Australian Jason Day and American Zach Johnson share the lead after the first round of the Deutsche Bank Championship in Boston.
The pair both fired an eight-under-par score of 63 on a day where most of the field registered low scores in conditions made more difficult thanks to Hurricane Earl.
Tiger Woods was among those to struggle, hitting four bogeys in his first six holes before closing with a one-over 72 that left him nine shots off the pace.
"I just didn't have it today," he said. "I wasn't really doing what I was supposed to be doing out there swing-wise, and then wasn't releasing the blade out there and was dragging it a little bit. It was a bad day all round."
Johnson, however, was in vintage form and would have impressed US Ryder Cup captain Corey Pavin, who is set to name his squad on Tuesday.
Johnson was consistent with four birdies on both the front and back nine to take a share of the lead.
Day was slightly more erratic with 10 birdies making up for two early bogeys.
The Queenslander is in a rich vein of form and has not missed a cut since his breakthrough win in May at the Byron Nelson Championship.
"We kind of fed off each other," said Day.
"I felt really comfortable with my swing. I worked on my putting the first couple of days I got here, and that worked out great."
On Friday, the greens were smooth and soft in the morning and officials brought forward several tees and also allowed preferred lies from the fairways.
This was a precaution with large amounts of rain expected to hit the course during the afternoon and Day admitted the conditions worked in his favour.
"I knew I had to shoot a good score because we weren't going to get any better conditions. The next couple of days are going to be pretty tough, so it's good to get in the clubhouse at eight-under," he said.
Former US Open winner Geoff Ogilvy joined Johnson and Day at the top of the leaderboard after 14 holes before bogeys on 16 and 17 saw him slip back to six-under.
Ogilvy managed to regain his composure with a birdie on the last to be one of eight players on seven-under.
Fellow Australian Matt Jones is a shot further back alongside defending champion Steve Stricker, Steve Marino, Swede Fredrik Jacobson and Englishman Luke Donald.
Matt Kuchar, who won The Barclays last week, and the man he beat in a playoff, Martin Laird, hit 66 to finish five-under.