Rupert Ohrelle Tortal CONTRIBUTED PHOTO
Unseeded Brent Signmond Cortes and Rupert Ohrelle Tortal shocked their foes on Thursday to advance to the semifinals of the 10-under unisex in the 33rd Philippine Columbian Association (PCA) Open presented by Cebuana Lhuillier and Metro Global Holdings yesterday at the PCA indoor shell clay courts in Paco, Manila.