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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Loughlin, Jack | SP | Wisconsin Timber Rattlers | 28 | 03/14/2000 | Adelaide | AUS | Left | Left | 6' 5" | 205 lbs | - |
| Ogando, Luis | 2B | Wisconsin Timber Rattlers | 24 | 10/11/2003 | Santo Domingo | DOM | Right | Right | 5' 10" | 180 lbs | - |
| Olds, Wyatt | RP | Quad Cities River Bandits | 28 | 08/05/1999 | Newalla | USA | Right | Right | 6' 1" | 195 lbs | - |
| Olivera, Brandon | SP | Great Lakes Loons | 23 | 05/04/2005 | Hialeah | USA | Right | Right | 6' 1" | 195 lbs | - |
| Ollarve, Jason | C | Quad Cities River Bandits | 24 | 05/20/2004 | Maracaibo | VEN | Left | Right | 5' 10" | 180 lbs | $720,000 |
| Ortega, Oliver | RP | Free Agent | 31 | 10/02/1996 | Nagua | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Ortega, Wilmer | SP | Free Agent | 27 | 04/04/2001 | San Felipe | VEN | Right | Right | 6' 1" | 190 lbs | - |
| Osborn, Drake | C | Free Agent | 29 | 07/22/1998 | Sandia | USA | Right | Right | 5' 11" | 200 lbs | - |
| Ossenfort, Matthew | 1B | Peoria Chiefs | 24 | 03/16/2004 | Sioux Falls | USA | Left | Left | 6' 4" | 215 lbs | - |
| Oviedo, Juan | C | West Michigan Whitecaps | 24 | 01/30/2004 | Barquisimeto | VEN | Right | Right | 5' 10" | 175 lbs | - |
| Owens, Clay | C | Reno Gamblers | 29 | 03/13/1999 | Corona | USA | Left | Right | 6' 0" | 200 lbs | - |
