Gene Jones shot a season-best 64, and is two shots back. Jeff Sluman birdied four of his last five holes to join R.W. Eaks at 7 under.
There was no negative stuff that ever creeped in there for 18 holes, said Quigley, who matched his career low score in 11 years on the tour.
It easily could have.
He got up and down from 78 yards after putting his second shot in the water on the par-5 sixth hole and chipped in for par from heavy rough on No. 8.
Its hard to trash nine birdies and an eagle, but that save on eight was the whole turning point for the round, he said. A 1-under, 2-under, 3-under round turned into a 10-under because of that good fortune. If I make double there and go back to even, you dont know what the mind is going to do. You only get a few chances in this game in each round to either make it a good one or a bad one.
Quigley went 6 under over his next five holes, including holing out from 84 yards on No. 12 for an eagle. Birdies at 15 and 16 got him to 10 under, before he bogeyed No. 17. He knocked a 5-wood to within 12 feet on the 18th, but his eagle putt missed left. He tapped in for birdie.
The best finish for Quigley this year was third at last months Bank of America Championship. He has 11 career tour wins, but none since the 2006 Greater Kansas City Golf Classic.
He attributes his recent success on the green to switching to a belly putter a month ago, and changing to a more traditional right-handed grip, instead of the cross-handed style hes used throughout his Champions Tour career.
Ive always been a streaky putter. Lets hope this lasts three days.
Tom Purtzer shot the previous lowest opening round at the TPC Twin Cities, 63 in 2005, en route to winning the tournament.
Starting on the back nine, Jones birdied four of his first seven holes, and added another on No. 18. He birdied Nos. 2, 6 and 7 on the front side.
When I needed to, I made my up-and-downs all day, said Jones, who shot a 64 in Mondays qualifier at nearby Victory Links to make the 78-player field. It was a very easy day.
The combination of Thursdays rain and little wind enabled the field to continue posting low scores on the 7,100-yard course, just as they did during practice and pro-am rounds.
The greens are as good as weve seen all year, Sluman said. You could kind of throw the ball at the hole. Youre going to see low scores. We got out in the last group and when we looked up (at the leaderboard) it looked like the whole world was under par. At that point you know if youre playing well youre going to have quite a few opportunities.
Fifty-four players were under par.
Ed Dougherty, Gary Hallberg, John Harris and Loren Roberts are four shots back after shooting 66. Peter Jacobsen, Bernhard Langer and David Ogrin shot 67s.
Defending champion D.A. Weibring was one of 16 players to shoot a 4-under 68.