tie on eight under. Scotland’s Ewen Ferguson is among a six-strong group on seven under.