The Bruins' Ivey Schmitt and Anastasia Kunz clinched the match at No. 5 doubles.
The Bruins are 3-2 all-time against the Lions, including a 4-1 upset earlier this year at LMU.
The Bruins won their home opener, christening the Sunset Canyon Sand Volleyball Courts with a win.
It is the first-ever match at UCLA's new Sunset Canyon Sand Volleyball Courts.
Madie Smith and Elise Zappia (pictured) won gold while Kamila Tan and Ivey Schmitt claimed bronze.