EUGENE — Welcome to the rivalry.

EUGENE — Welcome to the rivalry.

In the second game of the Civil War softball series at a sold-out Howe Field on Saturday afternoon, the freshmen took center stage.

Oregon's Koral Costa and Janelle Lindvall both hit grand slams and a third freshman, Cheridan Hawkins, threw a four-hit shutout in an 11-0 Pac-12 victory over Oregon State.

The Beavers (32-19, 7-13) came up with key strikeouts and big defensive plays to end threats in the first two innings with OSU freshman, Sarah Shadinger, getting an unexpected start in the circle. Through the team's first 19 Pac-12 games this season, only Tina Andreana and Marina Demore had opened games.

Shadinger had a few moments early, such as striking out senior Samantha Pappas to end the first and getting Oregon's top hitter to pop out with two on to end the third. She also got some good backup from her defense, including a double play to kill UO's momentum in the second.

But overall, Shadinger's performance was erratic with several pitches up in the zone. The fifth-ranked Ducks (44-17, 17-3) eventually settled down to take advantage of walks, especially in the third.

Meanwhile, hard-throwing UO lefty Hawkins added to her list of quality starts by keeping OSU batters in check. She struck out seven of the first eight batters she faced and had nine strikeouts in four innings.

The Ducks found patience at the plate to take advantage of three walks and got the big hit from Costa to change things in a hurry. Shadinger walked in the game's first run and Costa, who stands just 5-foot-5 and was batting eighth in the lineup, followed with a blast to left.

In the fifth, the Ducks added six more runs. Kailee Cuico collected an RBI single, Alexa Peterson worked a bases-loaded walk with Demore in the circle and Lindvall cranked the team's second grand slam.

The two teams end the series today with a 1 p.m. matchup.