DORAL, Fla. -- American Patrick Reed became the youngest winner of a World Golf Championship event when he held on for a one shot victory at the Cadillac Championship on Sunday after an ailing Tiger Woods failed to mount a challenge.

Reed shot a final round of even-par 72 to finish the $9 million tournament at four-under 284, one shot clear of Bubba Watson and Jamie Donaldson. It was Reed's third PGA Tour title in eight months.

"I was hitting the ball so good this week and my putting was just outstanding," Reed said.

The 23-year-old began the final day with a two-stroke lead and quickly built up a commanding four-shot cushion before fighting off a late challenge from Donaldson.

The Briton birdied the 17th hole to close within one shot of Reed. But when Donaldson bogeyed the last after finding a greenside bunker with his approach shot, Reed was able to lay up and seal victory with a bogey.

Donaldson (68) and Watson (70) finished tied for second at three-under.

Hadley ups game to win Puerto Rico Open

PGA Tour rookie Chesson Hadley survived a late charge from Danny Lee to win the $3.5 million Puerto Rico Open by two strokes on Sunday.

Hadley said he was "sick and tired of playing like an idiot" when he arrived in the Caribbean, so he did something about it, leading throughout the final round on the Trump International course in Rio Grande.

The American shot a five-under-par 67 in his final round on Sunday, but it was far from a cakewalk to victory as New Zealander Lee birdied the 13th, 15th and 16th holes to close the margin to one stroke with two holes left. Hadley, however, responded in style with birdies at the final two holes to finish at 21-under 267 for his first tour victory at the age of 26.

The Puerto Rico Open was contested by players who did not qualify for the WGC-Cadillac Championship.