|Tohoku Rakuten Golden Eagles – No. 1|
|Born:October 30, 1995|
|Bats: Left||Throws: Left|
As a pitcher for Toko Gakuen high school, he won a 7-0 victory against Imabari-Nishi high school where he racked up 22 strikeouts. Later on, he struck out 19 batters at Koshien Stadium and won a 7-5 game over Joso Gakuin. He also struck out the same amount in 2005, which ranked him along with Yoshinori Toda in 1963.
In October 2013, he was selected by five teams in the professional draft, with the Tohoku Rakuten Golden Eagles winning the rights to negotiate with him. On April 2, 2014 his team scored 7-1 against Orix Buffaloes even though he made only three runs.
Matsui is a 5 feet 9 inches (1.75 m), 165 pounds (75 kg) left-handed pitcher. With an overhand delivery he throws a high-80s fastball (tops out at 93 mph), a change-up, an occasional curveball, and a solid slider around 80 mph, which is his best pitch. He mostly uses his fastball-slider combination in games.
- "Baseball: Japanese teen pitcher strikes out 22 in one game". Chicago Tribune. August 10, 2012. Archived from the original on April 8, 2014. Retrieved November 6, 2013.
- "Record-breaking Matsui strikes out 19 more". The Japan Times. August 17, 2012. Archived from the original on April 8, 2014. Retrieved November 6, 2013.
- "Eagles win rights to coveted lefty Matsui". Japan Times. 24 October 2013. Archived from the original on February 25, 2014. Retrieved 17 November 17, 2013.
- "Eagles rookie Matsui shelled in debut". Japan Times. April 2, 2014. Retrieved June 22, 2014.
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