Cameron Cranston had 15 points, 10 rebounds and seven assists to lead the Titans to a non-league home win.
Tyler Combs had 15 points and hit four 3-pointers in the second half. Union finished with 12 3-pointers.
The Titans (9-2) jumped to a 25-13 lead after one quarter.
“We moved the ball pretty well in the first quarter,” Union coach Blake Conley said.
UNION 77, PARKROSE (Ore.) 52
PARKROSE (Ore.) — Keandre Burton 19, Justin Tran 4, Donte Mcdaniel 7, Thomas Grant 4, Tyjuan Overton 1, Leyson Farmer 17, Eric Judge 2. Totals 16 (10) 10-12 52.