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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Mike | 3B | Free Agent | 30 | 08/04/1991 | Wheaton | USA | Right | Right | 6' 4" | 245 lbs | - |
| O'Neill, Eric | CF | Helena Grizzlies | 24 | 05/04/1997 | Bridgeport | USA | Switch | Right | 5' 10" | 185 lbs | - |
| O'Quinlevan, Dustin | CF | Helena Grizzlies | 22 | 07/05/1999 | Montegut | USA | Right | Right | 5' 10" | 175 lbs | - |
| O'Sullivan, Dale | SS | San Bernardino Grasshoppers | 22 | 09/21/1999 | North Seekonk | USA | Right | Right | 5' 11" | 165 lbs | - |
| O'Toole, Chris | RP | Irving Blue Sox | 24 | 11/08/1997 | Memphis | USA | Left | Left | 5' 10" | 185 lbs | - |
| Ohayashi, Taro | RP | Helena Grizzlies | 20 | 11/19/2001 | Kawachinagano | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Oliva, Luis | RP | Glendale Herons | 23 | 09/11/1998 | Salcedo | DOM | Left | Right | 6' 3" | 190 lbs | - |
| Olivares, Brian | 1B | Westwood Sixshooters | 30 | 12/11/1991 | Shoreline | USA | Right | Right | 6' 2" | 250 lbs | - |
| Ormston, Steve | C | Free Agent | 29 | 04/20/1992 | New York | USA | Right | Right | 6' 0" | 255 lbs | - |
| Ortega, Juan | SS | Chesapeake Continentals | 21 | 08/15/2000 | La Vega | DOM | Switch | Right | 6' 2" | 195 lbs | - |
| Ortega, Leonardo | C | Athletic Club KC Academy | 22 | 05/05/1999 | Glen Burnie | USA | Right | Right | 6' 3" | 215 lbs | - |
| Ortíz, Sergio | 3B | San Bernardino Grasshoppers | 19 | 07/19/2002 | Izúcar | MEX | Right | Right | 6' 0" | 185 lbs | - |
| Oyan, Doruk | SP | Helena Grizzlies | 25 | 02/21/1996 | San Pablo | USA | Right | Right | 6' 3" | 215 lbs | - |
