Rosales could’ve actually barged into the top 10 and closed in on the leader, who shot a 68, but just couldn’t sustain her fiery 32 at the frontside of the Locust Hill Country Club course. She closed her backside stint with a 39, dropping strokes on Nos. 14 and 16 while parring the rest of the holes.
With a 143 aggregate, the 22-year-old Rosales, who has two top 10 finishes in 14 starts, stood seven strokes off Davies heading into the final 36 holes of this event.
Davies, the big-hitter from England who is a 19-time winner on the LPGA Tour but who missed the cut in five of her previous seven tournaments, shot a second straight 68 to post a one-stroke lead over Brandie Burton, who had a 69 for a 137.
Like Rosales, Dorothy Delasin struggled on her homeward trip as she fumbled with a 40 and settled for a 74 that dropped her to 31st place at 145 with seven others.
Delasin, who had three top 10 finishes and earnings of $180,138 in 13 tournaments this year, birdied Nos. 2 and 3 but failed to keep her form as she blew that two-under card right on the next three holes, two of which she bogeyed. She gunned down another birdie on No. 8 for a 34.
But a double-bogey on the par 4 16th ruined her bid and Delasin limped with a 74 after holing out with another bogey on the 18th.
First-round leader Leta Lindley, who is winless in seven years on the tour, slipped to 145 after a 78 while defending champion Meg Mallon, a 13-time tour winner, shot a 74 for a 143.