Borunda, 38, reached this level before. In 2008, Lake Merced Golf Club in Daly City hosted a sectional qualifier and Borunda said the course at the time didn't fit his game.
Borunda said his ball flight was almost exclusively a fade then. Now, he's working on hitting a draw.
"I'm much stronger," Borunda said of his overall game. "I needed to draw the ball at [Lake Merced]. There were four holes that because I couldn't turn the ball over [were difficult]."
Borunda first tried reaching the U.S. Open in 2007 and learned fairly quickly the importance of managing himself and putting in the work.
He said the plan for this week was getting in as many practice balls between lessons and duties in the golf shop.
"It's different than being a tournament player where you're always in the flow," he said.
The opportune practice window for Borunda comes from 6 p.m. to 8:30 p.m. during these days of lengthier light.
"My caddie waits for my call," Borunda said of Mike Gutman, an NBCC member. "He'll help with my confidence."
Borunda had the benefit of playing Newport in the local qualifying round. His three-under-par 68 included six birdies. He birdied all three par-5s.
Knapp also advanced from the local qualifier at Newport with a 69.
Besides himself, Borunda said making it into the 156-golfer field at Congressional would please Newport's members.
"[They] are supportive and generous with me trying to qualify. I know how much it would mean to them."
The Jones Cup could be heading into unchartered territory.
The annual competition of Newport-Mesa's four country clubs has ladies club champions, but one team might have an additional woman in its lineup for this year's tournament June 28 at Big Canyon Country Club.