2014 victor McIlroy endured as bad as a start as he has ever had to a Major, hooking his first tee shot out of bounds en route to a double-bogey on the first hole - and it didn't get much better from that point onwards.
McIlroy seemed to compose himself on the ensuing holes, even pulling two back on the seventh and ninth.
McIlroy finished at 8-over 79 after 18 holes, which was 12 shots behind leader Shane Lowry after the early wave on Thursday.
World No.33 Lowry admitted he also struggled to keep his nerves in check on the first tee, with the crowds lending strong support to all six players from the Republic of Ireland and Northern Ireland.
"I walked off the front nine pretty p***ed off to be honest and then I holed an eight-footer for birdie on 12 and it relaxed me a little bit. Of course I feel uneasy".
McIlroy hooked his tee shot left into the deep stuff, which struck 34-year-old Anna McKelvey in the stomach and breaking her phone in the process.
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The 15-times major champion carded a one-under 70 but it failed to fix the damage of Thursday when he struggled with back pain and shot an ugly 78.
Duval took two provisionals off the tee and then laboured under the assumption he was playing his third ball before it became apparent it was his second provisional.
"I would like to punch myself", said McIlroy after his nightmare round. "I tried to hack it out back to the fairway, but it didn't come out of the lie".
A pair of birdies in three holes before the turn helped restore some semblance of order and he reeled off six consecutive pars on the back nine before the Northern Irishman's horror show at the 16th. Brooks Koepka is the first big name out on Friday at The Open but, in Portrush, he plays second fiddle to his caddy Ricky Elliott.
McIlroy was not the only superstar to fall short on day one as Tiger Woods followed suit with a dismal 77.
Eventually he found the bottom of the cup for a quadruple bogey and quickly moved to five-over par at the third after his tee shot bounced off the green.