Mickelson shot a bogey-free 65 in the final round at Pebble Beach, erasing a three-shot deficit to beat Paul Casey by three shots.
The popular lefthander has been a US Open regular since Irwin's victory nearly 29 years ago and he's finished second an incredible six times in the event.
It was a decision Mickelson clearly disagreed with, visibly shaking his head when the horn blew to officially halt play.
Casey has never won in three previous times he had a 54-hole lead on the PGA Tour, all of them by two shots or more, and he was holding his own against the relentless pursuit of Mickelson, who missed three straight birdie putts from the 12-foot range by the slimmest margins.
Casey birdied the 18th for a 71 to finish alone in second, and he won the pro-am portion of the tournament. I can see fine, and I'm playing well, so I wanted to continue and that's all there is to it.
With a two-hour rain delay in Sunday's final round, Day was one of the last groups to finish before sunset and carded a four-under-par 68. The greens were beat up (on Sunday). Casey could barely see the 3 feet of grass between his ball and the cup on the 16th hole and said there was no way to complete two holes in six minutes.
"I really don't think there is any carry over to the US Open", Mickelson said, after finishing par-birdie in a Monday finish at a soggy Pebble Beach to win his 44th PGA Tour title on 19-under par and pass the $90 million mark in career earnings.
"I get where Paul is coming from", Mickelson said.
"I take a lot from this", Casey said.
"So at the end of a year ago, even though I played poorly, I had something happen where it seemed like overnight - it had really been in the works - where my driver speed shot up 5, 6 miles an hour, which rarely ever happens to anybody, let alone somebody in their late 40s", he said.
"The rough will be so different and the greens so firm it will be a whole different golf course but I'll deal with that in six months".
Mickelson needs to win the US Open to complete the Major Grand Slam and with Father Time accelerating along, playing this year at a venue that he knows so well and that he plays so well, offers him a chance.
His path to victory these days is never going to be mundane, even in a tournament where he went an entire round without missing a fairway - a 20-year first.
Belcalis Almanzar became the first woman to ever win a Grammy as a solo rap act (Lauryn Hill won in 1996 as part of The Fugees). We was like, 'We have to get this album done so I could shoot the videos while I'm still not showing.
Fellow goalkeeper Neville Southall added: "RIP Gordon Banks A incredible keeper and it was a joy to have met and worked with him". But the 1966 World Cup victor would always share a joke with his old friend over his part in Pele's unique World Cup story.
Los Angeles-Kylie Jenner and Travis Scott threw a lavish " Stormi World" themed party for their daughter on Saturday (09.02.19). Kylie's follower Rachel Beckett asked, 'I want to know what happened to Norman and I want to know now'. "Not that I'm aware of".
But we'll pause there, if only to save our breath for the latest award show drama - this time, concerning the Grammys . The first time they dressed her for the red carpet was at the 2018 Grammy Awards where she wore a Armani Privé gown.
In other words, her anti-Semitic convictions are so damned deep, it takes only one word to communicate them. The letter's authors, who are both Jewish, did not mention Omar by name, but their intent was clear.
Fairfax answered: 'I knew that because of what happened to you past year , you'd be too afraid to say anything.' Mr. Sometimes known as the "Cradle of America", Virginia was home to four of the country's first five presidents.
She sang classics like " Do You Love Me " while donning several outfits in an act with Smokey Robinson and others. But bad news for fans outside the United States as she will sadly only be performing in the US.
But Defense Minister Vladimir Padrino announced that the armed forces were deploying a "reinforced presence all along the border". Two weeks ago, the regime-loyalist Supreme Court barred him from leaving the country and froze his assets.
Unconfirmed reports say the death toll is likely to rise as numerous injured jumped from the burning building to the ground. Mandeep Singh Randhawa, deputy police commissioner, said authorities are still investigating what sparked the fire.
Brad Pitt shows up at Jennifer Aniston's 50th birthday bash
Aniston met Pitt in 1998 and they dated for two years before they married in 2000, becoming a high-profile couple in Hollywood . Entertainment Tonight claims Brad spent most of his time chatting to his Ocean's 11 co-star George Clooney during Jen's party.
Meghan Markle Is Glowing in Latest Outing With Prince Harry
Meghan laughed as a relative of one of the children showed her a photo on her phone, zooming in on the image to get a closer look. Kensington Palace previously revealed that there is no truth to some of the rumors being directed at the Duchess of Sussex .
Antonio Brown Has Decided On His Future With The Steelers
NFL Network's Ian Rapoport reported last month that the Broncos may be among the teams to make a run at Brown this offseason. With over $107 million in cap space right now, the Colts can add literally anyone they want to via free agency (or a trade).
The Trailer For The Live Action Aladdin Is Finally Here
Aladdin , which also stars Mena Massoud ( Aladdin ) and Naomi Scott (Princess Jasmine) will debut in theaters on May 24 , 2019. Even though there are mixed reactions to Smith as a blue Genie , there is no doubt fans are excited for the film itself.
Backed Kurds launch final attack against IS in Syria
He said that when the SDF detects movement from IS fighters, they bomb them, but added: "There have not been any major changes". The regime has made a military comeback with Russian military support since 2015, and now holds nearly two-thirds of Syria.