The Australian, who has led the tournament from day one, looked as if he might slip back into the chasing pack midway through Saturday's round.
But a two at the par three 12th followed by consecutive birdies at the 14th, 15th and 16th holes ensured he finished the day on 12-under par, one stroke ahead of 19-year-old Ryo Ishikawa from Japan, who shot at six-under par 64.
Scott's compatriot, Jason Day is tied for second with Ishikawa on 11-under after a round of 66, with America's Keegan Bradley (68) and Scotland's Martin Laird (67) a shot further back on 10-under.
World number one Luke Donald posted a third round 64 -- the joint best round of the day -- to put him back in contention.
"It's nice to get in position. I putted a lot better today. That was really the only difference between today and the first two days," Donald said, AFP reported.
"I've been swinging it nicely, hitting a lot of fairways, a lot of greens. Just was able to get the putter rolling and hole a few putts, which was a pleasant surprise," Donald added, AFP reported.
The Englishman is three shots adrift of Scott on nine-under par along with Sweden's Fredrik Jacobson (67) and Rickie Fowler (69).
Rory McIlroy is five shots off the lead after posting his best round of the week (67) which leaves the U.S. Open champion in a tie for 10th place with America's Steve Stricker.
Tiger Woods lost further ground to the leaders on Saturday in his first tournament since recovering from injuries to his left knee and Achilles tendon.
The former world number one posted a two-over par round of 72 and is now 13 shots adrift of Scott.
"I really hit it good coming home, started hitting the ball the right flight, every tee shot was flash, everything was back to where it was at the beginning of the week," Woods said, AFP reported.
"Only difference is I didn't putt well again today, two horseshoes, three-putted 18, and then obviously made a bogey with a sand wedge on 16. That's four shots right there," he added, AFP reported.
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