A gutted Jordan Spieth hopes he never again experiences a collapse like his one at the Masters on Sunday.
The American holed two bogeys and a quadruple bogey to start the back nine as he coughed up a five-shot lead in his title defence at Augusta.
Spieth finished with a one-over 73 to end up at two under, three shots behind eventual winner Danny Willett.
The distraught 22-year-old struggled to explain his finish in a post-round interview.
"Pretty sure I'll be disappointed with that one," the two-time major winner said.
"We still have confidence that we're a closing team and we can close.
"I have no doubt about that ability, it was just a really tough 30 minutes for me that hopefully I never experience again."
It was at the par-three 12th where it all unravelled for Spieth as he twice found the water to produce a seven.
Spieth said he simply made multiple errors before losing concentration.
"That ball flight is one that's come up quite a bit for me on par-threes this week. I'm not getting around my body enough, a bad swing on it right at the wrong time," he said.
"And then I probably should've gone to the drop zone where we knew the yardage, it was kind of tough for me to commit over by the 13th hole. It just compounded mistakes.
"Just a lack of discipline to hit it over the bunker coming off of two bogeys instead of recognising I'm still leading the Masters by two shots."