Arron Oberholser shot a final round even-par 72 to win the Pebble Beach National Pro-Am in Pebble Beach.

It was the first US Tour tournament victory for Oberholser, whose previous best finish was a second at the 2004 Wachovia Championship.

Oberholser won the tournament by five strokes over Rory Sabbatini, who shot a final round 70. Oberholser had rounds of 65, 68, 66 and 72 to collect the £558,000 first-place cheque.

"This is just unbelievable," Oberholser said. "I always dreamt of winning on the PGA Tour, but I never dreamt of winning this tournament. Walking up 18 at Pebble Beach is incredible knowing you are champion. It is pretty special."

For Mike Weir it was another painful reminder of the tournament that has jilted him several times before. Weir now has six top-10 finishes here in seven years, including a second-place finish last year.

This finish might be his most painful. It was uncharacteristic of Weir, who is usually known for his consistent play. He finished with a six-over 78, dropping to 11 under and a tie for third.

"I am not going to lie to you, I thought I was going to win," Weir said. "No question. For some reason it wasn't meant to be. It is frustrating, real frustrating."

The tournament was pretty much over by the third hole. On the par-five second, Oberholser made a five-foot birdie while Weir hit his approach shot out of bounds and settled for a double-bogey.

The three-shot swing rattled Weir, who made a bogey on the following hole, while Oberholser made a nine-foot birdie for a five-stroke lead.

The 31-year-old from Northern California did make two mistakes on the front nine. The first was a bogey on the fifth hole when he missed a four-foot par saving putt.

But Oberholser stopped any potential momentum swing on the ninth hole. He hit his drive into the bunker and had to lay up. His shot left him 98 yards, but his wedge shot fell short of the green. He chipped from the front of the green to six-feet and drained the putt to minimise the damage with a bogey.

Oberholser certainly was not content to sit on the four-stroke lead. On the back nine he continued to play aggressive and one hole typified the day for both he and Weir.

On the 10th hole Oberholser fired at a flag that was tucked onto the right front of the green, despite the Pacific Ocean bordering the green that sits on a cliff. Oberholser just missed the 11-foot birdie putt and settled for par.

Weir's approach shot was in the middle of the green, 35-feet away. His birdie attempt went 10 feet by the hole and he missed the comeback par putt.

Oberholser did his best to make it interesting. With a six-stroke lead with six holes to play, he made two consecutive bogeys to drop the margin to four with four holes remaining.

Sabbatini tried to catch Oberholser, but found it difficult to make up the seven strokes, getting as close as four on the back nine.

"I got off to a good start and things just slowed down from there," Sabbatini said. "It was one of those things where I just hit a couple of wayward shots and put myself in the wrong positions and went backwards.

"When you do that with as large a lead as he had, you kind of take yourself out of any running."

It looked like the door might open a little when Oberholser pushed his drive left off the 15th tee. The ball hit the cart path twice before settling near one of the newly planted trees on the right side of the rough. His approach from 105 yards came to rest seven feet from the hole and he made the putt to increase the lead to five.

He made par on the final three holes, including an up-and-down from a trap on the 17th hole. Oberholser made an 18-foot birdie to save par. It was the sixth sand save of the week for him.

Collated final scores and totals in the USPGA Tour AT&T Pebble Beach National Pro-Am, Pebble Beach GC, United States of America

(USA unless stated, par 72):

271 Arron Oberholser 65 68 66 72

276 Rory Sabbatini (Rsa) 69 69 68 70

277 Jonathan Byrd 69 65 74 69, Mike Weir (Can) 63 67 69 78

278 Daniel Chopra (Swe) 71 67 69 71, Craig Barlow 69 68 72 69

279 Nick Watney 65 71 70 73, Brian Davis (Eng) 66 72 68 73, Tom Lehman 72 65 72 70, Vijay Singh (Fij) 68 71 72 68, Luke Donald (Eng) 62 72 71 74

280 Tim Clark (Rsa) 66 71 70 73, Paul McGinley (Irl) 71 68 71 70

281 Chris DiMarco 68 69 73 71, Steve Stricker 69 71 73 68, Bo Van Pelt 67 71 71 72, Pat Perez 69 71 70 71, Jose-Maria Olazabal (Spa) 71 67 72 71, J.L. Lewis 67 74 70 70, Joe Ogilvie 70 71 69 71, Hunter Mahan 68 73 67 73, Michael Allen 65 71 77 68

282 Jason Bohn 71 69 72 70, Briny Baird 70 71 72 69, Ryan Palmer 69 71 68 74, John Senden (Aus) 72 69 68 73

283 Troy Matteson 68 73 70 72, Jim Furyk 68 71 74 70, Duffy Waldorf 69 73 70 71, Steve Flesch 69 72 71 71, Mark Wilson 68 68 71 76, Will MacKenzie 70 69 70 74

284 Jerry Smith 69 68 73 74, Alex Aragon 68 69 73 74, Davis Love III 69 67 75 73, Vance Veazey 71 69 71 73, Shane Bertsch 72 70 70 72

285 Phil Mickelson 67 74 67 77, Fredrik Jacobson (Swe) 67 67 74 77, Brendan Jones (Aus) 67 71 74 73, Parker McLachlin 71 69 71 74

286 Robert Garrigus 68 69 74 75, Craig Stadler 68 74 69 75, Jon Mills (Can) 71 67 72 76, Darron Stiles 66 71 73 76, Brian Bateman 68 73 72 73, Steve Lowery 70 74 67 75, Charles Warren 67 75 71 73, Mark Brooks 67 75 71 73, Jeff Maggert 71 69 72 74, Jason Gore 70 73 70 73, Lee Janzen 69 73 66 78

287 Jay Williamson 69 73 70 75, John Cook 67 70 73 77, Harrison Frazar 67 72 67 81

288 Paul Stankowski 69 75 68 76, Cameron Beckman 69 70 74 75, Bob May 71 67 74 76, Jeff Sluman 71 67 73 77

289 Billy Andrade 70 73 70 76, Dean Wilson 68 70 72 79, Charles Howell III 68 76 69 76, Peter Jacobsen 70 69 73 77

290 Charley Hoffman 68 70 74 78, Brett Wetterich 71 73 69 77

291 Brad Faxon 68 71 74 78, Bubba Dickerson 73 69 71 78