is a Japanese professional baseball infielder and pitcher in the Athletics organization.
Amateur career Morii attended in Kunitachi, Tokyo, where he hit 45 home runs in his high school career and recorded a top pitch speed of .
Professional career Although he was considered one of the top prospects for the 2024 NPB draft, Morii chose to forgo the draft in order to sign with a Major League Baseball organization. On January 15, 2025, Morii signed with the Athletics for a $1,510,500 signing bonus, the largest ever given by an MLB team to a Japanese amateur position player.
Morii made his pitching debut for the Single-A Stockton Ports on May 14, 2026, throwing a scoreless inning.
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