Former Open champion Francesco Molinari is one shot off the pace after thefirst round of his Safeway Open debut.
Australian Adam Scott and American Andrew Landry lead the pack on seven under par.
Scott, starting on the back nine, had a steady first nine holes with a bogey on the par-four 13th the only blot on his copybook at the turn. Two birdies and an eagle on the front nine secured the Australian a round of 65.
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Landry, meanwhile, put together five birdies in his first nine holes and two more in the second half of his round to share top spot in Napa, California.