The 43-year-old Dietsche, the head pro at Arrowhead Country Club in San Bernardino, Calif., had nine birdies and a triple bogey on the par-4 15th.
I tried to block out the hole from my mind, but the one mistake I made was at 15, Dietsche said. I hit the tee shot a little right and there was a tree that I was trying to cut the ball around. The ball hit the false front and came down in front of the green. I had a decent lie and tried not to be greedy and play it long of the hole, but it rolled back and gave me a bad lie and I rolled it all the way back again.
Hebert, a 39-year-old from Grand Traverse Resort & Spa in Michigan, had a bogey-free round at Reynolds Landing.
David Long had the best round on the Great Waters course, a 68 that left him tied for third with Terry Hatch, Ryan Benzel, Curt Sanders, Sonny Skinner, Craig Hock and Vince Jewell. Defending champion Chip Sullivan had a 75 at Reynolds Landing.
Dietsche needed just 26 putts.
I have been hitting the ball well recently but I have been putting the ball terrible so this wasnt expected, Dietsche said. But, I picked up a new putter at the Titleist van this week and it feels so comfortable and I made a whole lot of putts to show for it. The putter just seems to line up with my eyes really good. Whatever I was seeing out there seemed to work.
The top 20 finishers will get spots in the PGA Championship at Oakland Hills in August. The winner will earn $75,000 and also receive an exemption into the next five PGA Professional National Championships, a spot on the 2009 PGA Cup Team and exemptions into six PGA Tour events over a 12-month period.