CALABARZON trounced ARMM, 93-43, on Tuesday to start its title-retention bid in the 2017 Palarong Pambansa secondary basketball tournament in San Jose De Buenavista, Antique.
Region 4-A is being represented by NCAA side San Beda Red Cubs.
National Capital Region picked up its third win in as many games on Tuesday, downing erstwhile unbeaten Soccsksargen, 83-44.
Cordillera Administrative Region beat Negros Island, 75-70, while Western Visayas won, 69-65, over Cagayan Valley.
Davao Region beat Central Luzon, 93-72; Eastern Visayas nipped Mimaropa, 68-67; Region 1 beat Bicol Region, 89-80; and Central Visayas trounced Northern Mindanao, 77-55.