Senior Caroline Hardy singled in the winning run in the eighth inning as Alabama defeated top-seeded Oklahoma 1-0 at the Women's College World Series on Sunday afternoon.
The teams will play again Sunday night to complete the double-elimination semifinals.
The winning team advances to face No. 2 UCLA in the best-of-three finals beginning Monday. The loser goes home.
Senior catcher Reagan Dykes started the extra-inning rally with a leadoff base hit, and the pinch-runner was sacrificed over to second by freshman infielder Skylar Wallace.
With two outs, pinch-hitter Hardy delivered with a single to center, with Kloyee Anderson coming around from second base andbeating the throw home.
After throwing a 2-0 shutout against Arizona that went past midnight on Saturday night/Sunday morning, freshman Montana Fouts (21-6) went the distance to get the win.
She allowed four hits with five strikeouts and four walks, while throwing 143 pitches against the Sooners.
Giselle Juarez (28-2) took the loss. She yielded four hits, with eight strikeouts and no walks.