Rory McIlroy insists he is still in contention after reaching the halfway mark of the AT&T Pebble Beach Pro-Am six off the lead, with Shane Lowry a further shot back.
A birdie at the last took the defending champion McIlroy to nine-under-par after a second-round 67 at Pebble Beach, trailing second round leaders Akshay Bhatia and Ryo Hisatsune.
American duo Rickie Fowler and Sam Burns are a stroke off the lead, two clear of a group which includes Austria's Sepp Straka.
Matt Fitzpatrick is in a large group on 10-under-par with fellow Englishman Tommy Fleetwood among those level with McIlroy.
McIlroy made a strong start, eagling the second and adding two more birdies, before dropping shots either side of another pair of birdies after the turn.
"I feel like I wasted a few shots out there or at least just wasn't efficient with my scoring and didn't capitalise on my good start the last couple of days," he told Sky Sports.
"I played pretty good but with the weather coming in on Sunday, tomorrow's going to be a really important day to get yourself in position.
"Sunday looks like it could be pretty messy and a lot of things could happen, so the closer you are to the lead Sunday the better. Even if I am a few behind going into Sunday, everyone will have a chance given those conditions."
Bhatia carded an eagle and six birdies in an eight-under-par round of 64 at Spyglass Hill to move alongside overnight leader Hisatsune at 15-under.
After his 67 on Thursday, Lowry had to settle for a second-round 69. Starting at the 10th, he to to the turn three under for his round, but back-to-back bogeys on 10 and 11 halted his momentum.
He recovered with birdies at four and eight - his 13th and 17th holes of the round - to stay in the hunt for a good weekend.
World number one Scottie Scheffler picked up five shots in his last seven holes to move to six-under-par.
