Lagman smashed second pick Calvin Canlas, 6-0, 6-1, to reign supreme in the unisex 10-and-under while Cordero whipped second-ranked Alberto Villamor, 6-1, 6-2, for the 12-and-under crown.
Of the two, Lagman was the more dominant after conceding only four points three in the semifinals against Pocholo Macalino and one in the finals out of the 64 games he played in the week-long event serving as the final stop of the nine-leg national age-group circuit.
Second seed Aiko Sy, for his part, stunned top pick Gerard Ngo, 6-2, 7-5, to top the 14-and-under section while Regina Santiago kept order in the girls 12-and-under with a 6-1, 6-3 trouncing of JV Custodio to rule her bracket.
On her way to the finals, Santiago ran into Clarice Patrimonio, one of three tennis-playing children of former PBA star entered in this tournament, pulling off a 6-3, 6-4 victory.
Christine Patrimonio, who eked out a draining 6-3, 1-6, 6-1 triumph over Sarah Jane Lim in Saturdays semifinals, suffered the same fate as she was shell-shocked by No. 2 Zhane Quitara, 1-6, 3-6, in the 14-and-under finals.