The 31-year-old, who had a dream start with six birdies in seven holes on Thursday, crashed to two triple bogeys and six other bogeys for a three-day total of 15-over 228.
After his first round at 68 and a second round of 77, the third round was most disappointing as he went into the bunker far too many times, suffered a lost ball and endured a bunch of bad lies in the sand pits.
On the plan for last day, he said, "I might be a little bit aggressive off the tees because I'm in a nothing-to-lose situation. I guess I need to get to know links golf a little better. Major championships are tough learning curves. That's why they are so tough to win and to play well."
Up ahead on leaderboard, English star and former World No.1, Lee Westwood, marched towards his maiden Major as Britain got ready to celebrate another sporting success this summer, close on the heels of Justin Rose's win at the US Open golf, Andy Murray at Wimbledon and the Ashes cricket series.