The showdown between the two previous champions is set at 9 a.m. to open a four-match bill.
UE and UP Integrated School collide in the lone girls' match at 1:30 p.m.
NU hopes to make it two in a row despite the graduation of former MVP Lorence Cruz, Pol Salvador, Jules Carlo De Jesus, Jomar Ocampo, Mark Manalo, Dazyl Cayamso, and Jhone Tugas, who all completed their playing eligibility.
The Junior Lady Spikers will still have reigning MVP Angel Canino and last season's 2nd Best Outside Hitter Alleiah Malaluan in tow.
Former champion NU, now under new coach Regine Diego and hoping to move on without its aces Faith Nisperos and Roma Mae Doromal, plays UPIS at 10 a.m., while FEU-Diliman and Adamson take the floor at 1 p.m.
The Blue Eagle Gym will host the Sunday boys tripleheader starting with UST-Ateneo at 10 a.m. UE and NU cross paths at 11:30 a.m., to be followed by the 1 p.m. duel between FEU-Diliman and De La Salle-Zobel.