Spieth, who entered the day with a three-shot lead over Johnson, shot 69.
Missing from the mix are Jhonattan Vegas and Rickie Fowler, who started the third round as part of the four-way tie for the lead that included Spieth and Johnson.
Johnson joined Spieth (69) at 13-under the card and the pair will head to a sudden-death play-off at the par-4 18th at Glen Oaks Club on Long Island.
Spieth's tee shot on the next hole banged off the rock wall and into the water on the par-3 sixth, and he made double bogey.
It was his first victory since he injured his back falling down stairs on the eve of the Masters in April.
By the time the duo walked to the 11th tee the day's final pairing was tied at 11 under, the byproduct of back-to-back two-stroke swings at the ninth and 10th holes and some clutch golf from Johnson. "Jordan is a tough competitor".
There is really no one else in contention for the PGA Tour Player of the Year Award, where the victor receives the Jack Nicklaus Trophy.
Johnson rallied from a five-shot deficit on the front nine. "Every time I had a wedge shot this week, I felt like I hit a really good shot and gave myself really good looks at birdie". "It was nice in the play-off here, the wind sort of switched so I could cover the water". "Coming up 18 I kind of just took a peek around and I didn't see any green grass outside of the ropes", Henderson said. "I feel like I'm swinging well again". No disrespect to Hideki Matsuyama, the Japanese machine who was ranked second in the world, but this is as good as golf gets at the moment. "This was the first one I've really had to work at". "I moved closer to the ball and the ball-striking was wonderful today".
After the win, once he'd enjoyed a few minutes to consider how he accomplished it, Johnson was still tickled that his final putt of regulation found the bottom of the cup.
With Spieth sitting within tap-in range for a certain par, Johnson had to hole the putt, and he read the break and the speed to near perfection to dish out a blow to Spieth.
Finally, in the year of its 10th anniversary, the FedEx Cup produced the drama that the PGA Tour, the sponsor and the fans have been craving thanks to a titanic battle between two of the world's best at the first of this year's Playoffs events.
"I didn't lose the tournament".
"But his body language was hanging in", Spieth said.
"[We] committed to targets that were away from holes, knowing I'm in the lead and knowing the putter is getting hotter each putt I hit".
"But I feel great about my game". He clipped branches, hit a poor chip and had to two-putt from 80 feet for his bogey. I had one bad putting day and one very average day. "Pretty much just continuing the momentum from the last couple days". But it's very hard holding a lead on a hard golf course when the guy you're playing with goes bogey-free and doesn't even really sniff a bogey and shoots 4-under. "Hats off to DJ. But no surprise, either".
The American duo now hold a one-shot lead over Jason Dufner (through 12 holes), Spanish world No.8 Jon Rahm and Matt Kuchar (both seven holes) who all share third at six-under.
Defending FedExCup championRory McIlroy is seven strokes behind after a 68.
Thomas fired four straight rounds in the 60s, but he just could not get it going enough to contend.
While that Masters loss left some justifiable scarring for Spieth, this one - despite the coughed-up lead - shouldn't even register on the scale of dejection. "And it was fun to be in the hunt again, and see my game hold up".
Tensions escalated in August between Washington and Pyongyang over North Korea's rapidly advancing nuclear and missiles programs. North Korea launched three short range missiles Saturday from a multiple-tube rocket launcher, according to the New York Times .
On Saturday night, however, he will be without his top two targets as Evans and Jackson will sit out as a precautionary measure. When you have a player in Jameis Winston that is a dark horse MVP candidate , these expectations come with the territory.
Democrats are uniformly opposed to Trump's wall and say any blame for a shutdown would rest exclusively with Republicans . President Trump has redirected his "fire and fury" at North Korea towards Congress , and in particular Mitch McConnell .
His two-run homer in the first last night accounted for the Phils' only runs of the evening as they were demolished by the Cubs . Leiter is the son of former Phillies pitcher Mark Leiter and the nephew of two-time All-Star left-hander Al Leiter.
Are we still hung up over that stunner against Borussia Dortmund during the Europa League quarter final past year ? The Reds have been sensational in attack, with their dismantling of Hoffenheim in the Champions League a highlight.
When Littlefinger appeared peering out from behind a corner at her with a smirk on his face it all seemed too convenient. Ah, but shouldn't Game of Thrones be allowed to develop its characters without having to respond to audience criticism?
Marine helicopter that will help get them to remote areas hit by a devastating natural disaster in Turkey. They said this storm is just beginning and they will do their best to provide refuge for anyone in need.
Vettel could hold the gap but did not look like he could close enough to threaten Hamilton, their lap times nearly identical. So I didn't want to be too far either. "To see so much support for Max is quite phenomenal", Horner said.
Sadio Mane has had a hand in five goals in his five previous Premier League starts against Arsenal (three goals and two assists). It means he averages a goal every 109 minutes, with Mane's goals coming every 199 minutes over the same period.
That hasn't impressed party activists here like Billie Bollwinkel. "I think he could govern in a way that he wouldn't". It all comes a week after a Trump tweet called Flake "toxic" and praised his Republican challenger, Kelli Ward.
Steelers to face rookie QB DeShone Kizer in Week 1
Rookie Zane Gonzalez kicked a 39-yard field goal in the third quarter to finish a 68-yard drive with Kizer at quarterback. I think we have been more in the gun than probably anything lately, but we have a variety of different things we do.
Milan - Cagliari: il Diavolo a punteggio pieno
Palla persa da Kessié vicino alla sua porta, ne approfitta Joao Pedro che spiazza Donnarumma e pareggia il match. Prima Joao Pedro sfiora la traversa con il destro, poi lampo di Barella da sinistra e il 99 del Milan controlla.
PCI Condemns Violence Against Media In Panchkula
Haryana Deputy Attorney General has been sacked following videos emerged showing him carrying the luggage of Gurmeet Ram Rahim . The court said the Khattar government had "surrendered" before the followers of the dera head for "political considerations".
Trump Bashes GOP Sen. For Questioning His Competence
The warning about a possible USA downgrade seemed less dire and narrower in scope than one issued on Wednesday by Fitch Ratings. Trump characterizes his Twitter behavior as a way to "get the honest and unfiltered message out".
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Additional volunteers are on standby, if needed, along with three vehicles stocked with disaster relief supplies, he said. The Type 3 task force is half the size of a Type 1 force of 80 personnel that could be requested by FEMA, Webber said.