Northern Ireland's big hope for a home winner could hardly have begun in worse fashion after hitting his tee shot out of bounds, on the way to a quadruple-bogey to get going.
Two holes later there was another dropped shot before what looked like a small recovery began, with birdies on seven and nine before taking the turn. There was a look a birdie too on the tenth, which went amiss.
From there an embarrassing double bogey came on 16 when a lack of concertration lead to missing a short bogey putt before a triple-bogey on the 18th rounded off a horrible day.
Here is McIlroy's card after a horrendous first day at Royal Portrush…
Rory McIlroy | +3
|In: 31||Total: 65|