ARDMORE, Pa. -- Phil Mickelson began his week with a flight back-and-forth across the country. Even longer might be the 18 holes that now stand between him and that U.S. Open title he has been chasing his entire career.
And he's never had a better opportunity than this one.
Despite a bogey on the final hole of a taxing Saturday afternoon, Mickelson was the sole survivor to par at Merion with an even-par 70 that gave him a one-shot lead over Hunter Mahan, Charl Schwartzel and Steve Stricker going into the last round.
It's the first time Mickelson has held the outright lead through 54 holes in the U.S. Open.
"It's a hard challenge, but it's a lot of fun," said Mickelson, who was at 1-under 209. "Every shot requires such great focus because a penalty can bite you quickly. I can't wait to get back and playing. I feel good ball-striking, I feel good on the greens. I think it's going to take an under-par round tomorrow."
Mickelson already has five silver medals as a runner-up, a record for this demanding major.
Saturday was more about weeding out the pretenders for this U.S. Open -- and one of them turned out to be Tiger Woods. He started out just four shots out of the lead, and made a bending, 12-foot birdie putt on the opening hole. It never got any better for the world's No. 1 player. He made seven bogeys the rest of the way and didn't add another birdie, matching his worst U.S. Open score as a pro with a 6-over 76.
Woods was 10 shots behind.
"It certainly is frustrating," said Woods, who has been stuck on 14 majors since winning the 2008 U.S. Open at Torrey Pines. "I'm playing well enough to do it, and unfortunately just haven't gotten it done."
The final hour might have been a sneak preview for Sunday. At one point, there were five players under par, and suddenly there was only Mickelson.
Luke Donald had the outright lead until two bad swings on the last two holes -- a 2-iron into the bunker on the 17th that led to bogey, and a shot into ankle-deep rough well right of the 18th green that led to a double bogey. Just like that, one of the best rounds of the day turned into a 71, and he was two shots behind.
Hunter Mahan let his spectacular back nine filled with four birdies go to waste with a bogey-bogey finish for a 69. Former Masters champion Schwartzel also went bogey-bogey at the end of his round for a 69.
They were at even-par 210 along with Stricker, who made a 10-foot par putt on the 18th hole to complete the steadiest round of the day. His only mistake in a round that lasted 5½ hours under sunshine was a tee shot into the water on the par-3 ninth for a double bogey. Stricker had a 70.
Billy Horschel, tied with Mickelson at the start of the third round, kept his emotions in check and shot 72. He was two shots behind.