Bryan DeCorso fired an 8-under 63 on Friday to move into the lead after two rounds of the Midwest Classic.
DeCorso used the big round to move to 10-under-par 132, and is one shot clear of the field. Benoit Beisser (68), Kevin Foley (70) and Christopher DeForest (67) share second place at minus-9.
The Canadian DeCorso is in position for his best result this season. He hasn't finished higher than a tie for 22nd, and missed the cut six times.
He's also in contention for his first win since the 2008 South Georgia Classic, but the top of the leaderboard is tight heading into the weekend. One shot behind the second-place group is defending champion James Nitties, who carded a 5-under 66 on Friday to reach minus-8 and grab a share of fifth.
Nitties shares that position with Paul Claxton (67), Matt Weibring (69) Russell Henley (66) and Brenden Pappas (65).
On Thursday, threatening weather caused a delay of more than three hours and play was suspended due to darkness. The first round was completed Friday morning, and the field managed to get through the second round as well.
DeCorso was in one of the final groups starting from the first tee for his second round, and shined during his 18 holes.
He got off to a quick start, sinking four birdies in his first five holes, and a birdie at No. 8 put him at minus-7 going around the turn.
DeCorso stumbled to a bogey at 11, but followed with back-to-back birdies to rebound. He then drained two more birdies at 16 and 18, both par 4s.
"My caddie and I talked today about talking through a few more shots so I wouldn't play as fast. I also eliminated some of the mental errors I made yesterday," DeCorso said. "I made three bogeys with wedges yesterday and that's just a mental mistake. Today I played well off the tee and my mid-irons have been great."
But DeCorso was only left in first place after DeForest, who was in one of the final groups off the 10th tee, stumbled at the end of his round.
DeForest was sitting at minus-6 following a bogey at the first, but strung together an eagle-birdie-eagle stretch from the fourth. He gained five strokes in that stretch to move to minus-11.
However, he bogeyed his final two holes and settled into a share of second.
Beisser and Foley were in good position to fight for the lead at the start of the second round. However, Beisser stumbled to two bogeys near the turn, while Foley was up-and-down with five birdies and four bogeys.
NOTES: The cut line fell at 2-under 140...Among those to miss it was Chris Wilson, who won the Price Cutter Charity Championship last week...Alan Wagner was disqualified Friday.