Mickelson had a three-shot lead over Paul Casey with two holes to play when it was too dark too finish Sunday night because of delays from rain and a hail storm.
Mickelson was at his best on a course he loves.
Casey returned to the fray today, tapped in his par save at 16 and then preceded to par the par three 17th and birdie the par five 18th but it wasn't enough to reel in Mickelson who also finished 3-4.
For much of the final day, Ormsby's only serious danger had looked to be pre-event [130.0] shot, Brad Kennedy, and the veteran Sydneysider hit a low of [2.1] himself as the pair duelled it out on the back nine but it was all change late on when [1000.0] chance, David Law, rallied superbly after calling a penalty on himself on the ninth.
Mickelson won at Pebble Beach for the fifth time, matching the record set by Mark O'Meara.
Over at the AT&T Pebble Beach Pro Am, a hailstorm halted play yesterday, just before the leaders were due to start their final round.
Mickelson argued that he could "see just fine" on Sunday evening, moments after sunset with two holes remaining.
Hale Irwin, who won the 1990 edition of the US Open at 45 years and 15 days old, is the oldest US Open victor to date so the stats are really against Phil Mickelson, who turns 49 on the Sunday of this year's edition. "Sometimes I get in my little bubble and don't see the bigger picture".
Scott Stallings, who took the clubhouse lead on Sunday by getting to 15 under, was third, with Jason Day and Kim Si-woo tied for fourth at 13 under.
Expanding on why he felt his performance at Pebble Beach boded well for Augusta, the three-time Masters victor said: "The two areas that you have to be at your best to play well at Augusta are you've got to hit the ball long and have a really good short game and those were two areas that were very helpful here".
It also would be his first victory on American soil since the Phoenix Open six years ago. He won that summer's British Open at Muirfield and last year's Mexico Championship. It is where he began his professional career at the 1992 U.S. Open. And while the fairway lines already have been brought in to be much narrower than usual, the rough was light. I would love nothing more than to add to it five months from now, but that's so far down the road.
For years, Mickelson, 48, has rebuffed talk of his age, choosing to focus on aspects that encouraged him going forward even through a four-year stretch without a victory.
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