The Bruins are 8-2 against the 2014 NCAA field and enter with the nation's best record at 27-3.
Danny McClintick scored a team-high three goals to lead the Bruins (photo by John Hilinski).
Garrett Danner had 12 saves, but the Bruins' offense scored the fewest goals in six years.
Senior Daniel Lenhart led the Bruins with a hat trick against the Gauchos.
The Bruins will face the winner of No. 8 Pacific/No. 9 UCSB on Friday at 3:00 p.m. at Long Beach St.