By Mike McAllister, PGATOUR.COM

IRVING, Texas -- Sang-Moon Bae was in control of the HP Byron Nelson Championship after eight holes on Sunday. But as the final group makes the turn, it might be Keegan Bradley who has the momentum.

Bae was enjoying a four-shot lead thanks to a superb putting display early Sunday. But an errant tee shot, followed by an approach shot that found the water, left him with a double bogey at the par-4 ninth.

Meanwhile, Bradley -- the 54-hole leader who had seen Bae sprint past him on the front nine -- made a clutch 14-1/2 foot par-saving putt that left him pumping his fist after the ball dropped. That left Bradley at 12 under while Bae dropped to 14 under.

Bae made putts of 26 feet, 7 inches at the third; 22 feet, 1 inche at the fifth; and 11 feet, 4 inches at the eighth to grab the lead. The second-year pro is seeking his first PGA TOUR win.

By Mike McAllister, PGATOUR.COM

IRVING, Texas -- Jason Dufner was hoping a return to the TPC Four Seasons Resort, where he won the HP Byron Nelson Championship a year ago, would jump-start his season.

It didn't happen.

Dufner finished a frustrating four days at 1 under and will leave Las Colinas still seeking his first top-10 of the season. Dufner's best finish this year in 12 starts is a tie for 12th at the World Golf Championships-Cadillac Championship.

"It's just not much fun playing golf right now the way I'm playing," said Dufner, who is scheduled to play in next week's Crowne Plaza Invitational at Colonial, where he finished second last year to Zach Johnson.

Dufner hit just 46.4 percent of his fairways this week, includng five of 14 on Sunday. He also struggled with his putting, needing 123 putts over the four rounds.

Asked what his main issues are, Dufner replied, "Pretty much everything.

"Can't score, so that's the name of the game out here. You got to make birdies and save pars when you can, and I can't do it, so very frustrating time for me right now, golf-wise."

By Mike McAllister, PGATOUR.COM

IRVING, Texas -- With the final twosome of tournament leader Sang-Moon Bae and Keegan Bradley soon to make the turn, here is how the top three players currently on the HP Byron Nelson Championship leaderboard have fared on the back nine in the first three rounds.

Watch Bae birdie the third hole in Sunday's final round.

By Mike McAllister, PGATOUR.COM

IRVING, Texas -- For the first time in three days, someone other than Keegan Bradley leads this week's HP Byron Nelson Championship.

A two-shot swing at the 502-yard par-4 third has moved Sang-Moon Bae into the lead at 13 under.

Bae rolled in a 26-foot, 7-inch birdie putt while Bradley was making bogey after his tee shot found the water down the right side of the fairway. That dropped Bradley to 12 under.

The next closest pursuers are Charl Schwartzel and Scott Piercy, who are both at 9 under. So Bae and Bradley could be making this a two-man show.

Bradley has led this tournament ever since posting a course-record 10-under 60 on Thursday morning. He's seeking to become the first wire-to-wire winner at the HP Byron Nelson since Tom Watson in 1980.

UPDATE (2:55 p.m. ET): Sang-Moon Bae now holds a three-shot lead after birdies at the par-3 fifth and par-4 sixth. That moves him to 15 under, with Keegan Bradley at 12 under.

Click here to follow Sang-Moon Bae's final round on Shot Tracker

By Mike McAllister, PGATOUR.COM

IRVING, Texas -- Keegan Bradley will soon play the par-5 seventh, one of two par 5s at TPC Four Seasons Resort. He has feasted on those two holes at this week's HP Byron Nelson Championship.

Bradley is a cumulative 7 under on the par 5s -- the seventh and the 16th -- through his first three rounds, with five birdies and an eagle on his six attempts. His eagle came at the seventh hole when he drove the green in two and made a putt from just outside 10 feet. That happened in the first round en route to his course-record 10-under 60.

No player in the field this week has performed better on the par 5s.

Of course, it's no surprise that Bradley has taken advantage of the par 5s. He ranks tied for third on the PGA TOUR in par-5 scoring average with a 4.50 average. Tiger Woods is first at 4.36 with Justin Rose second at 4.41.

Click here to follow the remainder of Bradley's round on Shot Tracker

IRVING, Texas -- With the final twosome now having started their final round, the hottest players on the course are Morgan Hoffmann and Charley Hoffman, each at 4 under on their rounds.

Hoffman has two birdies and an eagle at the par-5 seventh and has just made the turn.

Hoffmann has five birdies, including at the 10th and 11th holes to bounce back from a bogey at the ninth.

Each player is at 8 under, currently five shots off the lead held by Keegan Bradley. With windy conditions expected for the rest of the afternoon, an early low score could look pretty nice at the end of the day.

