Josh Broadaway fired a seven-under 64 in the stroke lead at the suspended Mylan Classic.
There was a two-hour, 20-minute weather delay that pushed the afternoon tee times back and the round was eventually suspended due to darkness.
Fifty-seven players will return to Southpointe Golf Club at 7:30 a.m. (et) on Friday to finish their opening rounds. Second round tee times will be delayed 30 minutes and will start at 7:50 a.m.
Chris Epperson carded a five-under 66 to share second place with Aaron Goldberg, who was minus-five through 13 holes.
Defending champion Kevin Kisner had a four-under 67 and is tied for fourth place. If Kisner can repeat as champion, he will be the first player in Nationwide Tour history to successfully defend a title.
Kisner was joined in fourth place fellow Americans Billy Hurley III, Craig Bowden, Jay Williamson and Brad Elder as well as Australian Nick Flanagan. Of that group, only Elder (16 holes) didn't complete his opening round.
Broadaway, who is winless on the Nationwide Tour, got off to a fast start with birdies on two and three. However, he stumbled to a bogey on the fourth. He erased that mistake with a birdie on the par-four sixth.
The 33-year-old, who plays cross-handed, poured in three consecutive birdie chances from the eighth to jump to minus-five.
Broadaway, who has five top-15 finishes in his last six starts, grabbed the lead with a birdie on the par-three 14th. After three pars in a row, Broadaway birdie the par-four 18th to push his lead to two strokes.
"It wasn't really easy. I was hitting some loose shots and getting some good breaks," Broadaway said. "Any time you're making putts it takes away the pressure off the rest of your game. You don't feel like you have to hit it close all the time."
Epperson, who is making just his third Nationwide Tour start of the year, started on the back nine and birdied four of his first eight holes to grab a share of the early lead.
After four straight pars around the turn, Epperson, wrapped bogeys on the fourth and sixth around a birdie on No. 5. He ended his round with birdies on eight and nine to get to minus-five.
John Daly is playing for the second straight week on the Nationwide Tour and rallied from a bad start to shoot two-under 69. He was two-over par after six holes, but posted five birdies and one bogey the rest of the way.
NOTES: J.J. Killeen, who is No. 2 on the tour's money list and could move on to the PGA Tour with a win, opened with a one-under 70 that left him tied for 40th...Flanagan won the 2003 U.S. Amateur at nearby Oakmont Country Club...Brett Swedberg and Phil Tataurangi withdrew during the round with injuries, while Brian Smock and Edward Loar withdrew after their rounds. Loar was flying home to Dallas to be with his wife, who went into labor earlier Thursday.