Tom Scherrer moved into second place with a matching 69. He stands one stroke behind Walker at minus-5. Greg Bruckner, who shared the lead with Walker after the first round was completed Friday morning, and Brian McCann share third place at 4-under-par 136, with Jon Mills one shot back at 3-under 137.
Play was suspended due to darkness for a second straight day, this time at 6:45 p.m. ET. Just three players remained on the course with Dan Stone hovering on the projected cut line of 4 over through 16 holes.
Those players will return to the course at 8:30 a.m. Saturday. The third round will begin at 10:20 a.m.
Walker had a steady start to his round as he ran off six consecutive pars from the 10th to open his round. He got on the board as he drained a birdie at the par-3 17th.
'The conditions were much tougher out there today,' Walker said. 'I didn't hit it as well today as I did yesterday but I managed to make a few putts.'
Around the turn on the front side, Walker found trouble. He stumbled to his first bogey of the day at the par-4 second at Panama Golf Club.
The 25-year-old made up for that error with back-to-back birdies from the fourth to get to 7 under. On the way to the clubhouse, he faltered to another bogey at the seventh to end at minus-six.
'I'm just trying not to make bogeys,' said Walker. 'I left a couple of birdie putts just short, right in the heart. But overall I'm pleased with the round. I'm looking forward to the weekend. Pressure is fun. I was chomping at the bit to play golf again.'
Scherrer had a difficult opening nine. He dropped a shot at the par-5 12th, but managed to fight back to birdie the 14th. Trouble loomed as he bogeyed the following hole.
After running off six pars in a row, Scherrer ran home an eagle at the par-5 fourth to get to 5 under. He parred out to finish alone in second place.
'It is tricky out there,' said Scherrer. 'No one is familiar with the course so that keeps scores in check. By Sunday afternoon this is going to be one firm golf course.'
Bob Heintz notched a 1-under 69 for the second straight day to move to 2-under-par 138. He is joined there by Bryant Odom (70) and Jason Caron (71).
Paul Gow posted a 2-under round of 68 to climb to minus-1. Joining him there are Nick Cassini, Jeff Freeman and Jeff Klauk. Doug Barron, Rafael Gomez and Chris Zambri are tied one shot further back at even-par 144.