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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Colin | C | Oakland Oaks | 19 | 12/14/2008 | Dublin | IRL | Right | Right | 6' 1" | 185 lbs | - |
| O'Connor, Leonard | 1B | Toledo Stingers | 32 | 11/04/1995 | Altavista | USA | Switch | Right | 6' 0" | 225 lbs | $12,610,000 |
| O'Connor, Robert | RF | Vancouver Grey Wolves | 31 | 05/13/1996 | Hialeah | USA | Right | Right | 6' 0" | 230 lbs | $3,200,000 |
| Oanta, Alin | RP | Free Agent | 29 | 12/16/1998 | New York | USA | Left | Right | 6' 2" | 225 lbs | - |
| Ohara, Munemori | 2B | Northern Virginia Rainbow Mermaids | 29 | 12/16/1998 | Matsudo | JPN | Left | Right | 6' 3" | 215 lbs | $6,010,000 |
| Ohayashi, Shigenobu | CF | Chicago Gold Sox | 18 | 06/07/2009 | Kamakura | JPN | Left | Left | 5' 10" | 165 lbs | - |
| Okonjo, Idowu | SP | Portland Evergreens | 19 | 06/25/2008 | Windhoek | NAM | Right | Right | 6' 1" | 175 lbs | - |
| Oostermeer, Phil | CF | Northern Virginia Rainbow Mermaids | 18 | 02/07/2009 | Willemstad | CUR | Right | Right | 6' 2" | 175 lbs | - |
| Ornelas, Francisco | LF | Northern Virginia Rainbow Mermaids | 27 | 07/19/2000 | Santiago | DOM | Left | Left | 6' 0" | 205 lbs | $880,000 |
| Ortíz, Juan | 1B | Houston 1837 BBC | 18 | 09/21/2009 | Mexico City | MEX | Right | Right | 6' 2" | 190 lbs | - |
| Ortíz, Reynaldo | RP | Rocky Mountain Nuggets | 27 | 09/02/2000 | Caracas | VEN | Right | Right | 5' 11" | 185 lbs | $1,484,000 |
| Ortíz, Ximena | CF | Houston 1837 BBC | 18 | 08/18/2009 | Trujillo | VEN | Right | Right | 6' 1" | 180 lbs | - |
| Oulton, Everton | RF | Houston 1837 BBC | 19 | 02/23/2008 | Bradford | ENG | Right | Right | 6' 2" | 190 lbs | - |
