Freshman Mele Tausinga led off the bottom of the seventh inning with a home run as Nevada came all the way back from a 5-0 deficit to slip past UC Santa Barbara.
Tausinga had two home runs on the day, and Kenzi Goins drove in two runs with a homer as well. Starting pitcher McKenna Isenberg moved to 17-12 on the year, allowing 11 hits and striking out five batters.
Sierra Altmeyer had two hits, including a home run, for UCSB. Melanie Menor also drove in two runs.
Nevada will play the winner between Cal Poly and Pacific in the upper half of the bracket Wednesday, while UCSB will play the other team.