The Scottish Open has become one of the big events on the golf schedule ever since it became a partner event between the PGA Tour and the DP World Tour, as the best players from both tours come together for a chance to play some links golf in preparation for the Open Championship a week later.

"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.

Of the 156 golfers who entered the tournament, 65 are guaranteed to make the cut and play this weekend.

Mike Tirico looks at the back nine of Royal Portrush, which features iconic holes such as Calamity Corner that will add to the drama of The Open Championship. The Genesis Scottish Open continues Saturday at The Renaissance Club in North Berwick, Scotland.