Top 5 major championship collapses
Dustin Johnson set the stage for the first major championship victory of his career on the par-5 18th at Chambers Bay on Sunday.
He stuck the green from 250 yards out with a 5-iron - an amazing feat - setting up a 12-foot eagle putt to win the tournament.
Destined for greatness, while his father-in-law Wayne "The Great One" Gretzky watched, all the 31-year-old had to do was trust his putting - something many golfers struggled with on the greens all week.
The seemingly worst case scenario was that he missed and two putted for birdie, forcing an 18-hole playoff Monday.
But even that scenario was a bit optimistic.
Johnson had a complete meltdown, fumbling both the 12-foot eagle and subsequent 4-foot gimme. He lost, awarding Jordan Spieth his second major victory of the season.
DJ's collapse isn't all unlikely, and in an effort to mitigate his woes, we'll take a look at some similar instances that have occurred at major championships.
Phil Mickelson's 2006 U.S. Open meltdown
Phil Mickelson held a one shot lead going into the final hole at the 2006 U.S. Open. With a par, he could win the tournament.
His tee shot was errant, landing among a crowd of fans and off the fairway. But his second shot had a glimmer of hope. If he were to cut around one blocking tree, he would be in good position to save par.
Lefty hit the tree on his second attempt, while his third shot caught the trap. Nothing was working for the five-time major champion, and he finished with a double-bogey. All he needed to force a playoff with Geoff Ogilvy was a bogey.
Arnold Palmer's 1966 U.S. Open undoing
Arnold Palmer led the charge in the final round of the 1966 U.S. Open at Olympic Club by seven strokes. Even going into the back half of the round, he still maintained the 7-shot lead, but it would be undone by Billy Casper.
Rather than playing it safe in the back nine, Palmer went for the Open record of 276, previously recorded by Ben Hogan. In targeting the record, he inadvertently hindered his play.
Casper remained focused, embracing the role of the underdog.
Palmer's lead vanished by the 18th, and his final putt needed to be made just to enter a playoff with the tailing American. He sank it, but everyone could sense the frustration.
The following day, Casper won going 1-under par in the 18-hole playoff. Palmer finished 3-over.
Adam Scott's bogey-filled British Open
Adam Scott's inexplicable fall at the 2012 British Open could possibly be the worst collapse in golf history.
The then 34-year-old was leading by four strokes going into the final four holes in the final round.
He bogeyed 15 and 16, setting up a catastrophic failure. The Australian then attacked the sand on 17 and 18, making things that much more difficult.
His worst nightmare became a reality - dropping four strokes in four holes - as he handed the championship to Ernie Els.
Greg Norman's 1996 Masters letdown
While many of the aforementioned events occurred in more sudden fashion, Greg Norman's tumble at the 1996 Master's was gradual.
The Shark was up six strokes heading into Sunday of the 60th Masters at Augusta. He looked unbeatable in the previous three rounds, but watched his lead slowly, but surely, slip away in Round 4.
The Australian shot 6-over 78, missing putts, while finding traps and hazards. Nick Faldo won by five strokes.
Van de Velde's humiliating loss
Jean van de Velde's final hole triple-bogey at the British Open in 1999 might be the most humiliating meltdown of the century.
The Frenchman had a three-stroke lead on the final hole of the tournament, but some suspect decisions - including teeing off with his driver - resulted in him completely missing the fairway. He proceeded to hit the bleachers with his second shot.
His third found the drink, and in what many thought was a joke, he nearly tried to play it out of the water, but thankfully didn't. He proceeded to find the sand, eventually finishing with a triple-bogey.
The pressure was clearly too much, as the bumbling golfer then lost in a playoff to Paul Lawrie.