"It just rolled over in like a heel print or something," Mahan said. "I didn't feel like I moved it. I didn't feel like I had anything much to do with it moving. It's just a rub of the green, so had to go back and take a penalty. That was frustrating, because I was hitting it so good."
Mickelson was equally frustrated by throwing away some careless shots. While he was tied for 39th, Mickelson didn't feel out of contention.
"I love Pebble Beach. I've played well there and I'm only one good round away," he said. "If I can shoot something in the mid-60s, I'll be right there for Sunday's round, which is what I care about."
Mickelson was six shots behind going into the final round last year when he won. That was against Charlie Wi, still searching for his first tour win. At the top now is Snedeker, the second-highest ranked American behind Woods who is averaging 66.5 in his last eight rounds.
DIVOTS: Geoff Ogilvy's hopes of qualifying for the Match Play Championship took a big hit when he twice missed par putts inside 2½ feet and three-putted for par from 25 feet on the sixth hole at Pebble. He had a 74 and was tied for 108th. He likely needs to finish fifth to move into the top 64. ... Lee Westwood, in his Pebble Beach National Pro-Am debut playing with his father, had a 70 at Monterey Peninsula and was four shots behind.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.