WGC-Cadillac Championship: Dustin Johnson triumphs Miami

Dustin Johnson lifts the WGC-Cadillac Championship trophy in Miami

American Dustin Johnson fired a three-under-par 69 to win the WGC-Cadillac Championship by one stroke on Sunday.

Overnight leader JB Holmes started the day with a five-shot lead but carded a 75 to finish runner-up at eight over.

Johnson, in only his fifth start since returning to the PGA Tour after a six-month break from the game, mixed four birdies with one bogey.

Rory McIlroy carded a par-72 for his final round as the world number one finished in ninth place on one under.

Bubba Watson, who led by two strokes after nine holes, finished third after hitting three bogeys on the back nine.

The two-time Masters champion birdied four of his first seven hole to take the lead from Holmes, who endured a disastrous start as he bogeyed three of his first six.

But Watson proved equally incapable of handling the pressure of being out in front as he bogeyed holes 11, 12 and 14.

Holmes took until the 16th to record his first birdie of the day and all Johnson had to do to win was play steady golf to overturn a five-shot overnight deficit and take the title.

"It means everything," Johnson said. "It's been a tough road but I played really good. It feels awesome to get that 'W'. I played great today."

McIlroy said he was disappointed with his form after finishing with a double-bogey at the 18th to card a 72.

"The game's just not quite there," the Northern Irishman said. "I'm tentative, a little bit scared to play certain shots, because I feel like I can't at the minute.

"I have just got to get back at it tomorrow and try to figure out what I need to do."