"Well, I knew it all through my caddie [Paul Tesori], who's been here so many years," Simpson said. "I just kind of had to listen to him."
Tesori has caddied for years on tour, for Vijay Singh and Jerry Kelly, in addition to being a pro himself.
"It's hard for us players to listen to our caddies, but he basically showed me where to go yesterday and told me where to hit it, where the lines were, what clubs to hit," said Simpson, the 2012 U.S. Open champion. "I didn't feel like it was my first time because he has so much experience here."
Seven-time Bridgestone winner Tiger Woods did not have to rely so much on the man on his bag, Joe LaCava, while shooting a 66. Woods has 11 top-10 finishes in his 13 starts at the course, so he clearly knows where to go.
Still, he needed his counsel from time to time.
"I hit a lot of good shots. I had a really good feel for the distance today, and Joey and I really read the wind right today," Woods said after his best opening round at the course since another 66 spurred him to a one-shot victory in 2005. "We changed a lot of shots out there, and we both had a really good handle on what we were doing feel-wise with the wind."
Henrik Stenson was alone in second with a 65. Defending champion Keegan Bradley, Ryan Moore and Chris Wood, another first-time entrant, matched Woods at 66.
Women's British Open • Wearing a black rain suit and a soft smile, Inbee Park looked calm as ever standing before the imposing Royal & Ancient clubhouse before she teed off.
Only after her unsteady round of 3-under 69 did Park reveal perhaps the biggest surprise at St. Andrews.
Park wound up three shots behind Morgan Pressel and Camilla Lennarth of Sweden, a solid start to what should be a fascinating week at the home of golf.
Her pursuit of history looked more like a high-speed chase when the 25-year-old South Korean made six birdies in 10 holes. Three poor tee shots, two three-putt bogeys and one double bogey from a pot bunker on the back nine made her realize there's a reason no golfer has ever won four majors in a single year.