American Patrick Reed claimed the WGC-Cadillac championship as Graeme McDowell and Rory McIlroy failed to make an impression on the final day.
Reed appeared to be cruising to the biggest win of his career after taking a four-shot lead into the final nine holes before starting to struggle, with a bogey on the 15th leaving him just one clear of Welshman Jamie Donaldson.
However, Donaldson made his first bogey of the day on the last to give Reed some breathing room and the 23-year-old American managed to steady himself to record a one-shot victory.
Reed became the youngest winner of a World Golf Championship event.
For Northern Irish duo McDowell and McIlroy it was a day to forget.
McDowell finished the tournament tied for ninth – six shots adrift of Reed after shooting a final round of 73 – one-over-par.
The Portrush star completed the tournament on two-over.
McDowell started his final round brightly with two birdies in the front nine.
But four bogeys and just one birdie after the turn halted any chances of claiming victory.
McIlroy finished tied for 25th after shooting a final round of two-over-par – completing the tournament on five over.
McIlroy enjoyed an encouraging start as he birdied the first.
A bogey at the ninth saw him reach the turn on even par, before bogeys at 15 and 18 completed a frustrating day.
World number one Tiger Woods failed to mount a challenge, closing with a 78 to finish tied for 25th. Woods had been in contention after a superb six-under-par 66 on Saturday left him three shots adrift overnight.