The evergreen 44-year-old's flawless, nine-birdie round followed his opening 68 at Castle Pines to leave him five shots clear of his nearest pursuer, Sweden's Alex Noren midway through Friday's action.
Back in business at the venue of his maiden PGA Tour start 24 years ago, Australia's former world No.1 was in imperious mood, holing a 10 footer for a birdie at the first and reeling off three more in the first eight holes before reaching the turn in 32.
He made three more in a row from the 12th hole and also gained shots on the short 16th and par-four 17th to come home in just 31 strokes. Scott was a remarkable 13 under at halfway, having dropped just one shot over the two days.
Noren shot a second consecutive 68, trying to keep pace with the veteran, with overnight US leader Keegan Bradley a further shot back halfway through his second round.
Only the top 30 will advance to the showpiece Tour Championship in Atlanta, where the winner will pocket a $US18 million ($A26.85 million) prize.
After starting the week in 41st position, Scott has rocketed into the top 10 in the projections and is on course to once again qualify for the East Lake season finale.
Scott is the only man to have made the FedEx Cup playoffs every season since its inception in 2007, but for the moment he's more interested in racking up a triumph this week.
"I still believe I have the game in me to be in that elite group of players on the PGA Tour and I still think I've got some wins in me out here," Scott had said after his first round, and he still looked every inch the thoroughbred with his outstanding display among Friday's early starters.
