Jannine Navarro led the Lady Blazers with 17 points while Rossan Fajardo added 14.
CSB finished just eighth in the standings last season but is now at 2-0 early along with fellow unbeaten squads Arellano, Emilio Aguinaldo College and defending champion Perpetual Help.
The Lady Generals whipped listless Mapua, 25-12, 25-17, 25-14.
Charmine Belleza showed the way with 10 points, on three service aces.
The Lady Cardinals dropped to 0-2, absorbing their 11th straight setback after going winless in Season 87.
The Lady Knights also slipped to 0-2.