Goggin, who began the day tied for 41st place at even par, was joined at 8-under-par 134 by Tom Scherrer, who shot a 69 in his second round at Empire Lakes Golf Club.
Jason Caron (67), Robin Byrd (66) and Jason Dufner (64) are one shot off the lead in a tie for third place at minus-7. Overnight leader Camilo Villegas struggled to a 1-over 72 and shares sixth place one stroke further back with six other players.
A two-time winner on the Nationwide Tour, Goggin was even par through his first seven holes before filling his scorecard with eight birdies the rest of the way.
'I got off to a good start...and then it all broke loose,' said the 31-year- old Australian, whose best finish this year was a tie for second place at the Utah Classic last week. 'I just went crazy on the last 11 holes without really trying.'
Birdie putts of 20 and 10 feet at 8 and 9 moved Goggin under par around the turn, and he made it four in a row with birdies at the 10th and 11th. He rolled in a 15-foot putt for his seventh birdie at the par-four 13th, and later finished his round with three straight birdies from the 16th.
'It just sort of happened,' Goggin explained after his 63. 'I wasn't really conscious of it...probably as relaxed as I've ever been shooting 7 or 8 under.'
Scherrer, who won the 2000 Kemper Open on the PGA Tour, put together a solid round of four birdies and two bogeys to move from a tie for second place overnight into a share of the lead.
The two-time Nationwide Tour champion was at 9 under for a spell after collecting his third birdie of the round at the par-4 10th, where he rolled in a 15-foot putt. But bogeys at 15 and 17 briefly dropped him to 7 under before he closed with a 9-foot birdie putt at the 18th.
'It's too early to get excited,' said the 35-year-old, who hasn't won on any tour since his only PGA Tour title five years ago. 'I'm not good enough to throw away shots and make them up on the next hole.'
Joining Villegas in sixth place were Garrett Willis (68), Jaxon Brigman (67), Steve Pate (67), Mike Heinen (70), Keith Huber (68) and John Mallinger (68).
Ninety players missed the even-par cut line. Saxophonist Kenny G finished with the highest score at 23-over-par 165.