Simon Khan's hopes of a top 10 finish at The Open faltered with a disappointing final day 76 at Royal Lytham & St Annes.
The Chingford golfer looked well set at one under after seven holes.
But, after falling away to six over, he told BBC Radio Essex: "The three holes round the turn killed me with four dropped shots and I never recovered."
Fellow Essex man Dale Whitnell suffered comfortably his worst round of the week, closing with a six-over 76.
Whitnell, from Tiptree, managed just one final day birdie, at the ninth, in a card littered with five bogeys and a double at the 17th, which left him eight over for the tournament, tied for 60th.
"I didn't play my best golf," he told BBC Radio Essex. "I did all right on the front nine but, with the wind getting up and the greens getting firmer, it made it tough coming home.
"But it's all been an unbelievable experience. I've made the cut in an Open at the first time of asking. This is what I want to do and I've confirmed to myself that I can do it.
"I want more experiences like this, but with better results."
Whitnell, 23, now goes off to play in a Challenge Tour event at Stoke by Nayland next week as he assesses what his next big career move will be in the autumn.
"I've got some options," he said. "European Tour School, Asian Tour School or maybe even the States."
As for Khan, the 40-year-old from Chingford began well, with a birdie three at the second, responding well to a bogey at six with another birdie at the seventh to go one under.
But then came a run of four dropped shots in three holes - two of them going at the 10th. And, after another bogey at the 14th, he ran up another double at the 15th to come home in 41 - tied for 45th.
"I just made some silly mistakes," added Khan. "I was so in control after seven holes and it was bit of a shock what happened next.
"I could have been baled out by my putter but I had three five footers in a row for par and missed them all.
"I've got a bit of a break now before the Johnnie Walker at Gleneagles in August but I've now just to concentrate on finishing top 30 in the European Order of Merit and getting qualification to the Open at Muirfield next year.
"That's the minimum requirement as I know I'm a better player than I'm looking at the moment."