Dufner, who has produced a series of solid if unspectacular finishes this year, reeled off a homeward nine of 31 today after what had been a roller coaster opening nine where he recorded two eagles, a birdie and three bogeys.
Dufner has yet to record a top ten in eight previous starts in the event so he appears on track for his best ever finish at Harbour Town and his 5th PGA Tour victory to go with his six runner-up finishes.
"Trying to play this week with low expectations," said Dufner. "To have a trust and belief that my game is pretty good right now. I can compete and play some good golf. Last week was a mixed bag of things for me, but it gave me a lot of confidence in two ways. It kind of told me that my game is pretty good.
"I made a lot of birdies. It also gave me a lot of confidence going forward at Augusta playing in the future. I feel like this golf course has always been a good set up for me. I haven't had amazing results here, but I've been pretty consistent. We'll see how it goes tomorrow."
Kevin Kisner and Webb Simpson are tied in 3rd position one shot behind DeLaet and are continuing their good form at the event, both having finished runner-up in previous years.
Cameron Smith has led or shared the Australian lead all week and despite a third round of 71 continues to do so. The Queenslander now finds himself in a share of 20th position although now eight shots from the lead.
Rod Pampling is 43rd, while Marc Leishman was the only other Australian to make the cut and after a horror start to his third round finished with 74 today and is now back in 53rd position.