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.
Rory McIlroy of Northern Ireland tees off on the fourth hole at Pebble Beach (Nic Coury/AP)
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.
We need your consent to load this Social Media content. We use a number of different Social Media outlets to manage extra content that can set cookies on your device and collect data about your activity.
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.