Cliff Kresge, Chris Tidland, Matthew Jones and Michael Sim all posted rounds of 5-under-par 67, while Craig Lile is 5 under par, but did not finish his opening round at the Ralston Creek Course at Daniel Island Club.
A 90-minute weather delay at the start of the round pushed the tournament back and almost half of the field was unable to complete the round. The players will be back in position at 8:00 a.m. ET Friday morning, but the second round is not expected to be completed until Saturday morning.
Kresge, who is sixth on the Nationwide Tour money list, parred his first five holes, then failed to get up and down for par from a bunker at the par-5 sixth. He atoned for the error with birdies at eight and nine to make the turn at 1 under par.
Kresge birdied the par-5 11th, then collected back-to-back birdies at 13 and 14. He three-putted the 16th green for another bogey, but he converted birdie tries from 8 feet and 4 feet at the last two holes for his share of the lead.
'This is a strong golf course,' said Kresge, who won this year's Oregon Classic. 'No doubt, if you shoot a score like today's, a 5 or 6 under, you played really well. I played great today.'
Tidland holed a 10-foot par putt on the 10th, his first hole of the round, then drained a birdie putt from the same length at 11. He ran home a 40-foot birdie putt at the 13th and followed up with a 15-footer for birdie at the next hole.
He closed his opening nine with a birdie at the par-5 18th. Tidland added another birdie at the par-3 fourth, then parred out for his piece of first place.
'I'm playing the best golf of my life right now,' acknowledged Tidland. 'It's tough. The rain on Tuesday softened up the course.'
Jones birdied the fourth, then holed a 15-foot eagle putt at the par-5 sixth. He birdied the eighth to make the turn at 4-under-par 32.
He recorded his third birdie at the par-4 10th, then parred his next five holes. Jones found the water en route to a bogey at the 16th, but a birdie at the closing hole moved his name to the top of the leaderboard.
Sim, an Australian, had the most up-and-down round of the co-leaders. He mixed three birdies and a bogey over his first seven holes, but then went birdie-bogey over five consecutive holes, starting at the 11th.
He finished with back-to-back birdies at 17 and 18.
Lile started on the back nine Thursday and birdied three of his first five holes. He tallied three birdies and two bogeys over his final five holes on the opening nine to make the turn at minus-3.
Lile birdied the second and fourth holes before the horn sounded.
Gavin Coles, Jess Daley, Matt Kuchar and Roland Thatcher are tied for sixth place at 4-under-par 68. Matt Weibring, Craig Bowden and Scott Gardiner are at the same score, but need to complete the first round.