Ricky Barnes currently has the low score of all finishers thus far, shooting a 4-under 66 to finish at 5 under.

Scott Piercy has won a TOUR event in each of the last two years. (Redington/Getty Images)

By Mike McAllister, PGATOUR.COM

IRVING, Texas -- Scott Piercy has just teed off to begin his final round at the HP Byron Nelson Championship. Starting three stokes behind Keegan Bradley, Piercy is seeking his third PGA TOUR win in as many years.

He knows he needs to be aggressive on Sunday in order to catch Bradley. But he also knows he'll need to pick his spots at the TPC Four Seasons Resort.

"It's more defense on this golf course than offense," Piercy said. "You can make a lot of bogeys, and it doesn't give you a lot of birdies because because you have awkward lies in the fairways with cross winds and pins that are tucked. It's hard to get the ball close."

Piercy didn't need to get the ball close in shooting a 4-under 66 on Saturday, making two birdie putts outside 45 feet and another outside 30 feet. If his putter remains hot on Sunday, he'll have a chance.

"Going to play steady golf (Sunday) and take my birdies where I can get 'em and eliminate the bad stuff," Piercy said. "If Keegan doesn't run away and hide, I might have a chance."

Piercy has shot 66-68-66 to get to his 10 under total through three rounds. He figures another 68 in the tough conditions Sunday might do the trick.

"If the wind is going to be up as much as they say it's going to be, there is going to be a lot of defense," Piercy said. "So a couple under (Sunday) could go a long ways."

IRVING, Texas -- Louis Oosthuizen has withdrawn from the HP Byron Nelson Championship before Sunday's final round because of a neck issue.

The 2010 British Open champion was at 3-under 207 and tied for 32nd place after shooting even-par 70 in the third round.

Oosthuizen entered the HP Byron Nelson with the No. 7 world ranking, the highest-ranked player in the field. He had missed the cut in his only other appearance in this event.

Michael Bradley also withdrew Sunday morning with a back problem. Bradley was 2 under.

Oosthuizen is also set to play in next week's Crowne Plaza Invitational at Colonial. Bradley is not on the field list for that invitational tournament.

Since 72 players made the secondary cut after three rounds, Oosthuizen and Bradley will get paid equal to a 71st-place finish at the Nelson. - Associated Press

Keegan Bradley (left) and Tom Gillis were in the same group on Saturday but have different tee times for Sunday's final round. (Pennington/Getty Images)

By Mike McAllister, PGATOUR.COM

IRVING, Texas -- Tom Gillis wants nothing better than to overtake Keegan Bradley and win his first PGA TOUR event in Sunday's final round of the HP Byron Nelson Championship.

But that doesn't mean the 44-year-old Gillis, who starts the round two shots off the lead, isn't a big fan of Bradley. The two practice and play out of the same club in South Florida, and on Saturday, Gillis got his first up-close look at Bradley in a TOUR event as one of his playing partners.

"He's the 'new breed,' I call it. Very powerful," Gillis said. "That's the future of the game. He's one of the best players out here, there is no doubt.

"I've played with a lot of them, but this is the first time I've played with him in a tournament, and it's there. He's got the grit. He wants to do it. The sky is probably the limit."

The 26-year-old Bradley is seeking his fourth TOUR win and second HP Byron Nelson title on Sunday. 

Here's a quick rundown of the final two groups Sunday at the HP Byron Nelson Championship:

1:30 p.m. ET

Keegan Bradley (13 under): Gunning for second win at TPC Four Seasons in three years. Beat Ryan Palmer in a windy, dry playoff in 2011 for his first career win. Made a ton of birdies this week (19 in only 54 holes) but he's also made eight bogeys.

Sang-Moon Bae (12 under): Second-year PGA TOUR player; got card at 2011 q-school. Good rookie year in 2012, with over $1 million earned and two top-10s. Shot a trio of 66s this week, with only four bogeys. Best finish this year was a T8 at Northern Trust Open. This is his first start at TPC Four Seasons.

1:21 p.m. ET

Tom Gillis (11 under): Gillis, 44, has never won on the PGA TOUR. He tied for second at the 2012 The Honda Classic, when Rory McIlroy and Tiger Woods battled for the win on the final day (McIlroy won). Has just one bogey on the front nine this week, and his experience should help him in Sunday's windy conditions. 

Scott Piercy (10 under): Erratically brilliant player who can make birdies in bunches. Already has two wins on TOUR in 139 starts, and he's among the longer hitters on TOUR, which doesn't hurt on TPC Four Season's long par-70 layout. Tied for 15th here last year after shooting par or better in every round. Sank three long putts Saturday to shoot 67.