McIlroy, 30, grew up in nearby Holywood, and he set the Royal Portrush course record with a 61 when he was 16.
The 2014 Open Champion snap-hooked his first tee shot of the day out of bounds left, then needed six more shots-including taking a penalty drop for an unplayable lie and missing a four-footer for 7-en route to a quadruple-bogey 8.
But his fortunes this time around were not so forgiving as McIlroy went wide and out of bounds in an internal area of the course off the tee. He chipped onto the green but missed a 6-foot putt.
ROK central bank cuts rate, citing Japanese export curbs
South Korea's policy rate was already lower than that of the USA , which now sits in a range of 2.25 percent to 2.5 percent. The decision to cut the key rate also follows a series of downward revisions in the growth outlook for the local economy.
The Open Leaderboard 2019
It's a special week for Northern Irish golf, a special week for Rory McIlroy and a special week for golf clothing enthusiasts. And maybe it's what will turn this most fiery of golfers into a major champion this week at Royal Portrush.