McIlroy was one of several players who struggled as Norrman, 25, rallied from six behind to win by one at the K Club.

McIlroy was tied for the lead on 13 under when his approach at the seventh hole hit water.

On 11, he did the same thing to drop a shot before making triple bogey at 16.

McIlroy famously hit a spectacular three-wood second shot at the 16th to win his lone Irish Open in 2016. He also eagled the hole in Friday’s second round with a 120-yard shot.

The par five, on the other hand, bit back at him, as he found water with successive fairway woods throughout the final two rounds.

To make matters worse, McIlroy then blasted his ninth-iron fourth shot into the River Liffey and needed to nail a 20-footer to minimize the damage to an eight on Sunday.

McIlroy finished with a 74 and a share of 16th position, five strokes behind the leader.

Norrman started the day tied for 21st and had six pars, but a three at the seventh started a charge of seven birdies over his final 12 holes as he moved into the clubhouse lead on 14 under par with the leading groups only halfway through their back nine.

As New Zealand’s Ryan Fox, Scotland’s Grant Forrest, and Australia’s Min Woo Lee all faltered on the back nine, Germany’s Hurly Long was left as the final contender despite consecutive bogeys on 13 and 14.

Long, despite his near-miraculous escape from the woods, was unable to birdie the penultimate hole, and his long eagle putt at the last failed to drop, confirming Norrman’s triumph.

Long’s second-place finish earned his tour card for 2024, while home player Shane Lowry showed a return to form following his Ryder Cup selection with a closing 68, leaving him tied for third on 12 under with Fox, Forrest, and South Africa’s Thriston Lawrence.

Norrman’s sole other professional success occurred two months earlier in the United States, when he won the Barbasol Championship, which is sanctioned by both the PGA Tour and the DP World Tour.