No doubt, Mickelson wanted to get home to Southern California on Sunday night, and he clearly wasn't concerned about squandering a chance at victory because he couldn't see what he was doing.
It's his 44th career PGA Tour title, and fifth at Pebble Beach, tying Mark O'Meara for most in the event's history.
He drilled a 7-iron into eight feet on the par-3 17th and made par, and then played conservatively up the par-5 18th and finished with a 6ft birdie for a three-shot victory.
"I believe that if I play my best, if Tiger plays his best, it's good enough to win on any week", said Mickelson.
The American is on 18 under with two holes left to play, with playing partner Paul Casey on 15 under. The greens were beat up. Mickelson was on the 17th tee, shaking his head when he heard the siren to stop play. "I don't want to put Paul in a bad spot".
He finished at 19-under 268, while Englishman Paul Casey (71) birdied the final hole for second place on 16-under.
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Mickelson had not won on U.S. soil since the 2013 Phoenix Open.
"It's been a treat this week", said Casey, who had entered this week with two weeks of rest after a tie for second at the Singapore Open on the Japan Tour. Mickelson marked his ball all week with a silver coin given to him by his grandfather, Al Santos, one of the original caddies at Pebble Beach in 1919.
With light fading, Mickelson was keen to finish the round, saying: "I can see fine" but England's Casey opted not to putt on the 16th. He won the British Open that summer in Scotland, and the Mexico Championship previous year.
The course will be completely different in June, with the rough taller and the greens firmer and no amateurs to take the edge off the proceedings. A terrible tee-shot was followed by a chip that failed to find the green and a third that wasn't much better and after a fast start, which had seen him birdie the first two holes and three of the first five, and following a run of 11 straight pars, the 38-year-old Aussie missed his bogey attempt and tapped in for a double-bogey five. "I need to do something special". "I just get in my own little bubble and I don't see the big picture".
Scot Russell Knox closed at nine under after a fourth-round level-par 72, one shot clear of Northern Irishman Graeme McDowell.
His first one also was a Monday finish, when players returned in August - more than six months later - to finish the third round of the weather-plagued tournament to make it official.