By Doug Ferguson

CARLSBAD, Calif. (AP) _ While there's no such thing as an upset in the Match Play Championship, Mike Weir might feel otherwise.

The former Masters champion was 4-up with four holes to play against Geoff Ogilvy when he missed a 10-foot par putt on the 15th to lose the hole.

No big deal, right?

But the Aussie birdied the 16th, won the 17th with a par and the 18th with a two-putt birdie. Ogilvy went to extra holes for the third straight round, and won on the 21st hole with an approach to 4 feet for eagle on the par-5 third.

``That was the best thing I ever saw, that 19th tee,'' Ogilvy said. ``I shouldn't have won today.''

Chad Campbell, meanwhile, expected overtime against Tiger Woods.

Standing to the side of the 18th green with a 1-up lead, he was so certain that Woods was going to make a 12-foot birdie _ doesn't he always? _ that Campbell already was planning his tee shot on the first extra hole.

Imagine his surprise, not to mention his delight, when Woods missed his putt.

``I wasn't really all that disappointed,'' Campbell said with a grin.

Instead of walking over to the first tee, he watched Woods and an entourage of security climb the stairs toward the clubhouse and check out of La Costa Resort.

Good thing Woods didn't shut the door on his way out.

Minutes later, hometown favorite and fifth-seeded Phil Mickelson lost to David Howell of England, leaving Lefty winless on the West Coast for only the fourth time in his career.

In the next group was Vijay Singh, the No. 2 seed, limping along against Padraig Harrington until the Fijian frittered away enough chances to lose on the 19th hole.

Defending champion David Toms, the No. 8 seed, saw his eight-match winning streak end against Ryder Cup captain Tom Lehman in the shortest match of the third round.

Chris DiMarco was the No. 7 seed and said he doubted there were many players at La Costa with his toughness. What he discovered was that match play starts with birdies, and he only made one in a 3-and-2 loss to Davis Love III.

Six of the top eight seeds had reached the third round. Retief Goosen was the only one left after another high-charged day at La Costa. Goosen, the No. 3 seed, never trailed in beating Luke Donald, 1-up. Not only is he the only top seed remaining, Goosen is the only player who has not trailed at any point through three rounds.

Not that it means anything.

``I don't think anybody of the eight that are left are going to be wishing Tiger was here,'' Love said. ``You never know who is the hot player, who's the guy with the hot putter. It's still match play.''

``I didn't play badly,'' Woods said. ``Chad played really good. He made a lot more birdies than me, make more putts than I did. I had my opportunities to put pressure on him by making putts, and I didn't do it.''

Campbell made a 20-foot birdie on the 10th to go 3-up, but the momentum didn't last long. Woods chipped in for eagle on the 11th, and won the 12th when Campbell missed the par-3 green to the left and failed to save par.

``When you've got a 3-up lead through 10, that's a pretty good lead,'' Campbell said. ``Standing on the 13th tee only being 1-up, you're pretty disappointed.''

But he came through in a big way, hitting an 8-iron that stayed on the top shelf, eight feet away, and making the birdie to restore his margin. Despite a double bogey on the 14th, he only lost a hole, not the lead. And he kept that lead to the very end until Woods was forced to produce a birdie he didn't have.

Woods' tee shot sailed far to the right into the rough, leaving 244 yards to the front of a green protected by a small creek. He didn't have much of a choice.

``I couldn't hardly see him through the gallery,'' said Campbell, whose tee shot found a bunker and forced him to lay up. ``I was expecting to see something come out of the gallery and onto the green.''

Not on this day.

Woods even had the advantage of getting a read off Campbell's 25-foot birdie putt, so much on the same line that Woods had to move his marker. That didn't help, though, as Woods' putt bounced from the start.

Campbell next faces Lehman, still three matches away from winning, but feeling like he picked up a big victory by taking down Woods.

``The tournament is not over yet, just because you beat one guy,'' Campbell said. ``It's definitely an accomplishment and I'm proud of myself for grinding it out and playing so well under pressure against the No. 1 player in the world.''

Not many have experience pressure like Ogilvy, who won at Tucson a year ago this week when he wasn't eligible for the World Golf Championship. He birdied the 18th and 19th holes to beat U.S. Open champion Michael Campbell on Wednesday, went 21 holes against Nick O'Hern on Thursday and figured he was in for a short day against Weir.

``Walking up 15, I wasn't very happy with the way it all sat,'' Ogilvy said. ``I didn't think I had any chance, but I didn't give up. I thought even if I birdied the last four holes, I'm not going to do it.''

Now he faces Howell, who is blossoming into Britain's best. Howell scored a big victory in Shanghai last year by going head-to-head against Woods on the weekend to beat him. And he took down Mickelson on Friday.

``If you stand up to Tiger ... it would be strange to be intimidated by anybody else,'' Howell said.