Florence Bisera and Lucy Landicho matched 78s and Pamela Mariano carded a 79.
Gretchen Villacencio posted a 76 while Sarah Ababa bogeyed 16 and made a double bogey on the next for a 77 as she slipped to joint seventh with Eva Miñoza.
Korean Lee Jiwon skied to an 83 but still led Mafy Singson, who birdied the last hole for an 84, by one in their duel for low amateur honors.
Daniella Uy closed out with back-to-back birdies to wrest a two-stroke lead over Chihiro Ikeda and Marvi Monsalve in the ICTSI Villamor Philippine Masters at the Villamor Golf Club Wednesday.
Shaky off the mound all day, Uy banked on her big recovery shots to get going, birdying the tight first hole and the par-3 fourth.
“I saved a lot of pars, laging stymie ang drive,” said Uy, hoping to bounce back from successive misses in her last two outings.
Ikeda, the reigning Order of Merit champion, mixed three birdies against the same number of bogeys to match Monsalve’s even-par card in hot conditions.
Monsalve, toughened up by stints in the Thai LPGA, holed out with a birdie on the ninth, her closing hole, to line herself up for a crack at a first LPGT diadem.
“It was a pretty wild round. Actually, I made a lot of bogeys — five,” Monsalve said.
Korean Kim Seoyun, also due for a big finish after a close brush with the championship at Caliraya Springs, birdied the 18 to rescue a 74 while Constantino hobbled with a four-bogey, one-birdie card on a course she calls home for a 75.
The leading scores:
70 — Daniella Uy
72 — Chihiro Ikeda, Marvi Monsalve
74 — Sarah Ababa, Kim Seoyun
75 — Harmie Constantino
77 — Eva Minoza, Gretchen Villacencio
78 — Florence Yvon Bisera, Lucy Landicho
79 — Pamela Mariano
80 — Rev Lizbeth Alcantara, Monica Mandario
83 — Apple Jeen Fudolin, Lee Jiwon (am)
84 — Sheryl Villasencio