Gerst, a senior, had 12 kills, and sophomore Price delivered 11 kills, 16 assists and two aces for the Cougars. Senior Hailey Nieveen added two kills, three aces and two assists for the winners.
The Cougars improve to 5-3 on the season with the win.
Cornerstone won the JV match by a 2-1 final.
LCA hosts Churubusco Thursday with the JV match starting at 6 p.m.