The Greenies entered the NCAA as the Junior Reps of then De La Salle College in 1968. LSGH took over the slot of the phased out De La Salle College High School which also had the same monikers-the Greenies. That initial NCAA stint of the LSGH Greenies lasted until school year 1980–81 when both DLSU and LSGH formally and simultaneously withdrew from the NCAA. Within that 13-year NCAA period, the Greenies won eight NCAA General Championships. DLSU together with LSGH withdrew from the NCAA due to several brawls between LSGH and main rivals Ateneo de Manila High School, and between DLSU and main rival school Letran. And when DLSU applied for the UAAP in 1981, a number of schools (mainly UST and Ateneo de Manila, because they stated that La Salle's entry would spark the infamous rivalry and thus start riots once more) rejected La Salle's application. But after a thorough review by the then UAAP board, they finally accepted La Salle as the eighth member. Ateneo de Manila also rejected LSGH's application after LSGH's athletes were involved in various riots with some Ateneo Blue Eaglets while they were in the NCAA, this delayed DLSU's spot in the UAAP, thus forcing DLSU to choose the newly established De La Salle–Santiago Zobel School as their representatives in the Juniors' Division.