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.

Sepp Straka set the early target on the opening day of the Scottish Open as world number one Scottie Scheffler "hung in there nicely" to be ominously well-placed on a congested leaderboard.

"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.