Tyler Copp scored 23 points and Taiwanese exchange student Jeff Wu added 20 to lead the Titans to a non-league win.
Mountain View led by 10 after the first quarter, but Union cut the margin to four by halftime. Union took control with a 25-14 advantage in the third quarter.
Taylor Drey had 22 points to lead Mountain View.
UNION 80, MOUNTAIN VIEW 72
UNION — Tyler Copp 23, Jeff Wu 20, Trent Cowan 8, Seaver Whalen 8, Kyle Mercer 3, Micah Paulson 8, Skillful Davis 6, Micah Merfeld 4. Totals 19 (9) 15-20 80
MOUNTAIN VIEW — Shane McCauley 16, Luke DuChesne 18, Taylor Drey 22, Akash Sanghera 3, Alex Torson 9, Nolan Biggs 4, Dion Rockmore 0. Totals 14 (9) 17-25 72.