Stillwater, Okla. ? Kansas University blew a one-run lead in the bottom of the seventh inning in a 4-3 setback to No. 21 Oklahoma State on Sunday.

With the score tied 2-all in the sixth, KU’s Liz Kocon hit an RBI double to left-center to score Maggie Hull, giving the Jayhawks a 3-2 lead.

But in the bottom of the seventh, the Cowgirls’ Alysia Hamilton led off with a single to right field and advanced to second on a sacrifice bunt. Chelsea Garcia’s double into right plated Hamilton to tie it at 3.

Tamara Brown hit a long single off the right-field wall to send Garcia to third. As the ball made its way from the outfield to Brittany Hile at home plate, Garcia continued home, where her slide kicked the ball out of Hile’s glove to give Oklahoma State the 4-3 margin.

Freshman pitcher Kristin Martinez (12-7) came into the circle in the fifth inning for starter Allie Clark, but gave up OSU’s last two runs.

Kansas fell to 27-14 overall, 0-10 in the Big 12.

OSU moved to 32-9 and 3-3.

KU will travel Wednesday to Texas Tech.