AUGUSTA, Ga. (AP) — Lee Westwood is the leader going to the final round of the Masters after shooting a 4-under 68. That leaves him one stroke ahead of Phil Mickelson.

Lefty caused the biggest stir Saturday by becoming only the third golfer in Augusta National history to make back-to-back eagles. He missed an unprecedented third straight by just 6 inches. Mickelson shot a 67 to earn a spot in the final pairing with Westwood on Sunday.

Tiger Woods had an inconsistent round, but rallied for his second straight 70. He is only four strokes off Westwood's pace, a 12-under 204. K.J. Choi is also at 208, with 50-year-old Fred Couples another stroke behind.

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AUGUSTA, Ga. (AP) — Lee Westwood appeared to be pulling away, the only player on the Masters leaderboard heading in the right direction Saturday.

Then, just like that, Phil Mickelson turned Moving Day upside down.

Lefty became only the third player in Augusta National history to make back-to-back eagles — and came within 6 inches of pulling off another one — stealing the lead from Westwood with one of the most remarkable three-hole stretches this ol' place has ever seen.

They were roaring on the back nine as loud as ever — and it wasn't even Sunday.

"You don't plan on balls going into the hole like at 14," Mickelson said. "I haven't played this well in a long time. I feel my game is as good as it's been. I love this tournament more than any other. I love being in contention on Sunday."

Mickelson wiped out a five-shot deficit to make himself a prime contender for a third green jacket. He stumbled a bit with a three-putt bogey at No. 17, but managed to get up and down after missing the green at the final hole for a 5-under 67.

He had an 11-under 205 through 54 holes, good enough for the clubhouse lead. Westwood was at 12 under with one hole to play, reclaiming the top spot on the scoreboard with a two-putt birdie at the 15th.

No matter who was leading at the end of the day, this round figured to be remembered for Mickelson's dazzling play on the back side.

It started at the par-5 13th, where he reached the green in two shots, then rolled in an 8-foot putt for eagle.

The next hole was really extraordinary. From 139 yards away, in the middle of the fairway, he struck a 9-iron that plopped down left of the flag and spun back into the cup for a 2. He joined Dan Pohl (1982) and Dustin Johnson (2009) as the only players to make consecutive eagles at the Masters.

How about three in a row? Mickelson sure gave it a run, knocking a wedge over the pond at the par-5 15th, the ball nuzzling the hole while the patrons tried to will it home with their cheers.

Mickelson was beaming as he walked up to the green for the tap-in birdie that gave him his first outright lead of the tournament.

Tiger Woods, meantime, was hurt by a shaky putter and some loose shots off the tee.

"Tiger, you suck," he said to himself at one point — the sort of outburst he had vowed to tone down in his return to the game after a five-month layoff due to a sex scandal.

Then, Woods ripped off three back-to-back birdies over the same stretch of holes that Mickelson dominated. A wild drive off the 17th tee led to his fifth bogey of the round, but he came back with a brilliant approach shot at the final hole for a birdie that gave him his second straight 70 and 208 overall.

"I was fighting it all day," Woods said. "I really struggled with the pace of the greens. I was fighting my swing. It was a tough day."

But he was right in the mix heading to Sunday, three shots behind Mickelson. K.J. Choi was also at 208.

"I just wanted to put myself in contention, and I did that," Woods said. "If I have a good round tomorrow, you never know."

Fifty-year-old Fred Couples, who led after the first round, bounced back from a disappointing 75 on Friday with a birdie at the 14th and a chip-in eagle at 15 on his way to a 68. He climbed into fifth place, four shots behind Mickelson, and at least has a shot at becoming the oldest winner in Masters history.

"I hit the ball extremely well today — 68 is a very good score," said Couples, who deals with chronic back problems by wearing tennis shoes and no socks. "I have a shot tomorrow if I can shoot a crazy score. We'll see what happens."

Ian Poulter started the day tied with Westwood tied for the 36-hole lead but went the wrong way. He was 2 over through 17 holes, going from the top spot to 6 under in a tie with Ricky Barnes (72) and Hunter Mahan (68).

"There's a long way to go," Woods said. "It's only Saturday."

Copyright 2010 The Associated Press.