With Oklahoma State trailing 6-5, Christian Funk led off the bottom of the 10th with a single and moved to third on a fielding error. Pinch runner Noah Sifrit scored on a single by Navigato to tie the score at 6. Garcia's hit came with two outs.
Third-seeded Oklahoma State (35-18) advanced to play fourth-seeded West Virginia in the championship game later Sunday.
The TCU-Oklahoma State game was moved from Saturday night because of bad weather. TCU had defeated the Cowboys 13-6 earlier Saturday to force a second game.
On Sunday, TCU's Austin Henry hit a solo shot in the top of the 10th to give the Horned Frogs (32-26) a 6-5 lead.
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