Lee Westwood found himself leading The Masters Tournament again after Henrik Stenson went from six under par to one under on his 36th birthday at Augusta National.
While Westwood, making his 56th attempt to win a Major, had four birdies in a row from the fifth and turned in 32, former Ryder Cup team-mate Stenson - spectacularly good for 15 holes - followed a three-putt bogey on the short 16th with a quadruple-bogey eight at the last.
In trouble off the tee, he then topped his third shot, went over the green, left his chip on the fringe and three-putted once more.
The Swede was not the only one to hit trouble - Rory McIlroy's return to the course started with a double bogey and World Number One Luke Donald was also having a tough day.
Tiger Woods was one under with one hole remaining and Scot Paul Lawrie, playing the event for the first time since 2004, eagled the 13th and 15th for a three under 69 that set the early clubhouse target.
The 1999 Open Champion, now 43, had never broken 70 in 14 previous rounds and had not managed an eagle either in 264 previous holes at the venue for the season's first Major.
Westwood led with nine to play before slipping back to sixth in 1999, and two years ago it was only an inspired closing 67 from Phil Mickelson - one over after six like McIlroy on this occasion - that denied him.
McIlroy's hopes of making full amends for his closing 80 last April had hit an immediate obstruction.
The 22 year old Northern Irishman, who missed out to Charl Schwartzel after being four ahead 12 months ago, came back to win the US Open Championship by eight shots two months later.
But after driving into the right-hand trees, failing to make it back to the fairway off the pine straw, and then three-putting he was not off to a good start.
At least the second-ranked player in golf birdied the long next, while Donald was four over with two to play.
He birdied the second and eighth, the two par fives on the outward half, but there were also six bogeys in his first 13 holes.
For his two eagles, Lawrie first of all hit a rescue club to three feet on the 13th and then he chipped in from 45 feet at the 15th.
He refused to let a closing bogey spoil his mood - especially as he was not even certain to be playing after going down with bronchitis three weeks ago - and it was three better than Stenson managed on the hole.
"I'm still a little bit weak and not quite 100 per cent," Lawrie said.
"I've played only nine holes every day (in practice) and worked a lot on my short game.
"I'm trying to keep it low key. I'm not thinking about winning at all - I'm three behind already!"
Four-time champion Woods, the pre-tournament favourite after winning at Bay Hill a fortnight ago, saved par from the left-hand trees on the first two holes - he had to take a penalty drop on the long second - and holed from nine feet for birdie at the third.
A birdie at the tenth took him to two under, but he missed out on birdies at the two inward par fives.
Through the green in two on the 13th, he failed to get up and down from the sand, while at 15 another drive left forced him to lay up short of the water. He then had another bogey on the 17th.
Woods paid for yet another bad drive down the last. He had to take a penalty drive just as he had on the second and did well to salvage a second successive bogey.
It meant a level par 72, the same as defending champion Schwartzel and England's Justin Rose.
They were only three behind when Westwood failed to get up and down from off the tenth green and bogeyed to fall into a five-way tie with Lawrie, Jiménez - second man to break 70 - Francesco Molinari and Bubba Watson.
McIlroy, meanwhile, was alongside Woods when he made a seven foot birdie putt on the long eighth.
McIlroy was right back into things when he also birdied the ninth to turn in a one under 35 - no mean feat after that opening six - and that brought him to the hole he triple-bogeyed a year ago.
Rather than going left this time he went way right, but from there he was able to slice his ball close to the green and a chip to three feet enabled him to save par.
Mickelson, who bogeyed the ninth for one over, was the one to go left off the next tee and it was not found in the permitted five minutes.
Mickelson's error led to the same triple bogey McIlroy took on the hole and at four over he was seven behind and joint 75th.
Former Open Champion Louis Oosthuizen became the new leader when he birdied four of the last five for a 68, but Westwood joined him on four under when he picked up another birdie at the 13th.
