Leona Maguire will fly the Irish flag at the second major championship of the LPGA season.
The Cavan woman will tee off at the Women's US Open just before 7:15 Irish time.
Three players share the early lead of three-under-par at Erin Hills in Wisconsin.
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Shane Lowry is in opening-round action at the Memorial Tournament in Ohio.
The Offaly native is three-under-par through nine holes and tied for second at Muirfield, two shots off the lead.
That's now held by Ben Griffin, who's five-under midway through his opening round.
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Conor Purcell is five strokes off the lead at the Austrian Alpine Open.
The Portmarnock golfer carded an opening-round 68 for two-under par.
Germany's Marcel Schneider is the clubhouse leader on seven-under.