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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Rob | SP | Free Agent | 20 | 09/03/2021 | Olney | USA | Switch | Right | 5' 11" | 175 lbs | - |
| O'Bryan, Bob | SP | Free Agent | 21 | 12/26/2020 | West Orange | USA | Left | Left | 6' 4" | 215 lbs | - |
| O'Coleman, Billy | SP | Free Agent | 21 | 07/04/2020 | Pleasant Garden | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Connell, Colin | C | Buffalo White Walkers | 33 | 12/14/2008 | Dublin | IRL | Right | Right | 6' 2" | 210 lbs | $850,000 |
| O'Donnell, Jon | 2B | Free Agent | 18 | 06/05/2023 | Clearlake | USA | Right | Right | 6' 2" | 190 lbs | - |
| O'Farrell, David | SP | Free Agent | 20 | 02/04/2021 | Lutherville-Timonium | USA | Left | Left | 6' 3" | 200 lbs | - |
| O'Keefe, Harvey | SP | Free Agent | 18 | 04/15/2023 | Somerset | USA | Left | Left | 6' 4" | 195 lbs | - |
| O'Morrisey, Ray | SP | Free Agent | 18 | 10/18/2023 | Lea Hill | USA | Right | Right | 6' 1" | 180 lbs | - |
| O'Rourke, Mike | SP | Free Agent | 18 | 08/14/2023 | Tillmans Corner | USA | Left | Left | 6' 3" | 185 lbs | - |
| Ocasio, Gilberto | RF | Hollywood Shredders | 29 | 10/29/2012 | Burbank | USA | Left | Right | 6' 2" | 205 lbs | $2,700,000 |
| Ocasio, Pedro | SS | New Orleans Voodoo | 17 | 08/23/2024 | Huancayo | PER | Switch | Right | 5' 11" | 165 lbs | - |
| Ochoa, Juan | SP | Chicago Silver Sox | 19 | 09/18/2022 | Santo Domingo | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Odom, Carson | SP | Free Agent | 20 | 03/08/2021 | Luna Pier | USA | Right | Right | 6' 1" | 170 lbs | - |
| Ogawa, Torajiro | CF | Charleston Battery | 27 | 07/13/2014 | Utsunomiya | JPN | Right | Right | 6' 4" | 210 lbs | $462,000 |
| Ohm, Jae-woo | LF | Boston Patriots | 23 | 12/05/2018 | Gongju | KOR | Switch | Right | 6' 8" | 230 lbs | $280,000 |
| Olinger, Noah | SP | Free Agent | 18 | 10/02/2023 | Stockton | USA | Switch | Right | 6' 0" | 180 lbs | - |
| Olthof, Gerold | C | Free Agent | 30 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 215 lbs | - |
| Orlebar, Gerald | SP | Portland Evergreens | 27 | 04/07/2014 | Kingston | JAM | Left | Left | 6' 2" | 205 lbs | $8,390,000 |
| Ornelas, Luis | SP | Free Agent | 18 | 10/27/2023 | Corralillo | CUB | Left | Left | 6' 4" | 190 lbs | - |
| Oroto, Daniel | C | Free Agent | 30 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 230 lbs | - |
| Ortega, Salvador | C | Boston Patriots | 17 | 02/03/2024 | Santiago | DOM | Left | Right | 5' 11" | 170 lbs | - |
| Ortíz, Miguel | RF | Free Agent | 21 | 03/03/2020 | Ponce | PUR | Left | Left | 6' 3" | 200 lbs | - |
| Ortíz, Tony | SP | Free Agent | 22 | 09/29/2019 | Philadelphia | USA | Right | Right | 6' 1" | 195 lbs | - |
| Osterman, Jon | CF | Boston Patriots | 34 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 200 lbs | $3,190,000 |
| Ottens, Aldo | SP | Boston Patriots | 27 | 09/07/2014 | Sint Michiel | CUR | Right | Right | 6' 3" | 190 lbs | $280,000 |
| Oversluizen, Henk | SP | Portland Evergreens | 17 | 05/16/2024 | Willemstad | CUR | Right | Right | 6' 1" | 170 lbs | - |
| Overwater, Herman | SP | Portland Evergreens | 17 | 04/15/2024 | Willemstad | CUR | Right | Right | 6' 8" | 200 lbs | - |
| Owens, Dave | SP | Free Agent | 23 | 03/22/2018 | Bensalem Township | USA | Right | Right | 5' 10" | 165 lbs | - |
