"I know exactly where I want it to come down out of the air and it did", Johnson said.
"I mean I go back over it and talk about it, but as far as how long has it frustrated me or anything, not long".
Spain's Jon Rahm was second after a 69 for 276 and is set to rise from No. 4 to No. 3 in the world.
10 seconds later, the 33-year-old looked on as the ball landed three inches from dropping in for an albatross.
"It's no easy task, " said Rahm, who lost to Johnson in the final of Match Play a year ago.
Johnson lost a six-shot lead in the final round of the HSBC Champions in Shanghai last fall, his most recent PGA Tour start.
Johnson, who seized the world No. 1 ranking last February, has now won at least one USA tour title for 11 straight years.
"A lot of seasons I've only had one win, but last year was my most and hopefully I can do even better than that this year".More news: Chiefs coordinator Nagy to be named Bears head coach
Johnson claims he'd forgotten all about China until media reminded him of it. Johnson doesn't let much cross his mind.
Remarkably, on his way to the ball, Dustin said he hit the ball "a little thin" so it came up a little short.
"I want a lot more wins".
And then he produced another memorable round. Brian Harman, who entered the day as the nearest challenger at two shots back, ended at 15-under.
During Saturday's trek around Kapalua, Dustin Johnson's drive on the par-4 sixth just missed hitting the flagstick, finishing 70 feet or so from the cup.
Dustin Johnson won Sunday at Kapalua, almost ending the fight on the 433-yard 12th hole at the Tournament of Champions on Sunday.
In Maui this week he had extended his lead to four shots after just three holes on Sunday.
That stretched his lead to seven shots, and the rout was on.