In the consolation bracket, De Leon edged UC Santa Barbara's Stephanie Yamada, 6-3, 6-4 in the quarterfinal, but fell to the tournament's third-seeded player, Northwestern's Erin Larner, 6-4, 6-0 in the semifinal.
The doubles team of Sarah Nuno and Karla Portalatin played an extra doubles match, wining 8-1, against a combined doubles team with players from Fresno State and UCSB.
The Titans return to action on Friday at the CSUN Matador Invitational.
SATURDAY'S RESULTS
Singles Consolation Quarterfinal
Camille De Leon (CSF) def. Stephanie Yamada (UCSB), 6-3; 6-4
Singles Consolation Semifinal
(3) No. 61 Erin Larner (Northwestern) def. Camille De Leon (CSF), 6-4; 6-0