Maggert carded a third-round 69 to lead Nick Price by a couple at 15-under-par. David Duval is just three shot back after a 5-under-par 67. Price posted the round of the day, a 7-under-par 65.
Maggert began his third round with a birdie at the 1st, and played consistently, if not spectacularly, throughout the day. The two-time Tour winner managed four birdies to just one bogey for his third-successive sub-70 round.
'I had opportunities to keep the lead up around four or five shots and for whatever reason it didn't happen,' said Maggert, whose trying to become the first wire-to-wire winner of this event in 23 years.
'But two shots is a good spot to be, especially the way I've been playing.'
Price got off to a great start on Saturday, birdying four of his first seven holes. After making the turn in 4-under-par 32, Price birdied the 11th, 13th and 17th to move to 13-under for the tournament - where he finished the day.
'I wasn't trying to get into the last group. I just wanted to get close enough to have a shot at it tomorrow,' said Price, who seeking his first PGA Tour win since the 1998 FedEx St. Jude Classic.
'The most important thing for me is to go out and win.'
Sitting in the clubhouse, Price picked up another shot on Maggert, when the Texan failed to get up and down from the greenside bunker at the par-3 16th. That bogey dropped Maggert to 14-under, just one-shot clear of Price.
Showing his mettle, Maggert responded by sticking a 9-iron to 12 feet at the par-4 17th. The ensuing birdie gave the 36-year-old a two-stroke cushion with one hole to play.
Maggert had a chance to extend his lead to three at the par-4 18th. But this time, his 12-foot birdie putt slid by the hole.
Par-4s weren't the problem on Saturday. Maggert played them in 4-under. It was the par-5s that cost him. Though he didn't drop any shots on the four longest holes, he didn't make any birdies on them either.
'That's like giving away strokes to the field,' said Maggert.
Duval had the start he wanted on Saturday, he just didn't get the desired finish. Playing in his first full event since the British Open, Duval birdied the first three holes to move to 10-under-par.
Despite dropping a shot at the 9th, Duval played a near-flawless back nine. Seeking his first win since the 1999 BellSouth Classic, Duval birdied the 11th, 13th, 15th and 17th to, at the time, climb within one of Maggert at 13-under-par.
But Maggert's birdie at the 17th, coupled with a Duval bogey at the 18th, left the world's No.3-ranked player three shots back entering the final round.
With a 9-iron in hand, Duval hooked his approach shot into the left rough guarding the green. His third shot also failed to reach the green, resulting in a bogey 5.
'I'm right where you want to be going into Sunday,' said Duval, who made birdie on all the par-5s for the second time in three days. 'I feel good standing over the ball.'