A Duck fights to keep the ball against a Beaver in the fourth period of the semifinal game for the regional championship. The Ducks were tied until the third period but won, 10-5. Oregon will now play Portland State for the regional championship. (Tess Freeman/Emerald)

Oregon’s Kristin Kelley goes after the ball in the second period of the semifinal game. The Ducks beat the Beavers, 10-5. (Tess Freeman/Emerald)

An Oregon State player blocks an Oregon player from getting a pass in the semifinal match of the regional championship tournament on Saturday afternoon. (Tess Freeman/Emerald)

Oregon’s Shelby Hansen looks for an open pass in the fourth period of the game between her team and Oregon State on Saturday afternoon. (Tess Freeman/Emerald)

A pair of Ducks block the ball from an Beaver player’s shot toward the end of the fourth period. Oregon played Oregon State in the semifinals for regional champions on Saturday afternoon. (Tess Freeman/Emerald)

Oregon’s Erin McConaghy attempts to shoot the ball through Oregon State defensive players. Oregon played Western Oregon earlier that day and won 16-0, advancing them to the semifinals against Oregon State. (Tess Freeman/Emerald)