Bubba Watson charged into a tie for the early first-round lead at The Barclays on Thursday while newly crowned world number one Jordan Spieth struggled to his worst score of the year in relation to par.
Twice Masters champion Watson used a red-hot outward nine as a springboard en route to a sizzling five-under-par 65 at Plainfield Country Club, setting the tournament pace with fellow American Spencer Levin and Colombia`s Camilo Villegas.
New Zealand`s Danny Lee and American Jason Dufner opened with 66s in the first of the PGA Tour`s four lucrative FedExCup playoff events.
Spieth, however, was let down by his usually stellar short game as he limped to a 74 in his first competitive round since he replaced Rory McIlroy at the top of the rankings by finishing second at last month`s PGA Championship.
"After the tee shots, that is the worst round I`ve played in years," Masters and U.S. Open champion Spieth, who hit 11 of 14 fairways on a challenging Plainfield layout, told reporters.
"It was really a very unique round for this year. I hit my first 11 fairways today and that`s really hard to do out here.
"Typically when I hit the fairways, I`m not over par. That`s what was weird about the round."
Spieth covered his front nine in a promising two-under 34 but then ran up five bogeys, a double at the par-three third after his tee shot found water and a lone birdie after the turn.
The best putter in the game recorded two three-putt bogeys as he carded his worst score since a first-round 75 at the Players Championship in May.
Asked how he would respond, the 22-year-old Texan replied: "I do what I have done best, bounce back. I come back tomorrow strong.
"I know I can still shoot a low round if I hit the shots I need to hit ... hopefully see a few more putts go in."
Left-hander Watson, who played with Spieth and PGA Championship winner Jason Day of Australia in a high-profile grouping, surged to the top of the leaderboard with five birdies in his first nine holes.
He picked up two more shots before a poor swing at the par-three sixth and a three-putt at the tricky ninth cost him two bogeys in his last four holes.
"All in all, it`s a good round but the back nine ... if I just make a better swing on the par-three and then a two-putt, it`s not too bad," said Watson.
"I missed the cut the last time I played here so we are ahead of the curve right now," he grinned.