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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Ibáñez, David | MR | Free Agent | 29 | 12/06/1985 | Carolina | PUR | Right | Right | 6' 5" | 212 lbs | - |
| Ibarra, Héctor | MR | Free Agent | 30 | 04/08/1984 | Brandon | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ichikawa, Tetsuo | RF | Kingwood Knights | 36 | 02/08/1978 | Hachinohe | JPN | Right | Right | 6' 5" | 205 lbs | - |
| Iida, Shojiro | 1B | Las Vegas Lost | 23 | 11/12/1991 | Omihachiman | JPN | Right | Right | 5' 10" | 175 lbs | - |
| Iivonen, Kimmo | CF | Free Agent | 26 | 10/07/1988 | Manhattan | USA | Right | Right | 6' 2" | 195 lbs | - |
| Ikeda, Yosai | MR | Free Agent | 34 | 10/12/1980 | Ichikawa | JPN | Right | Right | 5' 10" | 212 lbs | - |
| Imai, Kuniaki | MR | Barrow Frosties | 19 | 06/10/1995 | Koriyama | JPN | Right | Right | 6' 2" | 190 lbs | $500,000 |
| Ine, Shojiro | C | St. Paul Saints | 18 | 08/14/1996 | Toyota | JPN | Switch | Right | 5' 10" | 205 lbs | - |
| Inman, Jeff | MR | Free Agent | 25 | 03/28/1989 | Kennesaw | USA | Right | Right | 6' 0" | 210 lbs | - |
| Inoue, Kyoichi | 1B | Dearborn Pioneers | 20 | 06/19/1994 | Asaba | JPN | Switch | Right | 6' 4" | 210 lbs | - |
| Inoue, Yoshihide | CF | Palm Beach Bums | 23 | 07/17/1991 | Fujisawa | JPN | Switch | Right | 6' 2" | 205 lbs | - |
| Irwin, Jon | 2B | Free Agent | 25 | 05/02/1989 | Corona | USA | Right | Right | 5' 6" | 195 lbs | - |
| Ise, Senichi | MR | Free Agent | 38 | 05/24/1976 | Kashiwa | JPN | Right | Right | 6' 0" | 215 lbs | - |
| Ishida, Mokichi | MR | Roman Fascists | 24 | 03/15/1990 | Hitachi | JPN | Left | Left | 6' 2" | 219 lbs | - |
| Ishii, Naomi | MR | Nichols Gnats | 21 | 03/26/1993 | Kyoto | JPN | Switch | Right | 6' 7" | 215 lbs | - |
| Ishikawa, Izumo | SP | Roman Fascists | 32 | 02/22/1982 | Takahagi | JPN | Right | Right | 5' 11" | 215 lbs | - |
| Ising, Seb | MR | Baltimore Blue Claws | 17 | 07/27/1997 | Launceston | AUS | Right | Right | 5' 11" | 210 lbs | - |
| Ito, Hisashi | LF | Free Agent | 19 | 11/08/1995 | Hino | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Ito, Kenzaburo | SS | Free Agent | 34 | 04/22/1980 | Hekinan | JPN | Switch | Right | 6' 4" | 196 lbs | - |
| Ito, Masahiro | LF | Penzance Pirates | 35 | 11/26/1979 | Toki | JPN | Right | Right | 6' 2" | 193 lbs | - |
| Ito, Osamu | LF | Nichols Gnats | 20 | 12/19/1994 | Yokohama | JPN | Left | Left | 5' 11" | 185 lbs | - |
| Ito, Yoritomo | MR | Kingwood Knights | 33 | 08/16/1981 | Abiko | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Ives, Ken | MR | Nichols Gnats | 19 | 12/27/1995 | White Rock | CAN | Left | Right | 5' 9" | 225 lbs | - |
