Katie Tesch paced the host Wolverines in kills with eight, followed by Chelsie Rohrs, six; Krissa Hetletvedt, four; and Christine Haden, three.
Tesch also led SOS in digs with 23, while Haden tallied 18, Rohrs 13, and Kari Wester 10. Wester led her team in assists with 12, and Taylor Julian totaled nine. Rohrs also registered one stuff block.
Tesch recorded six ace serves to lead the Wolverines in that department, while Julian registered two.
"We played well tonight. We were able to dig the ball and extend the rally in each game. We also served tough," said SOS coach denise Erdmann.
South O'Brien ends the 2008 season with a 7-20 overall record, and a 2-7 War Eagle Conference slate.