Jason Hartwick moved into third place at minus-6 thanks to a 68. Hartwick was lucky to even make his tee time as he was involved in a car accident on his way to the course. He arrived just five minutes prior to his tee time.
Steve Friesen shot 67 to climb into fourth place at 5-under-par 135. Todd Tanner, who shared the first-round lead with Wes Heffernan, stumbled to a 1- over 71. He shares fifth place with Dustin Risdon (66) at 4-under-par 136.
Guetz was just one-under over his opening nine holes at Royal Colwood Golf Club. However, he turned it on around the turn. Guetz, whose brother Brian won the Barton Creek Challenge earlier this year, collected four birdies on the back nine, including a chip in on 17 for his share of the lead.
'It wasn't quite as solid as Thursday,' Guetz admitted. 'I had to make three or four four-footers just to save par.'
Lieber drove the green on the short par-4 17th, but just two-putted for birdie. He came right back with a birdie on 18 to join Guetz in the lead.
'I'm pretty comfortable going into the weekend,' Lieber stated. 'I didn't hit many drivers out here, and usually I'm not that disciplined. I'm just trying to stay out of my own way and not get myself in trouble.'
Wes Heffernan tumbled into a tie for seventh at 3-under-par 137 after a 2-over 72 Friday. He was joined at minus-3 by Michael Walton, Wil Collins, Rick Gibson, Mike Grob, Danny Sahl and Byron Smith.
Lee Williamson, who has already won twice this season, is one stroke further back, along with six others, at minus-2.
The cut line fell at 3-over-par 143 with 66 players advancing to the final two rounds. Among those missing the cut was 2005 champion Craig Taylor, who was plus-7.