The Offaly man is currently 13 shots off the top.
Shane Lowry will have it all to do in order to make the cut at the US Open in Oakmount.
The Clara man shot an opening round nine-over 79 and faces an uphill battle in order to make it to the weekend.
Rory McIlroy also had a tough opening day after shooting a four-over 74, with all of his bogeys coming on the back nine.
Justin Rose who is paired with Lowry and McIlroy sits on seven-over.
The trio will tee off together this evening from 25-past-six.
JJ Spaun leads the field on four-under-par.
J.J. Spaun's 4-under 66 has him at the top of the leader board after Round 1 of the 125th U.S. Open.
— U.S. Open (@usopengolf) June 13, 2025
Ten players finished the day in red figures. pic.twitter.com/f4Ac1AZzfq
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