Oklahoma State stunned No. 1 Oklahoma, defeating their in-state rivals 4-3 to claim their first Big 12 softball title Saturday.

The Cowgirls took the lead in the top of the eighth, loading the bases with nobody out before Kiley Naomi took a four-pitch walk from Nicole May.

Oklahoma State hung onto the 4-3 lead, with Morgan Day closing out the game, shutting down the Sooners from the mound.

The victory marks the program’s first-ever Big 12 title and Oklahoma State’s first conference championship since the Cowgirls won the Big Eight regular-season trophy in 1995.

“This is another feather in our cap as a program,” head coach Kenny Gajewski said. “We just have to keep doing things we haven’t done before. We hadn’t won the Big 12 tournament, now we have. We need to keep winning and continually build.”

The Cowgirls’ historic stand puts them in a promising position for Sunday’s NCAA selection day, where seeding for the NCAA Tournament will be revealed.