Rory McIlroy's dream of a third DP World Championship dissipated in Dubai as back-to-back bogeys down the stretch saw him beaten by Collin Morikawa.

Open champion Morikawa became the first American to win the Race to Dubai with his impressive -17 victory, topped by a final-round 66 as he saved his best form for the back nine on Sunday.

FULL LEADERBOARD

A short missed birdie putt at the par-five 14th was an opportunity lost for McIlroy and it seemed his luck was out entirely when his approach at the 15th hit the flagstick and bounced back into the bunker at the front of the green.

His third shot caught the fringe and he missed a difficult putt for par, handing Morikawa a one-shot lead.

The American doubled that lead with a superb birdie at the par-three 17th, making it four birdies in six holes down the stretch.

McIlroy needed a response, but his second at 16 was not close enough and his birdie effort from 30 feet went five beyond and he missed the par putt, ending his challenge.

He was agonisingly close to a birdie at 17 with a putt from the fringe, but his race was run by the time he found the trees with his final tee shot.

Colin Morikawa embraces his caddy after clinching victory

With little to lose, McIlroy decided to take on a risky hook shot over the back gardens of the course-side houses. He found a greenside water hazard, took his drop and three-putted for bogey to secure a sixth-place finish on -12, alongside Ian Poulter and Dean Burmester.

One shot ahead of playing partner Sam Horsfield at the start of the day, McIlroy was steady rather than sensational around the Earth Course at Jumeirah Golf Estate.

While Horsfield dropped four shots in his first 12 holes, McIlroy hit birdies at the second and 10th, with a bogey on the par-three fourth.

With seven birdies to the 15th, Matt Fitzpatrick looked like the Down man's closest challenger, but bogeys at 16 and 17 halted his progress, before a birdie at the last left him as the clubhouse leader on -14 after a six-under 66.

Shane Lowry started and finished with birdies, but a double-bogey at nine put paid to his challenge. However he still achieved a top 10 finish, with his final-round 71 good enough for a tie for ninth on -11.