Jordan Spieth carded a five-under 67 at Spyglass Hill to take the lead at the half-way stage of the the AT&T Pebble Beach Pro-Am.
Spieth, searching for his first win since the 2017 Open at Royal Birkdale, followed his first round 65 to be 12 under for the tournament and was a shot ahead of fellow American Daniel Berger after his rounds of 67-66, with Sweden's Henrik Norlander alone in third place a further stroke away after a 70.
Spieth opened with a bogey-free two-under 34, then thundered home with four birdies in his last six holes.
Seamus Power, like on Thursday, was unable to shoot under par and as a result, missed out on a place at the weekend having shot successive level-par 72s.
Starting on the back nine, the Waterford native found himself two over at the turn, but rallied with three birdies in a row from the third to fifth holes to sit inside the cut mark with two holes to play.
Unfortunately, a bogey on his penultimate hole, the eighth, cost him a place in the final two rounds at the iconic venue.
Ryder Cup hopeful's Tom Lewis and Paul Casey were well in contention, as Lewis shot a three-under 69 to be in a trio of players sharing fourth place at nine-under, along with Casey, who shot a 67, while overnight leader Patrick Cantalay shot a disappointing 73 following his majestic 62 on Thursday to join the English pair.
Starting on the back nine, the 30-year-old Lewis had a single birdie in a blemish-free front half before a more lively homeward nine, with two birdies and an eagle offset by two bogeys in his last four holes.
The 43-year-old Casey birdied his first two for the day, gave a shot back at the fifth, then made two more birdies in a four-under front nine. He was solid coming home, with birdies on the 11th and 18th alongside seven pars.
Scotland's Russell Knox was on eight under after a 70, England's Ben Taylor was on four under after an even 72, while his countryman Luke Donald missed the cut.