Ebesu held the Trojans to three hits and struckout nine batters during the seven innings he pitched.
Hilo (11-3) broke open the game in the fifth inning with six runs
highlighted by an array of singles and a triple by Cortney Arruda.
The Vikings will next play top-seeded Punahou in the second round of the tourney at 7:30 pm at Les Murakami Stadium on Thursday.
Mililani (10-4) will continue in the tournament with a consolation game
on Friday at 10 am against Kailua at Central Oahu Regional Park.