Golf | European Tour
The defending Dubai champion sank birdies in three of the opening four holes on a cloudless morning at the Greg Norman-designed Earth course.
After a 30-foot birdie on the opening par four, a 40-foot eagle attempt came up just short to leave him with a simple birdie at the second and the 24-year-old Northern Irishman picked up another shot on the fourth as girlfriend Caroline Wozniacki looked on.
But bogeys on the fifth and eighth holes stymied McIlroy's charge, and although he birdied the seventh he dropped another shot after finding the water on the 18th to end on 71, five behind early leader Alejandro Canizares.
"I feel like I played better than the score suggested," McIlroy told reporters. "I was pretty wasteful on the back nine. I had a good chance at 10, good chances at 14, 15, 16 so there were a few chances out there that I didn't take. I'm coming off the course disappointed, but I know there's a good score out there."