The second round of the Genesis Scottish Open is set to begin on Friday, after four players all share the lead after carding opening rounds of 64.

"I definitely finished the round better than I started it," said McIlroy, who closed the first round with three consecutive birdies and is 2-under going to Friday.

McIlroy figured he was about 80% of where he wanted to be ahead of his return home to Northern Ireland next week.