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| Given Name: | Koji |
| Birth Date: | 1975-4-3 |
| Birth City: | Neyagawa |
| Birth Country: | Japan |
| Height: | 74 cm |
| Weight: | 195 kg |
| Bats: | Right |
| Throws: | Right |
| Age: | 51 |
| Teams and Years | Batting Average | Hits | At Bats | Home Runs | Runs Batted In | Wins | Losses | Games Pitched In | Strikeouts | Shutouts | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2009 Baltimore Orioles | 0.000 | 0 | 2 | 0 | 0 | 2 | 4 | 12 | 48 | 0 | P | 0 | 1 | 5 |
| 2010 Baltimore Orioles | 0 | 0 | 0 | 0 | 1 | 2 | 43 | 55 | 0 | P | 0 | 0 | 3 | |
| 2011 Baltimore Orioles | 0 | 0 | 0 | 0 | 1 | 1 | 43 | 62 | 0 | P | 0 | 0 | 2 | |
| 2011 Texas Rangers | 0 | 0 | 0 | 0 | 1 | 2 | 22 | 23 | 0 | P | 0 | 0 | 2 | |
| 2012 Texas Rangers | 0 | 0 | 0 | 0 | 0 | 0 | 37 | 43 | 0 | P | 1 | 0 | 1 | |
| 2013 Boston Red Sox | 0 | 0 | 0 | 0 | 4 | 1 | 73 | 101 | 0 | P | 0 | 0 | 7 | |
| 2014 Boston Red Sox | 0 | 0 | 0 | 0 | 6 | 5 | 64 | 80 | 0 | P | 0 | 0 | 7 | |
| 2015 Boston Red Sox | 0 | 0 | 0 | 0 | 2 | 4 | 43 | 47 | 0 | P | 0 | 0 | 2 | |
| 2016 Boston Red Sox | 0 | 0 | 0 | 0 | 2 | 3 | 50 | 63 | 0 | P | 1 | 0 | 4 |