Poulter, joint leader overnight on nine under alongside Ross Fisher, moved three shots clear of the field after two early birdies but his first bogey of the week on the fifth, after a three-putt, and another dropped shot on 10 left him level at that stage with Fisher, Kaymer and Jaidee.
Harrington, the winner in 2007 and 2008, hit a double bogey at the first and never managed to recover on a day where his putting was badly off-colour.
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DiMarco, making his first appearance in a European Tour event outside the majors and world golf championships, hit back from a double-bogey six at the first to keep within one shot of Stenson.
The only moment of doubt came when Edwards made his first bogey in 47 holes at the par-five fifth hole.
Jimenez described his round of 64 as a "solid day", while Howell was disappointed to pick up his first bogey of the week.
Karlsson was four shots clear after seven holes after recovering from a bogey at the first with three birdies in his next four holes.
Scott didn't make a bogey after the first hole, and he really didn't miss a shot the rest of the day on a rainy Sunday at Augusta.
Hanson bogeyed two of the first three holes, and Mickelson suffered an excruciating triple bogey on the par-three fourth hole when his tee shot pinged off the spectator railing into a bamboo thicket.
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The 36-year-old, who is on the board of directors for his home tournament, surged into the lead with a six-under 65 on Sunday but Matteson -- who had led from the first round -- made up for a double bogey at 15 as he eagled 17 and forced the playoff with his 69.
Westwood began his round at the 10th in cold blustery conditions on the east coast in Scotland and made an eventful start with three birdies in his first five holes, with a bogey at the short 13th sandwiched between.
The 51-year-old's start did little to suggest an impressive display was on the cards as he teed off into the bunker on the par-four first before putting for a bogey.
His opening 68 was the only bogey-free effort in the first round at Carnoustie and his performance caught the imagination of both spectators and the media alike at the famous Scottish links.
But in fact the ball was in play after the first drop - so he incurred a two-shot penalty, leading to the horrendous sextuple-bogey.
"I don't think you can report what I said to myself coming off the first green, " said Owen, who threw away the Bay Hill Invitational with a double-bogey, bogey finish last week.
It is the first time Woods has played the tournament, and his four birdies were tempered by three bogeys and a double bogey.
He bogeyed four of his first six holes before a double bogey at the sixth and another bogey at last left him on 75.
Angela Stanford also had a share of third until the final hole, when she lipped out a short par putt for her first bogey in a closing 69.
Chasing his first European Tour victory since the 2001 English Open, O'Malley shot a bogey-free round of six birdies.
Els, who won the US Open in 1994 and 1997 and the Open in 2002, picked up three shots in his first six holes but saw his challenge falter around the turn with a spell of bogey, double-bogey, bogey from the ninth.
The Dane had been three clear after grabbing birdies at five of his first six holes, but four-putted the eighth from 40 feet for a double bogey five.
Joint-leader Storm had eight birdies and just one bogey and got off to a flying start, making a birdie at four of the first five holes.
Ross Fisher was another to begin from the 10th at Carnoustie and recorded a double bogey at his opening hole, taking 41 to cover his first nine holes.
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