UST barely got past Far Eastern University, 16-25, 24-26, 25-18, 25-22, 15-11, while Adamson recovered from a 0-2 deficit to defeat Ateneo, 17-25, 20-25, 25-16, 25-14, 15-9.
The lone Visayan squad standing in the semifinals is University of St. La Salle, surviving a hardfought 25-21, 25-22, 27-25 win over Central Philippine University.
UAAP champion De La Salle University, meanwhile, made short work of University of the Philippines-Diliman, 25-13, 25-12, 25-17.
The Lady Stingers face the Lady Falcons in the semifinals, while the Lady Archers clash with nemesis Tigresses in the other match up.
In the men’s volleyball, Adamson and FEU set up a final four clash while USLS and UST also dispute a ride to the finals of the annual meet.
The semifinals of both divisions start Saturday at the USLS College covered courts in Bacolod City.