Adam Scott didn't have to look at the leader board to know he wasn't alone at the top. Not the way he was scrambling after such an impressive start.

"I might have been able to get out there a few shots clearer," Scott said. "I certainly played well enough to, but kind of ran into some troubles on the back nine."

After four birdies, Scott's problems began at No. 9, where he actually had an impressive recovery for a bogey. But he had three more bogeys over the last seven holes in a round of 1-under 69 yesterday that was just enough to keep him in a share of the lead at the Byron Nelson Championship.

Trevor Immelman had a bogey-free 64 on the TPC course at Las Colinas in Irving, Texas, to match Scott at 11-under 199. Immelman was in contention again a week after losing a playoff to Jim Furyk in the Wachovia Championship.

"There were so many positives that it really would have been silly of me to think of it in a negative fashion," Immelman said. "I came here knowing that I was playing well. My goal was just to try to play well again."

Scott tied for the lead for the third consecutive day, each time with someone different.

Brett Wetterich (70) was a stroke back at 200. Charley Hoffman (65), Chad Campbell (65), Joe Ogilvie (69) and Omar Uresti (69) were tied for fourth at 202.

Immelman had a chance to catch Scott at the 196-yard 17th, but his 13-foot birdie putt slid right of the hole and he remained 11 under.

Scott was then at No. 15, where he missed the fairway and the green. But he saved par after chipping 7 feet past the pin.

Then when Scott got to 17, after Immelman's round was over, he put his tee shot in a bunker fronting the green. Scott blasted to 6 feet, but pushed the par putt a foot past the hole.

"I knew there were birdies out there because I had made a few, so I knew someone else must be going all right," said Scott, who had a four-stroke lead early in his round.

"But I hit some tee shots that really prevented me from getting near the hole."

Scott had four birdies the first eight holes, starting with a 4-footer at 192-yard No. 2 hole.

Even after missing the fairway at the 533-yard seventh, Scott punched a shot back into the fairway and hit an approach to less than 4 feet, and got to 14 under after a birdie at No. 8.

"I hope I get in that position tomorrow, and hopefully close it off," Scott said. "But I feel comfortable in the position I'm in."

Scott, the 25-year-old Australian who two years ago became the youngest winner of The Players Championship, has led after 54 holes three previous times. He had the outright lead each time, and won each time.

A 54-hole leader has won 16 of 18 PGA Tour events this year.

Other tournaments

Michelob Ultra Open: Karrie Webb shot a 5-under 66 to take a five-stroke lead after the third round in Williamsburg, Va. A day after top-ranked Annika Sorenstam missed the cut in an LPGA Tour event for the first time since 2002, the resurgent Webb moved to 12-under 200 on the River Course at Kingsmill. Lorena Ochoa (65), Pat Hurst (69) and defending champion Cristie Kerr (70) were tied for second at 8 under.

Boeing Championship: Bobby Wadkins followed his course-record 62 with an even-par 71 to take a three-stroke lead over Craig Stadler and John Harris after the second round in Destin, Fla. Wadkins, winless on the Champions Tour since 2001, had three birdies and three bogeys to finish at 9-under 133 total on The Raven Golf Club course.

British Masters: Paul Casey shot a 2-under 70 for a two-stroke lead over Michael Campbell after the third round at Sutton Coldfield in England. Casey entered with a three-stroke lead after two bogey-free rounds. He bogeyed the third and last holes but added five birdies to stay in front of Campbell, the U.S. Open champion, who shot 68. Casey is at 13-under 203. Darren Clarke birdied the last hole for a 70 to hold third place.