Sepp Straka fired a second successive 65 to take a three-shot lead at the halfway stage of the AT&T Pebble Beach Pro-Am.
The Austrian Ryder Cup player, who won The American Express tournament last month, carded his second successive seven-under-par round at Pebble Beach before the worst of the weather arrived.
Overnight leader Russell Henley, who added a second round 69, shares second on 11-under-par with Australian Cam Davis after his 68 on the Spyglass Hill course.
Justin Rose added a 69 at Spyglass Hill to his opening 65 to be among a group on 10-under-par which also includes American Tony Finau and South Korea’s Tom Kim, who both matched Straka for the lowest round of the day.
Rory McIlroy hole a 25-foot putt to eagle the 18th at Pebble Beach for a round of 70, which drops him into a large group on eight-under-par.
The Northern Irishman, who opened with a 66, picked up four birdies in his opening seven holes, but four dropped shots in six holes from the 12th dropped him off the pace.
Among those alongside him in a tie for 13th are Ireland’s Shane Lowry, who also shot a 70, Denmark’s Rasmus Hojgaard and American major champions Collin Morikawa and Justin Thomas.
World number one Scottie Scheffler, playing his first tournament of the season after a hand injury, is a shot further back after rescuing par from the beach on the 18th at Pebble Beach for a round of 70.
McIlroy’s playing partner Ludvig Aberg, who opened with a 77, withdrew before the second round due to illness.
The final two rounds are played without the amateur partners at Pebble Beach.
