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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Day, Rickey | CL | Free Agent | 23 | 12/08/2011 | East Lake | USA | Left | Right | 6' 4" | 230 lbs | - |
| O'Dell, Alex | SP | Free Agent | 20 | 06/20/2014 | Wildwood | USA | Right | Right | 6' 0" | 185 lbs | - |
| O'Farrell, Chris | C | Free Agent | 24 | 02/20/2010 | Midfield | USA | Switch | Right | 6' 1" | 215 lbs | - |
| O'Fennaghty, Steve | SP | Free Agent | 20 | 02/22/2014 | Ft. Campbell North | USA | Right | Left | 6' 3" | 195 lbs | - |
| O'Keefe, William | 1B | Chicago Gold Sox | 29 | 10/06/2005 | Belvidere | USA | Left | Left | 6' 1" | 235 lbs | $3,000,000 |
| O'Rourke, Brendon | SP | Free Agent | 22 | 02/24/2012 | New York | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Toole, Joe | 2B | Free Agent | 18 | 11/18/2016 | Eau Claire | USA | Right | Right | 5' 11" | 175 lbs | - |
| O'Toole, Shane | SP | Free Agent | 18 | 08/14/2016 | Bayshore Gardens | USA | Right | Right | 6' 6" | 205 lbs | - |
| Obasanjo, Goodluck | SP | Philadelphia 1776 BC | 27 | 12/31/2007 | Calabar | NGA | Left | Right | 6' 6" | 240 lbs | $480,000 |
| Ocasio, Juan | CF | Free Agent | 21 | 09/09/2013 | Naguabo | PUR | Right | Right | 6' 0" | 190 lbs | - |
| Ogasawara, Hirohisa | SS | Chicago Gold Sox | 25 | 04/22/2009 | Yokohama | JPN | Right | Right | 6' 3" | 200 lbs | $2,200,000 |
| Ohayashi, Shigenobu | LF | Chicago Gold Sox | 25 | 06/07/2009 | Kamakura | JPN | Left | Left | 5' 10" | 185 lbs | $470,000 |
| Oja, Piotr | RP | Boston Patriots | 28 | 05/07/2006 | Roznov | CZE | Left | Left | 6' 0" | 190 lbs | $950,000 |
| Olivares, Carlos | SP | Panama City Piranhas | 20 | 11/21/2014 | San José de Matanzas | DOM | Left | Right | 5' 9" | 160 lbs | - |
| Olsen, Doug | C | Free Agent | 18 | 10/10/2016 | Metuchen | USA | Right | Right | 6' 2" | 210 lbs | - |
| Olson, Dan | C | Free Agent | 18 | 07/01/2016 | Flower Mound | USA | Right | Right | 6' 1" | 205 lbs | - |
| Olvera, Félix | RF | D.C. Divided | 17 | 10/13/2017 | Ciudad Guayana | VEN | Right | Right | 6' 3" | 195 lbs | - |
| Oroto, Daniel | C | Free Agent | 23 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 215 lbs | - |
| Ortíz, Álex | SP | D.C. Divided | 20 | 12/17/2014 | Orange Walk | BLZ | Right | Right | 6' 4" | 190 lbs | - |
| Ortíz, Pedro | RP | Las Vegas Flamingos | 36 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 220 lbs | $1,100,000 |
| Otero, Jorge | SP | Portland Evergreens | 27 | 08/06/2007 | Vado | USA | Left | Right | 6' 2" | 200 lbs | $15,000,000 |
| Otomo, Yajirobei | RP | Buckhead Bowties | 29 | 05/27/2005 | Unknown | JPN | Left | Left | 6' 8" | 235 lbs | $11,870,000 |
| Owens, Kieran | LF | Free Agent | 18 | 07/12/2016 | Cranston | USA | Right | Right | 6' 4" | 210 lbs | - |
| Owens, Walt | C | Free Agent | 22 | 12/15/2012 | Inglewood | USA | Left | Right | 6' 2" | 220 lbs | - |
