Former Open champion David Duval admits he played some "c****y shots" after posting 91 -including a 14 on one hole - for the first time in his career.
The 47-year-old, winner at Royal Lytham and St Annes, was two under after two holes before the wheels came off in spectacular fashion.
After a quadruple-bogey eight at the fifth - a driveable par four - things got even worse at the par-five seventh when he lost his first two drives and then mistakenly played the wrong ball after yet another tee shot into the rough.
That meant he had to play from the tee for a fourth time - his eighth shot - and completed the hole in a further six shots.
There was so much confusion Duval thought he had shot 90 and it took a further hour and a half after he had signed for his score for officials to amend his card without further penalty.
"I've just done something I've never done as a professional: I've posted 85 twice but I've never posted a 90. It was a long day, a rough day," said the American, at the time unaware of the discrepancy, who was struggling with tendonitis in his left elbow.
"I had a couple of bad tee shots and then we thought the marshal had my ball, asked if it was a Titleist 2, I looked at it and saw a two and played almost the entirity of the hole and it turns out with the wrong ball. A very unique, awful situation.
"It is not reflective of anything I have been doing, it is one of those God-awful nightmare scenarios which happened today and I happened to be on the end of it.
"I hit some c****y shots, I put myself in that position. "Obviously I'll be last place but maybe if I am feeling good I can try not to be in last place after the end of the week."