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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Neill, Ronnie | RP | Free Agent | 35 | 09/04/2004 | Oakley | USA | Right | Right | 6' 0" | 200 lbs | - |
| Oakes, Adrian | SP | Gwinnett Stripers | 22 | 10/22/2016 | Long Beach | USA | Switch | Right | 6' 1" | 190 lbs | - |
| Ocasio, Willie | SP | Free Agent | 29 | 10/02/2010 | Baltimore | USA | Right | Right | 6' 1" | 185 lbs | - |
| Odom, Jamie | 1B | Free Agent | 27 | 10/19/2011 | Los Angeles | USA | Left | Left | 6' 4" | 200 lbs | - |
| Odom, Josh | RP | Omaha Storm Chasers | 33 | 10/03/2006 | Salamanca | USA | Right | Right | 6' 1" | 195 lbs | - |
| Okamoto, Michiyuki | RP | Toledo Mud Hens | 26 | 06/23/2013 | Osaka | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Olenick, Sean | SP | Free Agent | 31 | 04/07/2008 | New York | USA | Right | Right | 5' 11" | 185 lbs | - |
| Olivares, Jose | RP | Free Agent | 36 | 01/18/2003 | Altagracia de Orituco | VEN | Right | Right | 6' 1" | 200 lbs | - |
| Olive, Ed | SP | Free Agent | 30 | 07/01/2009 | Kent | USA | Left | Left | 6' 3" | 200 lbs | - |
| Olivo, Jose | CL | Iowa Cubs | 34 | 03/31/2005 | Seattle | USA | Right | Right | 6' 6" | 200 lbs | $2,800,000 |
| Olson, Tommy | LF | Free Agent | 31 | 09/09/2008 | Phoenix | USA | Left | Left | 6' 0" | 200 lbs | - |
| Olvera, Juan | SP | Free Agent | 29 | 10/09/2010 | Maracaibo | VEN | Left | Left | 6' 4" | 195 lbs | - |
| Oppelt, Mike | SP | Iowa Cubs | 33 | 09/29/2006 | Wauwatosa | USA | Right | Right | 6' 6" | 200 lbs | - |
| Orduna, Manny | LF | Scranton WB RailRiders | 25 | 12/26/2013 | Princeton | USA | Left | Left | 6' 4" | 200 lbs | $570,500 |
| Ornelas, Alex | LF | St. Paul Saints | 25 | 05/23/2014 | Moca | DOM | Switch | Right | 5' 11" | 185 lbs | - |
| Ortega, Alex | RF | St. Paul Saints | 30 | 08/15/2009 | Utuado | PUR | Switch | Right | 6' 4" | 200 lbs | $570,500 |
| Ortega, Rodolfo | 1B | Free Agent | 27 | 03/02/2012 | Ponce | PUR | Right | Right | 6' 3" | 200 lbs | - |
| Ortega, Victor | LF | Free Agent | 32 | 05/16/2007 | Newtown | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ortiz, Franklin | RF | Worcester Red Sox | 26 | 07/09/2013 | Hanson | USA | Right | Right | 6' 0" | 180 lbs | - |
| Ortiz, Juan | SS | Norfolk Tides | 24 | 01/01/2015 | Grand Rapids | USA | Left | Right | 6' 0" | 195 lbs | - |
| Ortiz, Manny | SP | Free Agent | 31 | 10/17/2007 | Tlalnepantla | MEX | Right | Right | 6' 8" | 200 lbs | - |
| Ortiz, Melvin | RF | Columbus Clippers | 23 | 04/02/2016 | Central Islip | USA | Left | Left | 6' 0" | 185 lbs | - |
| Ortiz, Michael | C | Omaha Storm Chasers | 26 | 09/26/2013 | San Francisco | USA | Right | Right | 6' 3" | 210 lbs | - |
| Ortiz, Mike | C | Gwinnett Stripers | 25 | 04/10/2014 | Clifton Park | USA | Left | Right | 6' 4" | 215 lbs | - |
| Ortiz, Ricky | SP | Free Agent | 30 | 06/02/2009 | Barquisimeto | VEN | Left | Left | 6' 1" | 200 lbs | - |
| Otero, Frank | SP | Free Agent | 34 | 06/07/2005 | Bucaramanga | COL | Right | Right | 6' 2" | 195 lbs | - |
| Ougel, Pat | CL | Worcester Red Sox | 31 | 03/17/2008 | Washington | USA | Right | Right | 6' 3" | 200 lbs | $3,280,000 |
| Owens, Kyle | C | Iowa Cubs | 24 | 07/11/2015 | Paterson | USA | Right | Right | 5' 11" | 200 lbs | - |
| Owens, Matt | LF | Indianapolis Indians | 23 | 08/27/2016 | Fort Wayne | USA | Right | Right | 6' 0" | 180 lbs | - |
