Clara Mantaux lost the first set of her singles match and needed the third-set tiebreaker to win.
Sybille Gauvain and Tamara Culibrk were up a set in singles when the match was stopped.
Gauvain becomes the second Spartan to earn All-Mountain West singles honors four times.
Three San Jose State players experienced Mountain West Championship success in 2017.
The decision came down to Miyo Kobayashi's match at #3-singles.