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The Mavericks ended their 32-win season, most since 2011, with the first postseason appearance since 2003.
Krista Rude scored the game-winning run in the bottom of the seventh to send UTA into the final three.
The Mavericks will await their foe, but will play an elimination game on Thursday at 5:30 p.m.
Sam Clakley tied for fifth in UTA single-season history with her 21st win of the season on Tuesday.
PERSONAL: Daughter of Rafael and Stephanie Denson ... Has two sisters, Mackenzie and Madison ... Father played football at Oklahoma State from 1991-1994.