Pauline del Rosario rode on a decisive four-birdie spree from No. 9 on her way to a 68 as she poised to blow the field with a four-shot lead over Kim Seoyun and a resurgent Daniella Uy in the second round of the ICTSI Caliraya Springs Championship on Wednesday in Cavinti, Laguna.

Unable to launch her drive in a rare Ladies Philippine Golf Tour appearance with a three-putt miscue on No. 1 Tuesday, del Rosario still wrestled with her putter on No. 5, but this time, she knocked down an eagle and shot five birdies to more than make up for her three-bogey slip for a 35-33 and a 36-hole total of seven-under 137.