Tiger Woods declared himself happy with his day's work after shooting a 66 in the first round of the Open to move into a one-shot lead at St Andrews.
The world number one had seven birdies in nine holes to the 12th before some bunker problems checked his momentum.
"It's a great start to the tournament. I ended up in three bunkers but, all in all, I'm very pleased with six under.
"I've played well in this year's majors with a first and a second and I want to keep building on that," said Woods.
"A second win at St Andrews would be special but I've still got a lot of work to do."
Woods finished on six under par, one better than his opening round at St Andrews in 2000, when he shot 67 and went on to win the tournament by eight strokes with a 19-under total.
He is one stroke clear of Australian Mark Hensby and two ahead of a group including England's Luke Donald, South Africa's Retief Goosen and Spain's Jose Maria Olazabal.
US Open champion Michael Campbell of New Zealand and world number two Vijay Singh of Fiji are in a group one shot further back after rounds of 69.
England's Steve Webster and Spain's Sergio Garcia looked like finishing high up the leaderboard but fell away in the closing stages.
Goosen was playing his first round at a major since his final-round collapse in the US Open at Pinehurst, when he let slip a three-shot lead.
He reached the turn on two under and shot four more birdies on the way home, but a double-bogey at the 13th denied him a better score.
"I'm fairly pleased. I hit a few bad shots but I holed some putts too, which helps around this course," he said.
"Pinehurst is pretty much history. I wasn't thinking about it at all."
Olazabal equalled his best opening round in the Open with an encouraging 68.
Three weeks ago he was not even in the field but he made it as the highest world ranked player not exempt when Seve Ballesteros withdrew.
"I'm really happy. First, really happy to be here and even play in the event because I failed to qualify.
"And if you score well, it's obviously going to be more fun," said the 39-year-old.
Campbell drew inspiration from his US Open triumph to birdie four of the last five holes.
"My management company gave me a DVD of Pinehurst and I watched it before I went to sleep," said Campbell.
"It was the first time I'd seen it and I had goose bumps. It was nice to see how I played against the world's best."