The visiting Titans raced out to a 22-3 first-quarter advantage and cruised from there for the 4A Greater St. Helens League victory on Tuesday.
Lolo Weatherspoon led a balance scoring attack for Union with 14 points. Mason Oberg and Abbey Kaip each scored 12.
Megan Geiger and Faith Prom each had eight points for Battle Ground.
UNION 75, BATTLE GROUND 28
UNION — Lexi Raymore 7, Natalie Paulson 0, Olivia Euverman 5, Mason Oberg 12, Lolo Weatherspoon 14, Sydney Cowling 6, Abbey Kaip 12, Kaneyl Carpenter 4, Caitlyn Leake 3, Mackenzie Lewis 4, Sarah Litchford 6, Ariel Ammentorp 2. Totals 28 (9) 10-11 75.
BATTLE GROUND — Megan Geiger 8, Faith Prom 8, Marissa Maunu 0, Jenna Bergren 0, Mallory Meyer 6, Abby Beall 0, Danielle Arn 2, Yvette Rosales 0, Emma Massie 0, Elizabeth Miller 4. Totals 10 (4) 4-9 28.