De Castro fired 12 of his 14 points in the fourth quarter including a 15-foot jumper before time expired as he lifted the Freezer Makers to their third win in seven outings.
"We blew away a big lead early on because of overconfidence. But mental toughness saved us in the end," said Ana Freezers team owner-coach Rudy Mendoza.
Meanwhile, Chester Tolomia buried a triple at the buzzer as defending champion Shark Energy Drink escaped with a 78-76 win over rival Welcoat Paints. — Joey Villar