Padraig Harrington has missed his third cut in four events at the Northern Trust Open.
The Dubliner posted a one-under-par 70, including three birdies, which, although it was a big improvement on his disastrous opening 75, was not enough as he missed out by two shots.
Darren Clark did not appear on Friday because of a chest injury.
South Korean Sang-Moon Bae is hoping to learn from his mistakes after reaching the halfway stage with a one-shot lead.
The 27-year-old led the way going into the weekend at the same tournament last year, only to blow up during his third round.
He is determined to right that wrong, though, after a bogey-free five-under 66 put him ahead of the pack on Friday.
"It was really, really good experience, and I learned a lot," Bae said on the tournament's official website. "I improved a lot from last year."
He leads Aaron Baddeley and Robert Garrigus by a shot on nine under, with Baddeley going for a first Tour win since winning this tournament in 2011.
The Australian was in danger of being an also-ran in 2014 until he found some form on the back nine, birdying six of the holes including four in a row to the finish.
Charlie Beljan is fourth on the ladder on seven under, with first-night leader Dustin Johnson one of four players on six under. Johnson struggled to repeat this Thursday form and signed for a one-under 70.
England's Lee Westwood is three under in his first tournament since parting company with coach Sean Foley, with compatriot Ian Poulter just surviving for Saturday and Sunday after a one-under round left him level.