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OSU Baseball: Former Mountain West Freshman of the Year Sean Yamaguchi Commits to Oklahoma State

Yamaguchi is also a Little League World Series champ.

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[Devin Wilber/PFB]

Josh Holliday is continuing to build next season’s roster and was able to add a talented batsman on Tuesday.

Nevada transfer Sean Yamaguchi announced his commitment to Oklahoma State. From Hawaii, Yamaguchi was the Mountain West Freshman of the Year in 2025, and through two seasons at Nevada, he hit .318 with 27 homers and 87 RBIs.

Yamaguchi played third base for the Wolf Pack this past season, where he hit slashed .310/.383/.595 with 14 home runs and 37 RBIs. He had a 10-game hit streak in the middle of the season and followed that with an eight-game hitting streak starting in mid-April. He had multiple hits in 13 of the 44 games he had an at-bat in this past season.

As a freshman in 2025, Yamaguchi hit .324 with 13 home runs, 13 doubles and 50 RBIs en route to being his conference’s freshman of the year.

Listed at 5-foot-9, 205 pounds. Yamaguchi was Hawaii’s Gatorade Player of the Year as a senior at Saint Louis High School in Honolulu. He was also a part of a Honolulu Little League team that won the 2018 Little League World Series, where he batted .400 with five RBIs.

Yamaguchi played with the Yarmouth-Dennis Red Sox in the Cape Cod League last summer, where he hit .417 in a dozen at-bats.

Yamaguchi is the seventh portal pickup the Pokes have made this offseason.

OSU’s Portal Commits

Pos. Name Former School
Infield Sean Yamaguchi Nevada
Infield Aubrey Kearns Morehead State
Pitcher Kaden Soder Utah
Pitcher Tyler Wood Wake Forest
Pitcher Ben Leikam North Greenville (D-II)
Pitcher Noah Kenney Washington
Pitcher Will Jordan Texas Tech

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