Kobayashi with the Yomiuri Giants
|Yomiuri Giants – No. 22|
|Born:June 7, 1989|
|March 24, 2014, for the Yomiuri Giants|
|Career highlights and awards|
Kobayashi attended Doshisha University, where he played for the school's baseball team. The Yomiuri Giants selected Kobayashi in the 2013 NPB Draft. Kobayashi was added to the Japanese baseball team's roster for the 2014 Major League Baseball Japan All-Star Series.
- Doshisha Graduate Seiji KOBAYASHI Picked in the Giant’s Fist-round Draft! | Spotlights AY2013 | Doshisha University
- "マイナビオールスターゲーム2018 ファン投票結果". NPB.jp 日本野球機構 (in Japanese). June 26, 2018. Retrieved June 25, 2018.
- Career statistics and player information from Baseball-Reference (Minors)