The Beavers' win on Sunday, coupled with Arizona's 8-7 victory over Arizona and Stanford's win versus Cal, means Oregon State finishes in fourth in the Pac-12 with an 18-12 league record. The Beavers finished the regular season with a 38-18 overall record, matching their win total from a year ago.
On Sunday, Taylor Starr scattered seven hits in 6 1/3 innings and Michael Conforto and Kavin Keyes each drove in two to send 23rd-ranked Oregon State on to victory.
Starr improved to 5-2 after picking up the win. He threw 98 pitches in his second quality start of the season, allowing two walks with three strikeouts.
Conforto, meanwhile, drove in the game's first two runs as OSU scored first for the first time in the series. He singled home a run in the first then doubled home a run in the third.
Keyes highlighted OSU's three-run seventh with a two-run single to the gap in left. That was preceeded by Ryan Dunn's single up the middle off Oregon closer Jimmie Sherfy, which gave the Beavers a 3-0 lead at the time.
Conforto's two hits paced the Beavers, who improved to 9-17 this season when being out-hit as Oregon tallied eight.
The Ducks finished 42-17 overall and 19-11 in Pac-12 play.