Robert MacIntyre carded a brilliant 62 to hold a three-shot lead after day one of the BMW Championship at Caves Valley Golf Club as Rory McIlroy and Shane Lowry both carded a level-par 70.
The Scot, MacIntyre, was among the later starters that got to take advantage of softer conditions after a two-hour rain delay, with darkness preventing Bud Cauley from completing his opening round.
MacIntyre, who is on the verge of joining McIlroy, Tommy Fleetwood and Justin Rose in qualifying for Europe's Ryder Cup team, finished with six successive birdies and carded 10 in total against two bogeys.
The highlight of the left-hander’s day came when he holed a 66-foot effort for birdie at the 13th to spark his spectacular finish.
"The last six holes is probably as good as I’ve ever putted in a stretch of holes – just so consistent," said MacIntyre.
"When you get the eye on, it’s free flowing, and it’s nice.
"I feel like the way I play golf is better suited for the tougher tests, where you’re rewarded for hitting a fairway, you’re rewarded for hitting a green, and then take your chances with the putter. Just happy with today’s work."
MacIntyre leads by three from England’s Fleetwood, whose wait for a first PGA Tour title goes on after he was pipped by Rose at the St Jude Classic last week.
Scottie Scheffler’s hot streak continued as he fired an opening 66 to lie third.
The world number one finished with three birdies in the final four holes to top the early leaderboard at the second FedEx Cup event.
Scheffler, who has registered 12 successive top-eight finishes in a scintillating year, said on Sky Sports: "It changed pretty significantly, a lot softer. The fairways were a little bit harder to hit this morning.
"They’re still pretty wide, but they were still with the firmness, challenging to hit. And then with the softness coming in with the rain, the golf course got significantly easier."
Scheffler was playing with Masters champion McIlroy, who battled to that even-par opener.
The Holywood star, who skipped last week’s FedEx Cup event knowing he is guaranteed to be in next week’s Tour Championship, had a slow start, with three bogeys in the opening six holes, but battled back.
Shane Lowry started his round with a trio of birdies before dropping a shot on the seventh. It was a mixed bag on the back nine with birdies on 11 and 16 along with four bogeys.
