During the second round, Scott made birdies at holes, 3, 6, 8 and 9 and only a bogey at No. 10 kept him from shooting 66.
He shot 31 on the front nine.
"I'm very happy with the way, I'm driving (the golf ball)," Scott said. "It's a difficult course."
Durant (68), a first-round co-leader with Retief Goosen, saved par at No. 18 to grab a piece of the lead for another day.
Defending champion Bart Bryant did not qualify this year.
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