Johnson, who's guaranteed the season-long FedEx Cup and a $US11.53 million ($A15.10 million) payday if he wins on Sunday, carded two bogeys and a double bogey in his last six holes, but countered them with two birdies to stay on top.
Dustin Johnson is closing in on a wire-to-wire win at the Tour Championship, although Rory McIlroy is now just two shots back. I played such a great round today and kind of left everything out there.
"I knew DJ (Johnson) was a few shots ahead of me and if there's anyone I'm looking at this week, he's the guy", said the former world number one.
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Asked about trying to earn U.S. captain Davis Love's final wild card, the world number seven said: "The golf tournament is the only pressure because he's been saying, and also when he talked to me a couple of weeks ago, it wasn't about play, it was about who fits the team and pairs up nicely".
"I hit a seven iron from 122 yards into the 18th green", he added. Im swinging really well. Dustin Johnson, at 7 under after rounds of 66-67 is setting the pace, and Kevin Chappell (66-68) is right on his heels, most of the players are struggling to break par.
A third win of the season today would give McIlroy the first prize of $1.5m and the four-time major victor can also pocket the $10m bonus for winning the FedEx Cup if Johnson finishes joint second or worse.
The 30-year-old, who has never won on the PGA Tour, made two birdies in a bogey-free round and he will be hoping to make a solid start when action gets underway on Sunday. He put up the low round of the day - a 66 - shared by many (six others went 4 under) but put to better use by none.
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Black Caps bowlers blunted before lunch
It was a day that belonged to New Zealand , who played with a lot of self belief and did not stray from their plans. But Wagner got the next short ball much closer to the body, and Kohli couldn't resist having another go.
"I would have liked it, but it still wouldn't have felt as good as if I would have won the Tour Championship".
But Chappell, 15th in the standings, is unlikely to claim the FedExCup top prize even if he wins the tournament. The tournament was reduced to 54 holes because of fog delays over the first three days.
McIlroy took out the Tour Championship and FedEx Cup.
McIlroy is five shots adrift of Johnson on two under par.
Rory McIlroy made a Saturday run, carding four birdies for a 66. Just as it was wrapping up Saturday afternoon, hustling so it could clear network air space in favor of the spectacle that is Notre Dame-Duke football, this Tour Championship got real. "I hit 17 of 18 greens and didn't make many mistakes". He was cruising to a tournament victory that would assure him the FedEx Cup and its $10 million bonus while everyone else played for diamond-encrusted scraps. American captain Davis Love would find it hard to ignore Moore for the final wildcard place if he won at East Lake, but anything less could see Bubba Watson, Justin Thomas or Daniel Berger given the nod for Hazeltine.
The American has done himself no harm at all, and through 36 holes has only made one bogey- by far the best record in the field.
"It's all about personality and game types, who fits up good, so whatever that means I haven't got the call yet". It left Moore needing to hole from 8ft to win but his putt lipped out and the agony was written all over his face. In those four runner-up finishes, Jason Day beat him twice and McIlroy beat him once. He earned a total of $11.53 million on Sunday, including $1.53 million for the Tour Championship.
"It seems I like going against the hot player at the time", he said.