Lagman claimed the boys 12-under title after clobbering Jurence Mendoza, 6-4, 6-0.
Largo, for his part, took the championship title in the boys 18-under class, sealing his bid with a 6-2, 6-3 win over Akio Sy.
Tabotabo, the other day, annexed the title in the unisex 10-under class.