San Diego was led by Noel Frohman's 11 kills and 10 digs.
Cheryl Weaver had 19 kills, seven digs, five blocks and a .471 percentage, while Tayyiba Haneef added 19 kills and 12 digs. Haneef also had a .390 percentage for LBSU.
USD hit .134, compared to the 49ers .320 percentage. Keri Nishimoto had 43 assists for The Beach, while Ali Martin had 28 assists for San Diego.
The Beach took the sweep, winning game three 30-22. LBSU hit .366, USD, .265. Erika Chidester had two blocks as part of a 3-0 run to give LBSU a 23-17 lead. Haneef's kill gave LBSU a 20-16 lead.
The 49ers went up 2-0, winning the second set 30-24. The 49ers rebounded to hit .415, compared to the Toreros .167 percentage. Two straight Weaver kills gave LBSU a 26-21 cushion. The Toreros had used a 7-1 run to close to 21-20, after LBSU led 20-13.
The Beach closed out game one on a 6-1 run to win 30-25. USD had tied it at 24-24. The Niners hit .186, while USD hit .000. The Toreros also tied it 21-21, before three straight points gave LBSU a 24-21 lead. A back-and-forth first game saw LBSU take a 20-17 lead off a Haneef kill and a block.