The Tartans (3-0) will face Montclair at 4 p.m. today in the championship game at San Dimas High School.
The Tartans broke open a 2-1 game with three runs in the fifth inning. Alisha Brown hit a one-out home run, then Bailee Kirst drove in two more with a two-out single. Kirst had three RBIs to lead the Tartans.
Wednesday’s first round at San Dimas
Montclair 5, El Rancho 4
Bonita 5, San Dimas 2
Wednesday’s quarterfinals
Glendora 11, South El Monte 0
West Covina 10, Whittier Christian 1
Thursday’s quarterfinals
Charter Oak 3, Los Altos 2
Montclair 6, Bonita 2
Friday’s semifinals
Montclair 5, Charter Oak 1
Glendora 6, West Covina 2
Saturday’s championship
Glendora 6, Montclair 3