Rahm, in his first year on tour and already a victor at the Farmers Insurance Open earlier this season in San Diego, knocked drives past his famously long opponent and eventually pulling back to within one hole after birdieing the 13th, 15th and 16th holes, the latter on a 32-foot putt that sought out the hole like a laser. This victory does not get him into the Masters because the Puerto Rico Open is held the same week as a WGC.
"Somehow", he said with the exuberance of a little child, "the ball went under the first tree, (and) rose just over the next one in a gap about this big (holding his hands up in a 2-foot circle)".
The World No.1 remained dominant all week over his opposition, and his win confirms him as the first player in history to win all four WGC titles. His chip down the slope was short of the ridge, and he had to settle for par.
No wonder that when Hideto Tanihara was asked for his strategy in his semifinal match against Johnson, he said through his translator, "He looks unbeatable". It amazes me. And he's just a ideal, complete player.
None of his first five matches went longer than 16 holes until Sunday, when Johnson faced the first threat of the week.
With Tanihara in trouble on the 15th, Johnson came up well short of the green with a wedge and missed a 5-foot par putt to win the hole. Then, he had to make an 8-foot par putt to beat Tanihara and avoid extra holes. "He is a great player and with all that potential is going to be a great player for a long time". "I gave him 10 when I three-putted but that was about the only hole I gave him, he played tough".
Johnson was 5-up through eight holes but withstood a furious rally by the Spaniard, who was trying to become the youngest victor of one of the elite WGC events.
It was the dream match between these two outstanding players that golf fans wanted most in the finals.
"After a great deal of thought and consultation with my team, I have chose to withdraw from this week's Shell Houston Open, " Johnson said in a statement.
It was the second time this year that Rahm and DJ have been in the running for the top spot in a WGC tournament, and it turned out to be a thrilling contest between two of the biggest hitters in the game. After playing 112 holes in five days on his way to recording his third title in succession, it was probably a wise move on the 32-year-old's behalf as he concentrates on winning his first green jacket.
Lee, 26, tied the tournament record set in 2015 by Cristie Kerr, who tracked down Lee with a 65 to win by two strokes.
That was the sum measure of the distance by which Rahm, seeded 21st in the event, missed putts over the first eight holes.
At 13, Rahm drove the green and two-putted for a birdie that left him just 3 down again.
So Yeon Ryu of South Korea and Austin Ernst of Greenville, S.C., tied for second at 14-under. It's one of my favourite tournaments to play every year.
American journeyman D.A. Points reaped the benefits of a recent switch to a cross-handed putting style, rolling in nine birdies on his way to a two-stroke victory at the Puerto Rico Open on Sunday. The Spaniard picked up another hole on the par-4 10th, on which Johnson three-putted for another bogey.