Oregon leadoff hitter Samantha Pappas opened Saturday's Womens' College World Series elimination game against Tennessee by blasting a home run over the center-field fence, and the Ducks went on to beat the Volunteers 3-1.
Oregon (45-17) advances to face top-seeded California at 8:30 p.m. Saturday, with the winner playing Alabama on Sunday for a spot in the WCWS' best-of-three championship series.
After Pappas' home run, second baseman Kaylan Howard doubled to left-center and scored when Kailee Cuico singled down the left-field line.
Tennessee scored its lone run in the second inning, when Ashley Andrews was brought home on an RBI single by Tory Lewis.
Oregon added its final run in the fourth inning on Alexa Peterson's RBI double.
Ducks starting pitcher Jessica Moore threw just 83 pitches in the contest and improved to 33-14 on the season.