David Hearn, who won this year's Alberta Classic, carded the only bogey-free round on Thursday. He shot a 3-under 69 and is alone in third place.
Former Georgia Tech standout Bryce Molder, Nathan Green and Han Lee all shot rounds of 2-under-par 70 and are knotted in fourth place at Midland Country Club.
Chilly temperatures and difficult greens greeted the players on Thursday and only 11 players broke par.
Herrera wasted little time in breaking into red figures. He reached the green with a 3-wood for his second shot at the par-5 second hole, and drained the 12-footer for eagle.
Herrera elected to lay up short of the green with his second shot at the par-5 fourth. He hit a wedge to 5 feet to set up birdie at the hole, but dropped a shot when he missed the green with his approach at No. 6.
At the par-4 10th, Herrera holed a 12-footer for birdie and ran home a 10-foot birdie putt at the 12th. Herrera tallied his fourth birdie of the round at the 14th, when he tapped in a 3-footer, but trouble loomed for the former PGA Tour player.
He knocked his 5-iron tee ball at the 189-yard, par-3 16th to the back fringe. Herrera could not get up and down for par, so he fell into a tie for first.
'I scored well, but didn't play very good,' admitted Herrera, who needed only 24 putts on Thursday. 'Today I kept it in the short grass. Today I thought I didn't need to go for it because the course is playing tough.'
Gove did not have as strong a start as Herrera, but played solidly enough. His tee shot at the par-3 third went long and left and he failed to save par. Gove collected back-to-back birdies from the sixth, but bogeyed the seventh.
Gove opened the back nine with a short birdie putt at the 10th. He made it two in three holes with an 8-footer at the par-5 12th. Gove drained a 10-foot birdie putt at 14 and closed out his outstanding back nine with a 12-foot birdie putt at the last.
'I'm hitting the ball good enough to compete most weeks, but when you don't make putts, the momentum never gets going,' said Gove, who leads the Nationwide Tour in greens in regulation and is eighth in driving accuracy. 'These are putts I haven't been making. I played good.'
Joe Daley, Michael Long, Brad Fabel, Bubba Watson and Jason Caron share seventh place at 1-under-par 71.