Sandra de los Santos and Honey Rose Tubino teamed up to lead the defending champions Lady Altas.
Tubino unleashed 28 points, seven of which were blocks while Delos Santos powered her way to 27 points, including 10 blocks.
Gretchel Soltones also shot 28 points in a losing effort for the Lady Stags.
In the men’s tournament, Emilio Aguinaldo College banked on Howard Mojica to beat Letran, 15-25, 25-21, 19-25, 25-9, 15-10 while Perpetual Help blanked San Sebastian, 25-20, 25-20, 25-21.
Mojica scored 26 markers for the Generals while Adam Daquer and Jay dela Cruz had 14 points apiece for the Altas.