Seamus Power is best of the Irish after the opening round of the Houston Open in Texas.
The Waterford native is four shots off the lead after an opening round of one-under-par 69.
Rory McIlroy is a shot further back, with Padraig Harrington on four-over.
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Leona Maguire is two-under-par after the opening day's play at the LPGA Tour's Ford Championship in Arizona.
Charley Hull of England leads the way on nine-under.