McIlroy shot an opening 4-under 66 that featured six birdies and long drives. "I certainly can tidy a few things up," he said, "but overall a decent day.”

The Masters champion opened with a 66 at the Philadelphia Cricket Club as Keith Mitchell set the pace with a course record 61.

On a rainy, chilly day in which tee times were bumped up and preferred lies were in place, McIlroy shot 3-under 67. Added to his opening 66, he's at 7 under and five off Keith Mitchell's lead.

Tough conditions showed Rory McIlroy what Philadelphia Cricket Club was meant to be and what it could be again with a rolled-back ball.