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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Leonard | 1B | Montana Pandas | 31 | 11/04/1995 | Altavista | USA | Switch | Right | 6' 0" | 225 lbs | $12,610,000 |
| Obasanjo, Goodluck | SP | Philadelphia 1776 BC | 19 | 12/31/2007 | Calabar | NGA | Left | Right | 6' 6" | 215 lbs | - |
| Ocegueda, Ramón | SP | Philadelphia 1776 BC | 20 | 09/05/2006 | Salamanca | MEX | Right | Right | 6' 2" | 180 lbs | - |
| Ohayashi, Taro | RP | Kingston Township Legion | 25 | 11/19/2001 | Kawachinagano | JPN | Right | Right | 6' 1" | 200 lbs | $280,000 |
| Oliva, Luis | C | Greenville 84s | 20 | 09/16/2006 | Santo Domingo | DOM | Right | Right | 6' 0" | 190 lbs | - |
| Omarov, Azamat | SP | Las Vegas Flamingos | 19 | 02/02/2007 | Astana | KAZ | Right | Right | 6' 1" | 170 lbs | - |
| Opalka, Milan | SP | Seattle Aviators | 19 | 11/15/2007 | Amsterdam | NED | Right | Right | 6' 0" | 175 lbs | - |
| Ornelas, Román | SP | Las Vegas Flamingos | 17 | 12/17/2009 | Ecatepec | MEX | Left | Left | 6' 1" | 180 lbs | - |
| Orozco, Jesús | 1B | Philadelphia 1776 BC | 28 | 03/11/1998 | Barinas | VEN | Right | Right | 6' 3" | 220 lbs | $5,180,000 |
| Ortíz, Emílio | CF | Free Agent | 27 | 09/05/1999 | La Romana | DOM | Right | Left | 6' 0" | 190 lbs | - |
| Ortíz, Jorge | SS | Seattle Aviators | 20 | 08/20/2006 | San Francisco de Macorís | DOM | Left | Right | 6' 2" | 175 lbs | - |
| Ortíz, José | C | Chicago Gold Sox | 16 | 01/03/2010 | San José de las Lajas | CUB | Right | Right | 6' 5" | 210 lbs | - |
| Ortíz, Reynaldo | SP | Rocky Mountain Nuggets | 26 | 09/02/2000 | Caracas | VEN | Right | Right | 5' 11" | 185 lbs | $972,000 |
| Ortíz, Sergio | 3B | Capital District Red Knights | 24 | 07/19/2002 | Izúcar | MEX | Right | Right | 6' 0" | 195 lbs | $280,000 |
| Ortíz, Vincente | CL | Portland Evergreens | 25 | 09/09/2001 | Aguada | PUR | Left | Right | 5' 10" | 190 lbs | $1,200,000 |
| Ough, Peter | SS | Greenville 84s | 19 | 07/17/2007 | Melbourne | AUS | Left | Right | 6' 1" | 180 lbs | - |
| Ouweneel, Matt | RF | Capital District Red Knights | 19 | 08/01/2007 | Sint Michiel | CUR | Left | Left | 6' 2" | 190 lbs | - |
