Home favourite Rory McIlroy suffered a nightmare start, including an opening-hole quadruple bogey, while Ireland's Shane Lowry took the clubhouse lead as the British Open returned to Royal Portrush for the first time since 1951 on Thursday.
Organisers, the R&A, are anticipating the second-biggest ever Open attendance, with 237,750 people expected to come through the gates this week in Northern Ireland, but spectators were left stunned by McIlroy's immediate collapse.
He briefly battled back after a bogey at the par-three third hole, but missed a tiny putt to double-bogey the 16th, tripled-bogeyed the last and eventually carded a disastrous eight-over 79.
"I guess when you play your first and last holes in a combined seven over par you are starting on the back foot," said McIlroy.
"The first hole was the first hole, it was a rough start but I felt like I showed some good resilience after that and played the next 12 or 13 holes in two under par and then really what I'm disappointed about is I undid all that good work in the last few holes." The 30-year-old is already 12 strokes adrift of clubhouse leader Lowry, who rolled in five birdies in a fine four-under-par round of 67.
World number 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 felt uncomfortable on the first tee, I was glad it was downwind so it was only a three iron," he said.
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"It's the British Open, it's in Ireland. I feel like I'm hitting it well. Of course I feel uneasy." The 32-year-old Lowry is one shot clear of six players who signed for three-under 68s -- Swede Alex Noren, former US Open champion Webb Simpson, South African Dylan Frittelli, Sergio Garcia, Scotland's Robert MacIntyre and Thai Kiradech Aphibarnrat.
Four-time major champion McIlroy, who fired a course-record 61 at Portrush at the age of just 16 in 2005, was given a huge reception on the first tee as the crowds huddled around the opening hole for a sight of the local hero.
However, cheers soon turned to stunned silence and then groans as McIlroy hooked his opening iron shot out of bounds, hitting a watching fan and reportedly breaking her mobile phone in the process.
The world number three then pulled his second shot from the tee into the rough, he had to take a drop after finding an unplayable line next to the green and two-putted to post an eight on the par-four first.
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