A round of 65 helped American Brandt Snedeker take a three-shot lead into the weekend at the Safeway Open.
The Nashville native climbed three places at Napa Valley going out in 32 and back in 33 to sit 13 under par.
His round followed Thursday's 66 and included eight birdies - one on a 37-foot putt on the sixth - with the only blemish on the books a four on the par-three seventh.
Ireland's Seamus Power missed the cut but just one shot with another mixed round to add to his opening round of 71.
It was a nightmare start for Power who bogeyed his opening two holes before eventually hitting five birdies and another two bogeys for another 71.
The standout performance of the day came from American Ricky Barnes, who had 11 birdies in a clean round of 61 to move up 126 places into tied-eighth.
Overnight leader and tour debutant Sepp Straka fell four places after carding a 72 to sit on nine under overall, along with Kevin Tway and Sungjae Im.
Ryan Moore, Phil Mickelson and Michael Thompson are all a shot ahead on 10-under, while Scot Martin Laird is the highest placed Brit on seven-under and tied for 14th after a round of 70.
