College Heights fell to Diamond in five sets (25-18, 25-17, 23-25, 22-25 and 16-14) to close out the regular season on Tuesday.
The Cougars close the regular season with a 15-13-2, while the Wildcats close the season with an 11-14-3 record.
Addie Lawrence finished with 20 kills and three blocks to lead CHC. Lauren Ukena had 10 kills, 17 digs and 16 service points, while Maddy Colin had 33 assists and 20 service points. Lindsay Griesemer finished with 24 digs, while Ava Masena had 23 digs. Marley Woodford added three blocks.
Top-seeded College Heights takes on the winner of the fourth-seeded McAuley Catholic and fifth-seeded Liberal in the Class 1 District 9 semifinals at 5 p.m. on Saturday.
Top-seeded Diamond takes on the winner fourth-seeded Marionville and fifth-seeded Southwest in the Class 2 District 11 tournament at 4 p.m. on Saturday.