John Cauilan paced the Bullpups, who improved to 10-1, with 23 points and 15 boards off the bench, while Hubert Cani added 16 points.
A 25-point effort by Henri Subido went down the drain as the Junior Archers lost control in the payoff period and were only held to just nine points.
Meanwhile, University of Santo Tomas kept its hold of the third spot with a 71-62 win over also-ran Adamson in the other juniors game.
Five Tiger Cubs scored in double digits with Alvin Baetiong leading the way with 15 points and 13 rebounds, along with one assist, steal and block.
La Salle-Zobel slid down to fifth with a 5-6 record, behind Ateneo, which totes a 6-5 slate.
Keanu Asistio scored 16 points and hauled down 12 rebounds for the Baby Falcons, who remained at the cellar with a 2-9 card.