The Clara man found the water twice on the final hole.
A quadruple bogey on the 18th leaves Shane Lowry on four-over heading into his second round at golf's Players Championship.
The Offaly man found the water twice on the 18th, and ended up finishing on with a round of 76.
Defending champion Rory McIlroy is seven shots behind the leaders, on two-over-par alongside Séamus Power.
Five players are joint top on five under par.
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Full Interview: The Down's Manager Dermot Power
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