Published: Dec 01, 2011 11:15 AM EST
Updated: Dec 02, 2011 7:30 AM EST

HONG KONG (AP) - U.S. Open champion Rory McIlroy shot a 6-under 64 in blustery conditions on Thursday to share the lead with Alvaro Quiros and David Horsey after the opening round of the Hong Kong Open.

The Northern Irishman had the worst of the early morning conditions as most of the marquee names in the field, including defending champion Ian Poulter (71), struggled in the swirling winds at the Fanling course at Hong Kong Golf Club.

Quiros and Horsey shot their 64s when conditions improved later in the day.

"I was able to handle the wind pretty well today. This is probably the best round that I have played here," McIlroy said. "It was a solid round. I didn't make a mistake, six birdies and no bogeys is always a nice way to start the tournament.

"I hit 17 greens and just kept giving myself a lot of opportunities and it was very nice to be able to take a few of them."

The 22-year-old McIlroy, a two-time runner-up in the past three years in Hong Kong, acknowledged he has lost a couple of events from winning positions this year.

"That's something I've been trying to work on," said McIlroy, who blew a four-shot lead going into the final day at the Masters to finish 10 strokes behind winner Charl Schwartzel.

"But you know, as long as I get myself in these positions and start winning more regularly, I think then it becomes a habit and hopefully I will do it more often."

Quiros chipped in at the 18th for one of four birdies in a bogey-free round that contained an eagle.

"I was a little bit lucky to be up here," the Spaniard said. "It is still early days but I expect Rory to be up there all the time."

Horsey also made a birdie at the last, hitting a 9-iron approach to 2 feet for a simple tap-in in his bogey-free round.

"I played very nicely today and it was a pleasing start," the Englishman said. "I missed just two greens all day and had a couple of sand saves, which was nice as it kept the momentum going. But it is still early days."

Two-time champion Miguel Angel Jimenez of Spain is fourth after a 65. Ryder Cup players Edoardo Molinari and Padraig Harrington had 70s for a share of 29th place.

"Today I played very well and I'm pleased with a 5-under par score," said Jimenez, winner in 2004 and 2007.

McIlroy's playing partner, Poulter, holed only one birdie because of struggles with his putter.

"It was a tricky day, obviously disappointed. I played nicely but didn't hole a putt out there. I got work to do," said Poulter, who last year finished at 22-under 258 to set the tournament's lowest 72-hole score.