The final top 20 will earn spots next month in the PGA Championship at Baltusrol in New Jersey.
The 47-year-old Uresti, a PGA Life Member from Austin, Texas, had a 9-under 135 total. He had only 25 putts in the round at Kaluhyat. He opened with a 68 on Sunday at Atunyote, the site of the final two rounds.
''It was a solid scoring day,'' Uresti said. ''I was a little tight and held on to make some putts. I've been playing pretty well. I was working on my putting, speeding up my routine. It seems to be helping.''
Uresti tied for fourth at Atunyote in the PGA Tour's 2006 B.C. Open,
''I did have a good finish here, so that provides a good feeling to draw back on,'' Uresti saud. ''It was a while ago, but it does help a little, actually quite a bit.''
Ryan Helminen, the PGA Teaching Professional at Ridgeway Country Club in Neenah, Wisconsin, was a stroke back after a 69 at Atunyote.
''Even though I'm 41, my game is getting better every year,'' Helminen said. ''Playing in this championship, the state opens, playing with better competition, it makes you better. I feel like I'm still learning. I feel like I haven't peaked. As long as I get better each year, who knows what's out there?''
Rich Berberian Jr. of Derry, New Hampshire, was 7 under after a 69 at Kaluhyat.
Karen Paolozzi of Atlanta was tied for eighth at 3 under after a 70 at Atunyote.