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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brian, Pat | 2B | Nashville Sounds | 30 | 03/20/2012 | St. Petersburg | USA | Right | Right | 6' 0" | 200 lbs | - |
| O'Bryant, Jeremy | SP | Indianapolis Indians | 30 | 12/01/2011 | Bellefontaine Neighbors | USA | Left | Right | 6' 0" | 200 lbs | - |
| O'Dennehy, Sean | 1B | Gwinnett Stripers | 30 | 02/11/2012 | Phoenix | USA | Right | Right | 5' 9" | 195 lbs | - |
| O'Grotty, Rob | RP | Gwinnett Stripers | 28 | 08/25/2013 | Sachse | USA | Right | Right | 6' 3" | 205 lbs | - |
| O'Talharan, Stu | RP | Indianapolis Indians | 34 | 06/22/2007 | Deming | USA | Right | Right | 6' 3" | 200 lbs | - |
| Offen, Dan | 3B | Jacksonville Jumbo Shrimp | 24 | 07/07/2017 | Tipton | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ojeda, Rodrigo | C | Columbus Clippers | 25 | 11/30/2016 | Duvergé | DOM | Right | Right | 6' 3" | 200 lbs | $750,000 |
| Olson, Ron | RP | Worcester Red Sox | 25 | 11/10/2016 | Shenandoah | USA | Right | Right | 6' 2" | 190 lbs | $750,000 |
| Ondruj, Norman | RP | Free Agent | 28 | 10/17/2013 | Brooklyn | USA | Left | Left | 6' 3" | 200 lbs | - |
| Ortíz, António | 2B | St. Paul Saints | 23 | 08/01/2018 | Maracaibo | VEN | Right | Right | 6' 0" | 185 lbs | - |
| Ortíz, César | 3B | Syracuse Chiefs | 26 | 10/19/2015 | Mérida | VEN | Right | Right | 6' 1" | 200 lbs | $950,000 |
| Ortíz, Juan | C | Nashville Sounds | 36 | 11/23/2005 | Porlamar | VEN | Right | Right | 6' 1" | 205 lbs | $750,000 |
| Owen, Johnny | 2B | Indianapolis Indians | 35 | 05/01/2007 | Calgary | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Owens, Joe | C | Free Agent | 28 | 09/28/2013 | Los Angeles | USA | Right | Right | 6' 0" | 200 lbs | - |
