Delsing's 63 bettered the former course-record of 65 at the 7,685-yard Senator Course at Capitol Hill that Todd Barranger carded on Thursday. He also set the Buy.Com Tour Championship record, breaking the mark of 64 set by Alabama native Spike McRoy two years ago.
Jeff Klauk, Eric Meeks and Mike Heinen are one behind Delsing at minus 7. Barranger and Keoke Cotner are two back of the leader at 6-under.
Delsing stepped to the 18th tee needing no worse than par on the final hole to tie the previous course record. However, he holed out from 208 yards for eagle to break the record by two shots.
'I feel fortunate to get back into contention and have a chance to compete on the weekend,' said Delsing, who stands 19th on the Buy.Com Tour money list. 'I played great (Thursday) from tee-to-green, but didn't putt very well.'
The winner of this year's Omaha Classic started his round slowly. He rolled in a 40-footer on two for birdie, before sinking a five-foot birdie putt at the 681-yard par-5 fifth.
'That hole (five) was something. I hit 3-wood off the tee and a 5-wood for a second shot,' Delsing said. 'We were laughing because we were trying to figure out the yardage and we needed an abacus. I had 414 yards to the front for my second shot. If we ever get to the day where somebody can reach that, then I'm just going to pack them in.'
Delsing held his round together with an up-and-down from 100 yards at the sixth.
'Rounds like this are always held together by a couple of really good pars that you make after you hit a bad drive or a bad chip,' said Delsing. 'This golf course is relentless in terms of never letting up. It keeps you down and kicks away at you.'
Delsing then caught fire carding four birdies in a five-hole stretch starting at seven. He sank a 12-footer at the par-3 seventh, then got up-and-down on eight, before sinking a six-footer on the ninth to make the turn at 31.
Around the turn, he continued his streak at 11 by making a five-footer to go to 6-under for his round. However, Delsing faltered at the next with his only bogey of the round, when he three-putted from 35-feet.
Delsing got that stroke right back with a birdie on 13. He got to 7-under for his round with a birdie at 17. After hitting 3-wood off the 18th tee, Delsing then holed a 4-iron from 208 yards.
'It's amazing, just when you get to the point where you get really fed up with this game, the golf gods throw you a bone like this,' said Delsing. 'It was a special day for me.'
Barranger is one of many players looking for a big week that will secure their spot in the top 15. Barranger, currently 15th on the money list struggled to a 73 after shooting a 65 Thursday, which bettered his first-round score at this event by 20 strokes from a year ago.
Gavin Coles and Roland Thatcher are three shots back at 5-under 139. Patrick Moore, Jason Gore, Ken Green, Steven Alker, Tyler Williamson, Jason Buha, Charles Warren and Aaron Baddeley are one behind that pair.
Gore and Moore are two of the four men at this event looking for their third wins of the season. Gore, Moore, Cliff Kresge and Arron Oberholser are the two-time winners on the Buy.Com Tour this season. If one of these four were to win this event, they would gain the automatic 'Battlefield' promotion to the PGA Tour.
Oberholser struggled to a 1-over 73 on Friday and is at minus-1 143. Kresge recovered from a bad first-round to card a 69 Friday to climb to even-par 144.
Full-field scores from the Buy.Com Tour Championship