From BR Bullpen
- Bats Right, Throws Right
- Height 5' 6", Weight 143 lb.
- High School PL Gakuen High School
Tsuboi played for Matsuda Auto Nagoya and Fujitetsu Nagoya in the industrial leagues after high school. Undrafted, he signed with the Chunichi Dragons in 1969. In 1970, he won the Western League batting title and went 4 for 28 with 3 walks and a homer in 18 games in 1970.
Overall, Tsuboi hit .170/.257/.214 in 197 games in NPB.