CBS will provide live coverage of the event via its website, with coverage starting at 11 a.m. ET and continuing until play is finished.
This was Mickelson's fifth AT&T title so it's fair to say he was a tournament specialist before this week but he was still generally a [36.0] chance and he even hit a high of [50.0] before the off. Casey, who traded at a similar price to Lefty pre-event, hit a high of [80.0] and a low of [1.5] in-play.
Casey has a four-foot putt to save par on the 16th green when play resumes at 8am (4pm GMT) on Monday, while Stallings holds the clubhouse lead on 15 under after a six-under 66. Casey said there was no way to finish and they had to return Monday morning.
The American is on 18 under with two holes left to play, with playing partner Paul Casey on 15 under.
The victory, Mickelson's first since the WGC-Mexico Championship last March and first on USA soil in six years, carries special significance for him.
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.
"I thanked Paul this morning for letting us finish in the morning", he told the Golf Channel, admitting that he had been in his "little bubble" and self-centered. It also moved him up 12 spots in the world rankings to No. 17 - one spot higher than he reached with last year's win at the WGC-Mexico Championship and his best world ranking since he was 16th in November 2016.
"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. Before long, the greens were filled with tiny pellets, and workers went from using squeegees for excess water to power blowers to remove the hail.
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.
He just didn't want to stay another day.
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 has been a special week for me", Mickelson said. "In all honesty, it's a good thing to play the last two holes in fresh conditions".
Jason Day closed with a 68 and was tied for fourth at 13-under 175 with Si Woo Kim (68).