Caleb Gilbert held No. 1 national seed Oregon State to two hits in 7 1/3 innings, Michael Papierski homered from both sides of the plate and LSU beat the Beavers 6-1 on Saturday to reach the College World Series finals.
The Tigers (52-18) won their third straight elimination game, including back-to-back victories over Oregon State. The Beavers (56-6) had a pair of 23-game winning streaks and finished the season with a .903 winning percentage - the best since Texas' mark of .908 in 1982.
The Tigers beat the Beavers 3-1 on Friday to force the second game.
Gilbert allowed an infield single and walk before Michael Gretler homered in the seventh. He struck out a career-high seven in his longest outing in his two seasons at LSU. Zack Hess allowed one hit the rest of the way.
Papierski became the first player to homer twice in a CWS game since TCU's Bryan Holaday in 2010. He went deep from the left side off Bryce Fehmel in the second and the right side off Brandon Eisert in the fourth.