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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Collins, Gerald | SS | Free Agent | 22 | 09/30/2006 | Opelika | USA | Right | Right | 5' 11" | 185 lbs | - |
| O'Connor, Leonard | 1B | Free Agent | 33 | 11/04/1995 | Altavista | USA | Switch | Right | 6' 0" | 230 lbs | - |
| Oerlemans, Hildo | CF | Greenville 84s | 18 | 11/20/2010 | Willemstad | CUR | Right | Right | 6' 0" | 180 lbs | - |
| Ohayashi, Taro | RP | Kingston Township Legion | 27 | 11/19/2001 | Kawachinagano | JPN | Right | Right | 6' 1" | 200 lbs | $470,000 |
| Olsson, Emil | SP | Houston 1837 BBC | 22 | 08/15/2006 | Kovel | UKR | Right | Right | 6' 2" | 180 lbs | $280,000 |
| Olthof, Gerold | C | Philadelphia 1776 BC | 17 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 195 lbs | - |
| Ornelas, Román | SP | Las Vegas Flamingos | 19 | 12/17/2009 | Ecatepec | MEX | Left | Left | 6' 1" | 185 lbs | - |
| Orozco, Jesús | 1B | Philadelphia 1776 BC | 30 | 03/11/1998 | Barinas | VEN | Right | Right | 6' 3" | 235 lbs | $5,180,000 |
| Ortega, António | SS | Houston 1837 BBC | 18 | 09/08/2010 | La Ceiba | HON | Right | Right | 6' 0" | 170 lbs | - |
| Ortega, José | RF | Free Agent | 27 | 06/29/2001 | Arraijan | PAN | Left | Left | 6' 2" | 200 lbs | - |
| Ortega, Ramón | RP | Free Agent | 39 | 05/04/1989 | Santo Domingo | DOM | Right | Right | 6' 2" | 245 lbs | - |
| Ortíz, José | C | Chicago Gold Sox | 18 | 01/03/2010 | San José de las Lajas | CUB | Right | Right | 6' 5" | 210 lbs | - |
| Ortíz, Pedro | SS | Philadelphia 1776 BC | 16 | 04/29/2012 | Trinidad | CRC | Right | Right | 6' 0" | 160 lbs | - |
| Ortíz, Pedro | SP | Buckhead Bowties | 30 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 210 lbs | $2,050,000 |
| Ortíz, Roberto | CF | Kingston Township Legion | 17 | 11/24/2011 | Puerto Plata | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Ortíz, Sergio | 3B | Capital District Red Knights | 26 | 07/19/2002 | Izúcar | MEX | Right | Right | 6' 0" | 200 lbs | $5,000,000 |
| Osterman, Jon | CF | New Amsterdam Dutchmen | 21 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 165 lbs | $280,000 |
| Otani, Shohei | 1B | Greenville 84s | 17 | 01/16/2011 | Iwate | JPN | Left | Left | 5' 11" | 185 lbs | - |
| Öunap, Reino | SP | Kingston Township Legion | 18 | 04/23/2010 | Tatabanya | HUN | Left | Left | 6' 2" | 175 lbs | - |
| Overbeek, Marvin | SS | Chicago Gold Sox | 18 | 05/13/2010 | Tera Cora | CUR | Right | Right | 6' 0" | 175 lbs | - |
| Overhill, Kyle | SP | Greenville 84s | 18 | 09/18/2010 | May Pen | JAM | Switch | Right | 6' 1" | 180 lbs | - |
