Charles Howell III had a 64 - the best score all week on the South course - and was one shot behind with Peter Lonard (71). Tiger Woods bogeyed his first three holes and his last one for a 72, dropping him three shots behind.
Donald lost in a three-way playoff last year, and showed again that the South course - site of the 2008 U.S. Open - is not just for big hitters. A control player who keeps out of trouble, Donald has made only one bogey all week and went into the final round Sunday afternoon at 14-under 202.
Lehman had to battle for a 73, a round that could have gone either way. He missed five birdie putts inside 10 feet, but made about that many for par or bogey.
Massive fog suspended play the last two days, leaving some players to face 32 holes Sunday.
There was no time to shuffle the groups according to score, so Donald was playing in the threesome ahead of Lehman, Lonard and Woods.
Woods made up a two-shot swing with a 25-foot birdie on the par-5 sixth, while Lehman dumped a wedge from the rough into a bunker and made bogey. That put Woods only one-shot behind the leaders, and he had 245 yards for his second shot on the par-5 ninth.
But he missed the green badly to the left and chopped his way to a bogey to leave himself three shots behind.
Woods wasn't alone in his frustration.
Ernie Els, playing at Torrey Pines for the first time since he was a teenager, was two shots behind until he took a double bogey on No. 7, then followed that with a three-putt bogey on the par-3 eighth. He wound up with a 71 and was at 9-under 207.
Vijay Singh, who started the third round 11 shots out of the lead, was closing fast until his putts stopped falling. He still had a 68 and was at 8-under 208, but then bogeyed three of his first seven holes in the fourth round and slipped nine shots behind.
Phil Mickelson took himself out of contention with a 78 in the third round.
The tournament caught a huge break when crisp morning sunshine bathed Torrey Pines, allowing the third round to resume at 7:30 a.m. and boosting chances there would be a trophy presentation at dusk.
Woods, however, played like he was in a fog.
He was tied with Lehman at 14 under when they returned, but that didn't last.
First, Woods three-putted from about 25 feet on the fringe to take bogey. Then, he put his tee shot into the left bunker on the par-3 16th and left himself no chance, two-putting for bogey. He made it three in a row by missing the fairway with a 7-iron, then missing a 6-foot par putt.
And it could have been worse.
Woods missed the 18th green with a sand wedge and had to save par from 6 feet, then had to made another slippery par putt from 5 feet on No. 1 to save par.
Lehman twice had to grind for par, then twice missed short birdies. He finally got on track with a 6-foot birdie on No. 2, followed by a deft tee shot into 6 feet for birdie on No. 3 to take a four-shot lead.
But the breeze picked up on the fourth, and he caught a plugged lie in the bunker to take bogey. When the leaders stopped for a short break to eat lunch, he was tied with Donald.
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