WATCH: Phil Mickelson misses "shortest ever putt on Tour" at US Open

Phil Mickelson got every single golf fan out of their seat on day one of the US Open at Pebble Beach after missing a tiny one-foot putt on the par-4 third hole at Pebble Beach.

Fox Sports commentator and former PGA Tour pro Paul Azinger described the gimme gaffe as quite possibly "the shortest missed putt of any player on Tour ever."

Watch Mickelson's shocking missed putt below...

Phil Mickelson misses “shortest putt of any player on this tour ever,” according to Paul Azinger, who may have a point ... pic.twitter.com/wCGCL1isLl

— Christopher Powers (@CPowers14) June 13, 2019

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Mickelson, who is looking to win the US Open to complete golf's career Grand Slam, went on to card a 1-over 72 to lie seven strokes off the early pace set by England's Justin Rose.

Lefty caused the biggest controversy of last year's US Open at Shinnecock Hills when putting a moving ball on the green, resulting in a two-stroke penalty.

WATCH: THE HAPPY GILMORE REMAKE OF PHIL MICKELSON'S MOVING BALL INCIDENT IS THE BEST THING YOU'LL SEE ALL WEEK!