The Bruins completed their third sweep of the year and the first against the Golden Bears.
The Bruins get wins at No. 4 and No. 5, but drop the top three flights.
In their best showing against the 49ers, the Bruins were up 2-0 and had a match point, but fell 3-2.
The Bruins and the 49ers will meet at 1:00 p.m. at the Sunset Canyon Sand Volleyball Courts.
The Bruins had a banner day, winning all three divisions of the Stanford Pairs Tournament.