The USGA confirmed that a player had been treated during Tuesday's practice after he aced the par-three seventh, the shortest hole in major championship golf, and became ill.
He was treated at the location and returned to the locker room by cart, it said.
The USGA would not confirm the name of the player but according to a report on GolfChannel.com the distressed golfer was 30-year-old Mid-American champion O'Connell.
He is scheduled to tee off in Thursday’s opening round of the U.S. Open alongside Billy Hurley III and Brian Davis.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
(Reporting by Steve Keating in Pebble Beach. Editing by Ken Ferris)
