NORMAN, Okla. -- Nebraska was unable to hold a seventh-inning lead against No. 13 Oklahoma on Saturday, as the Sooners scored twice in the bottom of the seventh inning to rally for a 5-4 victory in game one of a doubleheader.

Nebraska led 3-0 early and then scored a run in the top of the seventh to take a one-run lead into the bottom of the seventh. But back-to-back one-out doubles tied the game before a two-out, walk-off single from Callie Parsons lifted Oklahoma (13-5) to its 16th consecutive home victory.

Missed opportunities cost the Husker offense, as Nebraska stranded nine runners in the loss. Despite scoring three runs in the first inning, NU struck out three times with the bases loaded. Then in the seventh, Nebraska had the bases loaded with one out after grabbing the 4-3 lead but failed to add another run.

That set the stage for Oklahoma's rally in the bottom of the frame. The rally made a winner of Kelsey Stevens (8-3), who allowed four runs in a complete-game effort. Senior right-hander Tatum Edwards (6-3) took the loss for Nebraska, allowing five runs in 6.2 innings. Edwards struck out eight but hit three batters and issued three walks.

Edwards also did her part at the plate, finishing 3-for-4 with a pair of RBIs, including the go-ahead RBI single in the top of the seventh. Her twin sister Taylor was 1-for-3 with a walk, as she extended her hitting streak to 20 games, the second-longest streak in school history. Sophomore Dawna Tyson went 2-for-4 with an RBI.

Nebraska scored three times in the top of the first inning to jump out to an early lead. Sophomore Kiki Stokes drew a leadoff walk before Taylor Edwards lined a single down the left field line. A passed ball moved both players up a base before sophomore Hailey Decker walked to load the bases. Following a strikeout, Tatum Edwards and Tyson provided back-to-back RBI singles. Leading 2-0 and with the bases still loaded, a strikeout marked the second out of the inning. With two outs, freshman Kat Woolman worked a five-pitch walk to score Decker and stretch the lead to 3-0. A third strikeout ended the inning, as the Huskers left the bases loaded.

In the bottom of the frame, a hit batter and a double put Sooners on second and third with one out. But Nebraska threw out a runner at home on a ground ball to freshman MJ Knighten at third before Edwards escaped the jam with a strikeout.

Oklahoma tied the game with a three-run fourth inning. A one-out double and single put Sooners on second and third, before OU's first run came home on a wild pitch. Following a strikeout, a two-out RBI double trimmed the lead to 3-2. Back-to-back walks then loaded the bases before a third consecutive walk forced in the tying run.

Still tied 3-3 in the top of the seventh, Stokes led off with a walk and promptly stole second base. Taylor Edwards was then intentionally walked and on ball four, the ball squirted out of the glove of the catcher, allowing Stokes to move up to third. A foul out marked the first out before freshman Austen Urness drew a four-pitch walk to load the bases with one out. Tatum Edwards then grounded a 1-2 pitch through the left side for an RBI single that gave the Huskers a 4-3 lead. Nebraska missed a chance to add an insurance run, and it proved costly when OU scored twice to earn a walk-off victory in the bottom of the seventh.