Eleven players are knotted in a group one shot back at StoneWater Golf Club.
Boros parred his first six holes, until a tap-in birdie putt at the seventh. He made it two in a row when his 8-footer at the eighth fell into the cup.
Boros ran home a 6-foot par save at the 12th, then drained an 8-footer for birdie two holes later. He closed his round in style with a 12-foot par save at 17 and a 6-footer for birdie at the last.
'I putted well and that always helps,' said Boros, who won the 1996 Greater Vancouver Open on the PGA Tour. 'You've got to think around this golf course. Three more days like that, I'll take it.'
Dufner broke into red figures with a chip-in birdie at the par-3 third. He collected his second birdie in as many holes with a short putt at three, then sank a 4-foot birdie putt at the seventh. Dufner missed a 2-footer for par at the next hole, but still made the turn at 2-under 33.
On the back nine, Dufner ran home a 10-foot birdie putt at the 10th. He kicked in a short birdie putt at the par-5 13th, then parred out for his piece of the lead.
'I just played pretty solid, nothing spectacular,' said Dufner. 'You've got to use your head out there this week. It's a great addition to the schedule, that's for sure.'
Collins mixed five birdies and a bogey on Thursday, but like everyone else, was raving about the StoneWater layout.
'The greens are the best greens we've played, in my opinion, this year,' said Collins, who won the Henrico County Open earlier this season. 'They are firm, fast and smooth.'
Pride were 2 under through 15 holes, then birdied 16 and 18 to jump into the share of the lead.
Tom Carter, P.H. Horgan III, David McKenzie, Kris Blanks, Greg Bruckner, Camilo Villegas, Dave Christensen, Ben Bates, Steve Collins, Scott Parel and Keith Nolan are tied for fifth place at 3-under-par 68.