Peter Uihlein extended his overnight lead to two shots early on day two of the ISPS HANDA Perth International.
The American fired an impressive opening 65 in windy conditions at Lake Karrinyup Country Club on Thursday afternoon and picked up a single shot in the first 13 holes of his second round to get to eight under.
That gave him a two-shot cushion over Australian Rhein Gibson, who was one under through 12 holes, and Shiv Kapur and Romain Wattel, who were among the later starters.
Magnus A Carlsson, Richard T Lee and Todd Sinnott were then at five under alongside Scotsman Jamie McLeary, who was four under for his round through eight holes.
Starting on the tenth, Uihlein birdied his opener and the 14th before giving a shot back on the 16th to turn in 35. He then dropped another shot on the second but regained it on the third.
Gibson made good progress with birdies on the fourth and seventh but back-to-back bogeys meant he turned in 36 before picking up a shot on the tenth.
Swede Carlsson had picked up a single shot through 12 holes, with home favourite Sinnott one under through 14 and Canada's Lee at the same mark through six.
McLeary was a big early mover with birdies on the first, second, fourth and sixth.
There was then a large group at four under led by Frenchman Julien Quesne, who was an impressive five under for the day through his first 14 holes.