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Casey missed an eight foot birdie chance on the penultimate hole while his long eagle attempt at the par-5 18 ran six feet past and after watching Casey make his closing birdie to secure outright second, Mickelson made no mistake from a similar distance to close out a -7 65 to complete a three-shot victory. In second is Scott Stallings, who sits at -15 and has finished his tournament.
Phil Mickelson has downplayed suggestions that his win at Pebble Beach on Monday will have any bearing on his chances of completing the career grand slam when the U.S. Open is contested at the same venue in June.
Mickelson is on the verge of winning for the 44th time in his career, and matching Mark O'Meara with five victories at a tournament he first played in 1995.
He also won the Pro-Am with Don Colleran, the chief sales officer for FedEx. "I'll deal with that in six months".
"I can see fine", he said to a PGA Tour rules official as they walked up the 16th fairway.
Making it even more special is Pebble Beach, where he made his pro debut at the US Open in 1992, where he won the first of his five titles in another Monday finish in 1998, this one in August because of rain.
Mickelson had not won on United States soil since the 2013 Phoenix Open.
This was a fantastic win for the 27-year-old, a protege of fellow Aberdonian and former Open champion Paul Lawrie.
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Sam Saunders, whose grandfather Arnold Palmer was among the Pebble Beach owners, scooped up hail and tossed it like a snowball.
Even so, it was the fourth time Casey took a 54-hole lead of at least two shots into the final round on the PGA Tour and failed to win.
Mickelson and Casey were waiting to tee off when clouds moved in quickly moved in, and rain turned into hail that pounded umbrellas, many of them held sideways to account for the wind.
Pebble Beach was so soft that balls were plugging in the fairway when they landed.
The American is on 18 under with two holes left to play, with playing partner Paul Casey on 15 under.
Asked in a greenside interview what the performance did for his confidence, Mickelson said: "Absolutely nothing, because it's nothing like the course we'll see". "This golf course, it looks very gettable [but] it can expose you".
"Sometimes I get in my own bubble", Mickelson said.
Woods posted consecutive rounds of 71 and he needed to post a low number to get near the top of the leaderboard heading into the final day, and while it didn't pan out for Woods, the improvement was impossible to ignore.