Paul Casey leads by 3 over Phil Mickelson at Pebble Beach

PEBBLE BEACH, Calif.

Casey had four birdies over his last 10 holes at Spyglass Hill in a mixture of rain, sunshine and wind. He finished at 15-under 200, the fourth time on the PGA Tour had he has led going into the final round.

"I am having a blast," Casey said.

Mickelson was part of the celebrity rotation at Pebble Beach and put on a show on the back nine, stuffing a wedge to 3 feet on No. 13, and following with a 4-iron to 4 feet on the par-5 14th hole for eagle. He also made a tough save on the par-3 17th and shot a 2-under 70, giving him a good chance to match Mark O'Meara's record of five AT&T Pebble Beach titles.

Casey and Mickelson have done their best with so many shots to back pins, typically set to the highest point on the three courses to avoid any saturation from the hit-and-miss rain.

"The little half-shots to get back to some of these pins, a lot of guys struggle with and it's been a strength of my game," Mickelson said. "So I've been able to make a few more birdies on some of these holes."

The weather again was hit-and-miss, though the tournament managed to get in 54 holes.

That's not what stopped Jordan Spieth.

He was tied for the lead after a birdie on the par-3 fifth hole and remained in range of Casey until Spieth pulled his tee shot so badly on No. 13 that he didn't know where it was until it was spotted 140 yards behind where he was looking, under a cluster of trees. He made double bogey, and then after a three-putt bogey from the wrong side of the 17th green, Spieth pulled his tee shot into the ocean on the 18th hole for another double bogey and a 74. He went from being in the mix to eight shots behind.

"It was going to bite me at some point," Spieth said. "I didn't necessarily deserve to be a couple under par at the time, and so it ended up kind of haunting me there. ... I drove the ball well the last two days, and then today my driver just didn't behave at all."

Lucas Glover had a birdie-bogey finish at Monterey Peninsula for a 1-under 70 and was at 11-under 204, along with Scott Piercy (69 at Spyglass Hill).

Fifty-four hole leads have not been friendly to Casey. He is 0-3 with the lead going into the final round on the PGA Tour.

Now he has Mickelson, who three weeks ago finished one shot behind in the Desert Classic. Mickelson had consecutive bogeys as the wind and rain were at its worst along the coastal holes of Nos. 9 and 10, and then recovered brilliantly.