Spencer Levin leads by three shots at the Waste Management Phoenix Open with a few players still to complete their second rounds.
The 27-year-old kicked off the tournament with a 65 on Thursday and followed it up with a 63 to sit on 14-under par at the halfway stage.
He is three shots clear of Harrison Frazer, who is six-under par for his second round and still has three holes to play after darkness forced the players off the course on Friday.
The highlight of Levin's round was an eagle on the 17th, while he also carded six birdies in a bogey-free round, and the Californian star is looking to stay relaxed over the weekend and see where it takes him.
"Hopefully, I can just keep trying to believe in myself and just keep trying to make my swing, and we'll see what happens," he said. "I'm going to give it my best shot. It should be fun. I'm looking forward to it."
After starting at the tenth hole, Frazer still has the seventh, eighth and ninth to play to complete his second round, and six birdies on Friday helped the 40-year-old establish a three-shot advantage back to John Huh and Webb Simpson, who are both in the clubhouse tied for third at -8 after the first 36 holes.
Kyle Stanley's five-under par 66 sees him sit on seven-under for the tournament, while six players, including Bubba Watson and Jason Dufner, are a shot further back.
Phil Mickelson looked in danger of missing his second successive cut after dropping three shots early in his second round but he rallied to end the day on -4 and move into the weekend's action.
The left-hander admitted that he had been woeful early on but is looking to take the momentum from the back nine into the weekend.
"The front nine, I don't know what to say. I mean, it was just terrible," he said. "I was able to kind of self-correct it a little bit for the back to shoot four under and turn it around.
"It's not what I was hoping for going into the day, but I'm looking forward to playing the weekend and seeing if I can light it up."
With the projected cut set at even-par, England's Ian Poulter just sneaked through on one-under par but there was no such luck for compatriot Brian Davis, who has yet to make a cut this year and finished on five-over par.