After improving on his lacklustre opening-round performance, McIlroy said his primary goal was simply to ensure he was still playing on the weekend, although he felt he had left opportunities on the course.

"I think the main objective today was to be here for the weekend, which I am," McIlroy told media.

"I felt like I left a couple out there."

The Northern Irishman said birdies at the 8th and 9th gave him momentum, but admitted seeing a pair of 62s on the leaderboard made him feel he could have gone lower.

McIlroy believes getting to four- or five-under early in the third round will give him every chance, noting several players near the top of the leaderboard will be experiencing their first taste of leading a major championship over the weekend.

He plans to continue leaning on one of the strongest parts of his game, saying his driving has been a major advantage through the opening two rounds.

"I have driven the ball so well the last two days," he said.

"Anytime I can get a driver in my hand, I'm going to try to."

While pleased with his long game, McIlroy admitted he is still searching for comfort on Royal Birkdale's greens, despite making progress after discussions with putting coach Brad Faxon.

"We were more just talking through the process and being committed and trusting," McIlroy admitted.

"I feel like I did a better job of it today."

McIlroy also revealed driving the par-4 9th was never part of his original game plan, with a favourable wind creating an opportunity he felt he had to take. He expects pin positions over the weekend to provide another stern examination if tournament officials continue to tuck them close to the edges of the greens.