NORMAN, Okla. -- Behind a seven-hit shutout from freshman Emily Lockman and a solo home run from junior Tatum Edwards, 25th-ranked Nebraska handed No. 1 Oklahoma its first loss at 1-0 in the second game of a Saturday doubleheader at the OU Softball Complex.

Saturday's win against the Sooners marked the first win against a No. 1 opponent in that team's home stadium and the second win against a No. 1 opponent.

"I thought it was a really gutsy effort by Emily [Lockman], and I felt like we came back out in the second game and responded well after a tough loss in that first game," head coach Rhonda Revelle said.

Lockman scattered seven singles and working around five walks to post her third shutout of the season. Lockman added three strikeouts while improving to 5-1.

Ultimately, the Sooners' best chance to score came in the bottom of the first inning, when Shelby Pendley hit a two-out single into shallow center field. On the hit, Jessica Shults attempted to score from second, but she was thrown out by freshman center fielder Kiki Stokes.

Lockman escaped another jam in the fourth, when the Sooners had runners at second and third with no outs but failed to score. Oklahoma did not get a runner past second base the rest of the game.

Lockman retired first-team All-American Lauren Chamberlain for the first out following a leadoff single in the seventh inning. After walking Shults, another All-American, with two outs to put Sooners on first and second, Lockman faced Keilani Ricketts, the reigning USA Softball Player of the Year. Ricketts fouled off six consecutive two-strike pitches. Lockman countered with a 0-2 changeup that caught Ricketts looking for strike three and prompted a big celebration from the Huskers.

"I knew that I had to keep going at her every pitch because I knew that she could win the game with one swing," Lockman said. "It felt pretty awesome [to get that last out]. It was great."

Nebraska managed only two hits in the game and had just three base runners, but Edwards hit a towering home run down the left field line to lead off the top of the fifth inning.

The home run was Edwards' fourth of the season and marked the first time in eight games against ranked opponents that Oklahoma had trailed.

"I was looking for something down because I had gotten beat on up pitches [early]," Edwards said. "I just tried to stay calm and keep my eyes steady. I just wanted to get my swing off. Right when I hit it I knew it was square on my barrel, but I wasn't sure how far or high it went until I got to first base."

With the win, Nebraska improved to 12-5 on the year, notching its second win against a top-25 opponent. The Sooners fell to 17-1 with the loss. Michelle Gascoigne (7-1) fired a two-hitter and struck out seven in a losing effort.