Katharine Williams scored 12 points, Grace Davis added 10, and the Titans used a big third quarter to pull away from short-handed Mountain View.
The Thunder are down to six players after a series of injuries.
Emilly Moore scored 14 to lead Mountian View. Hailey Hartney added 12.
It was a one-point game at the half, but Union took a 10-point lead into the fourth quarter.
UNION 54, MOUNTAIN VIEW 42
UNION — Mailia Aguigui 2, Grace Davis 10, Sarah Garrison 4, Katharine Williams 12, Courtney Cranston 4, Kili Anderson 9, Abby Forsyth 0, Sarah Trostle 7, Emily Takayoshi 5, Avery Hoyt 1. Totals 19 (5) 11-18 54.
MOUNTAIN VIEW — Emilly Moore 14, Caleigh Carlson 5, Jenna Gulliford 2, Katie Hurst 9, Sydney Sullivan 0, Hailey Hartney 12. Totals 16 (5) 5-10 42.
