Cameron Young's blemish-free 64 led the way after the first round of the 150th Open Championship, with Rory McIlroy firmly in contention at St Andrews.
Tournament debutant Young, who finished in a tie for third at this year's US PGA Championship, made the turn in 31 and picked up three more strokes on the way in to close on eight under.
McIlroy, who was defending champion but missed out through injury the last time the home of golf hosted this event in 2015, birdied the 18th to sign for a 66.
Tiger Woods faces a struggle to make the cut after the 15-time major winner carded an error-strewn 78 that included a double-bogey six at the first.
Claret Jug holder Collin Morikawa is eight shots off the pace after an even-par 72, while world number one Scottie Scheffler looms large at four under.
A host of putative contenders failed to keep pace with the leading pack, with Jon Rahm one over alongside Brooks Koepka, while Justin Thomas was one stroke better off.
It was Paul Lawrie who had the honour of getting this landmark edition of golf's oldest major under way, and the Scot finished his round with an eagle to post a 74.
There was huge disappointment for 2013 U.S. Open champion Justin Rose, who was forced to withdraw after suffering a back injury.
SHOT OF THE DAY
There will be no shortage of lengthy eagle putts on offer this week, with several of the greens on the many par fours reachable off the tee.
Ian Poulter had one such opportunity on the ninth, his drive leaving him with a putt of around 160 feet which he duly sunk.
That miraculous shot will have helped to soothe the Englishman's pain at being booed on the first tee, a reaction to his decision to join LIV Golf – though he claimed not to hear any jeers.
PLAYER OF THE DAY
English amateur Barclay Brown put himself in some esteemed company at the top end of the leaderboard following a stellar 68.
The 21-year-old, who qualified with a three-stroke win at Hollinwell late last month, handled the occasion brilliantly as he sunk five birdies and just one bogey.
Brown finished four strokes better off than the next best amateurs, with Sam Bairstow and Keita Nakajima both even par.
Paul Lawrie: "I was surprised how many people were there to be honest. I wasn't expecting that. I thought there would be a few, but the stand on the right was pretty full. Nice to see all the people. You always get great support here."
Barclay Brown: "I was unbelievably nervous at the start. And then once I got through the first couple of holes, yeah, it was nice to kind of calm down a little bit and hit some good shots and just get into it."
Scottie Scheffler: "There's a few holes where I don't know if it's possible to even hit the fairway, like if you're going to take the bunkers out of play, you can't hit the fairway."
A LITTLE BIRDIE TOLD ME
- Since 1939, every winner at St Andrews has been within three shots of the lead after the first round.
- Tiger Woods' round took more than six hours, with the three-time Open winner teeing off in a group at 14:59 BST (local time) and taking his final shot of the day at 21:07.
- England's Matt Ford made his Open Championship debut at the age of 44 and signed for a 71.