Player Directory
Tohoku Rakuten Golden Eagles
Kosei Koga
Kosei Koga
61
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ERA
ERA---
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strike out rate
K/9---
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BB rate
BB/9---
*FY2026
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position
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birthday
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age
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height
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body weight
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Birthplace
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Pitching and batting
left-handed pitcher / left-handed hitter
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Blood type
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Draft Year
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Biography
Shimonoseki Kokusai High School ~ 2023 Rakuten Eagles Dragons Development Player ②
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Titles won
Videos
![[Farm Team] The Eagles 'Kosei Koga strike out 9 batters in 5 innings with no runs, aiming for a spot on the opening day roster!! March 17, 2026 Chiba Lotte Marines vs. Tohoku Rakuten Golden Eagles](https://images.streaks.jp/plm/medias/b0b3ea1bfe4940dc89cde938648d8f95/posters/b19fbd9a-9a92-4a01-baa4-d65bb50ac888.jpg)
![[Farm Team] The Eagles 'Kosei Koga makes a strong impression with a spectacular pitch, striking out three struck out in a row!! March 17, 2026 Chiba Lotte Marines vs. Tohoku Rakuten Golden Eagles](https://images.streaks.jp/plm/medias/f190c729281e45d7a0341be54319ae56/posters/6ac47c04-ace4-4b1e-b259-18d6520ae9fc.jpg)
Participation results
No data
article
![Farm] Tohoku Rakuten Eagles wins a close game Yoshiaki Watanabe hits first & Kosei Koga 1 in the middle of the 8th inning runs](https://media.insight.pacificleague.com/webp/5pR3DfvQQmrQZgr7CxE0PgX8PO0NyXUWSABF5aNi.webp)
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![[Miyazaki PL] 16 hit Inuwashi great win with 11 goals Kosei Koga is 6 in 7 hit 2 runs (earned runs 1)](https://media.insight.pacificleague.com/Tf9PKM0EgdJcQxqmJz07hoFHUQibtNyuoCELsdB7.jpg)
[Miyazaki PL] 16 hit Inuwashi great win with 11 goals Kosei Koga is 6 in 7 hit 2 runs (earned runs 1)
Pacific League Insight
2025.10.19(日) 16:01
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![[Farm] Kosei Koga pitches no runs through the eighth inning as Tohoku Rakuten stops its losing streak](https://media.insight.pacificleague.com/webp/D7vlGGvRiG9CK7NEJpvXnTXnUuWRqm09DEw94xnC.webp)
[Farm] Kosei Koga pitches no runs through the eighth inning as Tohoku Rakuten stops its losing streak
Pacific League Insight
2025.9.11(木) 15:18
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![[Farm] Kosei Koga pitched well, allowing 6 hit 2 runs in 8.2 innings! Tohoku Rakuten win](https://media.insight.pacificleague.com/webp/cFGq5Ttq7rGy6bK9zJ5mlG3k0NWwUTROKzpmblcd.webp)
[Farm] Kosei Koga pitched well, allowing 6 hit 2 runs in 8.2 innings! Tohoku Rakuten win
Pacific League Insight
2025.8.9(土) 16:03
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