Morin had four birdies on the back nine, but he bogeyed the 18th hole just before sunset.
Micah Rudosky of Cortez, Colo., and Brad Westfall of Morgantown, W.Va., were tied for second.
A mid-afternoon lightning storm moved through the area, suspending play for 1 hour, 45 minutes. Thirty players unable to complete play before dark.
The top 25 finishers in the 72-hole tournament at the 7,624-yard Twin Warriors Golf Club course earn a spot in this year's PGA Championship at Oak Hill Country Club in Rochester, N.Y., in August. The winner also gets an exemption into six PGA Tour events next year.
The winner earns $53,000 from a total purse of $400,000.
There are 156 club pros in the field, which will be cut to the low 70 and ties after the second round.
Copyright 2003 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.