The notorious Green Mile struck again as world number three Jason Day’s hopes of a second USPGA Major win look all but over following a quadruple bogey at the last.
Finishing level on par for the day, Day trails leader Kevin Kisner by seven and joint second Chris Stroud and Japan’s Hideki Matsuyama by six heading into the final round later today.
The Aussie was left to reflect on throwing caution to the wind at the last, carding an eight on the 18th to fall out of contention, where a par would have left him just three behind.
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His first shot took him behind a tree, before he gambled on a second around the tree only to find more bushes.
He chipped out only to end by three-putting.
It was an implosion labelled "crazy" by golfing legend Nick Faldo.
"You are kidding me? (It's) one of the craziest decisions I've ever seen," Faldo told television viewers.
"I'd love to know what he really thought he could do with that second shot."
One of golf’s toughest stretches, the Green Mile, comprising the punishing 16th, 17th, and 18th holes of the Quail Hollow course, and named in tribute to the 1999 prison movie starring Tom Hanks, had earlier threatened to derail the hopes of leader Kevin Kisner
The American saw his lead cut back to one shot after finding the water and double bogeying on the 16th. He was more fortunate on the 18th when he again hit water before bouncing out and making the rough, but still bogeyed.
“I didn't make the putts I've been making the first two days and had just a terrible finish there," Kisner told BBC Sport.
England's Paul Casey was another to wobble on the final three – finishing bogey, bogey, and double bogey to drop back to level par. But, he remains the highest placed British player.
Matsuyama, who started level with Kisner, retains hopes of becoming Japan’s first Major winner as he continues a streak of form which had seen him rise to number two in the world after finishing runner-up in June’s US Open.
You can watch Day's nightmare hole below.
He followed this by winning the WGC-Bridgestone Invitational earlier this month, shooting a course record-tying 61 in the final round to win by five strokes.
In the last Major of the year, Justin Thomas and Luis Oosthuizen tie for fourth on five under.
Those considered realistic contenders are contained in a group stretching only as far as two under par. This group includes world number one Dustin Johnson.
Much of the pre-tournament spotlight had fallen on the young guns, pre-tournament favourite Rory McIlroy and winner of the British Open, Jason Spieth.
However, both look to be out of the running after finishing four and three over respectively.
Favourite and course record holder McIlroy hit a two over par 73 which included five bogeys. And Spieth’s hopes of breaking Tiger Woods' record as the youngest career Grand Slam champion lie in tatters as begins his final round 10 shots adrift of Kisner.
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