Wiesberger shot even-par 72 Thursday when players battled blustery, shifting winds but capped his second-round 65 with a chip-in from the fringe for birdie and a one-stroke lead. He's at 7-under 137 after 36 holes.
Marcus Fraser had seven birdies and a pair of bogeys in his second round to get to 6-under for the tournament and is in second. Oscar Floren, who also shot 65 Friday, is in third at 5-under.
First-round leader Victor Dubuisson staggered to a 3-over 75 with six bogeys and three birdies. He's at 1-under for the tournament, tied for 19th.
Wiesberger had two bogeys and a double bogey -- at the par-3 13th -- in his round Thursday but was clean Friday.
He played the second nine of the Blackstone Golf Club first, opening with three pars but getting a birdie at the 13th. He added birdies at 15 and 18 and made the turn at 3-under.
Wiesberger had a birdie at the second hole -- one of the holes he had bogey on in the first round -- and back-to-back birdies at 5 and 6. He took the outright lead with his chip-in from the fringe at No. 9, where he had a bogey Thursday.