On the 433-yard 12th, Johnson's nuke off the tee ran onto the green.
If you thought the fictional Happy Gilmore could smack a ball hundreds of miles, then you haven't seen real life pro-golfer Dustin Johnson let one rip from 400 yards.
"I've really been driving the ball (well) this week", added the American, who has a new driver in his bag.
Last season Johnson won four times, marking the best year of his career, and he said in Hawaii that he believed it was possible for somebody to win eight times or more in a year.
Dustin Johnson won Sunday at Kapalua, almost ending the fight on the 433-yard 12th hole at the Tournament of Champions on Sunday.
"If I keep playing good, keep working, keep learning about myself, I just need to keep getting better scores without my A game like I have this week", Rahm said.
He played the 12th hole in four shots on the weekend.
Johnson, who seized the world No. 1 ranking last February, has now won at least one USA tour title for 11 straight years.
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In typical nonchalant fashion, he remarked "I hit it a little thin", before grinning and confessing, "I hit it perfectly".
"It's no easy task to catch DJ", said Rahm, who lost to Johnson in the final of Match Play a year ago. "Whether I win or lose".
Johnson won for the 17th time on the PGA Tour, and the fifth time dating to the Genesis Open at Riviera last February.
Johnson claims he'd forgotten all about China until media reminded him of it.
"I got off to a great start, and I want to keep it going, " Johnson said.
The 25-year-old started off strong with birdies on Nos.
"Not very long, I don't think". He was consistent and impressive through all four rounds, shooting 69-68-66-65-268.