Andrew Moore started for the Beavers and worked 5 2/3 innings, scattering eight hits and two runs before giving way to Scotland Church in the sixth. Moore issued an uncharacteristic four walks but also struck out five to get the win and improve to 6-2 on the year.
Harrison opened the game’s scoring with a single, then watched as Caleb Hamilton drove in a run on a single in the second.
OSU (34-14-1 overall, 15-9-1 Pac-12) saw that lead expand to five with three runs in the fifth. Harrison hit the first pitch of the inning over the fence in left center. It was his 10th home run of the year and third in his last two games.
Harrison, who leads the Pac-12 in RBIs, is now tied for second in the Pac-12 in homers behind Arizona's Bobby Dalbec (14).
Gretler made it 5-0, when, with the bases loaded, he scorched a single to left, enabling two runs to score.
The Cardinal put two on the board in the bottom half of the fifth to pull to within three but OSU shut Stanford down from there.
Brett Hanewich started for the Cardinal (22-29, 7-18) and lasted just 4 1/3 innings before giving way to reliever Tyler Thorne with the bases loaded in the fifth. Thorne’s first batter, Gretler, singled to left, which closed the book on Hanewich, who allowed six hits and five runs. He walked seven and took the loss to drop to 3-6 on the year.
Scotland Church and Luke Heimlich combined for 3 1/3 innings of relief. Heimlich picked up his fourth save of the season.
Harrison and Christian Donahue’s each had two hits to pace the Beavers.
Oregon State and Stanford combined for 16 walks and 25 batters left on base.
The teams continue the series Saturday night in a 7:05 p.m. PT first pitch from Sunken Diamond.
The game will be televised live on the Pac-12 Networks.
BASEBALL: Beavs stay hot with another win
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