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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Rob | SP | Free Agent | 18 | 09/03/2021 | Olney | USA | Switch | Right | 5' 11" | 175 lbs | - |
| O'Coleman, Billy | SP | Free Agent | 19 | 07/04/2020 | Pleasant Garden | USA | Right | Right | 6' 4" | 195 lbs | - |
| O'Donnell, Bailey | SP | Free Agent | 17 | 01/21/2022 | Gulfport | USA | Left | Left | 6' 0" | 170 lbs | - |
| O'Neal, Bernard | RP | Free Agent | 21 | 07/29/2018 | Houston | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Neal, Jim | 2B | Free Agent | 18 | 03/25/2021 | Colton | USA | Right | Right | 6' 0" | 165 lbs | - |
| O'Reilly, Andrew | SS | Free Agent | 17 | 02/23/2022 | Lancaster | USA | Left | Right | 6' 0" | 170 lbs | - |
| O'Rorke, George | SS | Portland Evergreens | 17 | 11/30/2022 | Dededo | GUM | Right | Right | 6' 4" | 180 lbs | - |
| Ocasio, Domingo | RP | Free Agent | 25 | 08/18/2014 | San Antonio | USA | Right | Right | 6' 0" | 195 lbs | - |
| Odom, Carson | SP | Free Agent | 18 | 03/08/2021 | Luna Pier | USA | Right | Right | 6' 1" | 175 lbs | - |
| Offredi, Gil | SS | Free Agent | 18 | 05/21/2021 | Rivičre-du-Loup | CAN | Right | Right | 6' 0" | 175 lbs | - |
| Oglethorpe, Jason | 1B | Free Agent | 17 | 01/11/2022 | Black Mountain | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ojima, Tobei | SP | Vancouver Grey Wolves | 18 | 08/13/2021 | Matsuyama | JPN | Left | Left | 6' 5" | 195 lbs | - |
| Oliver, David | SP | Free Agent | 17 | 01/13/2022 | El Paso | USA | Right | Right | 6' 5" | 190 lbs | - |
| Oliver, George | C | Free Agent | 23 | 05/26/2016 | St. Charles | USA | Right | Right | 6' 1" | 205 lbs | - |
| Oliwa, Ainanani | RP | Vancouver Grey Wolves | 27 | 01/23/2012 | Nuuuli | ASA | Right | Right | 5' 10" | 180 lbs | $280,000 |
| Olsen, Fred | SP | Free Agent | 21 | 12/31/2018 | Winnsboro | USA | Right | Right | 6' 4" | 210 lbs | - |
| Olthof, Gerold | C | Philadelphia 1776 BC | 28 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 215 lbs | $5,335,000 |
| Opio, Manny | 2B | Boston Patriots | 17 | 11/15/2022 | Santo Domingo | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Orlebar, Gerald | SP | Northern Virginia Rainbow Mermaids | 25 | 04/07/2014 | Kingston | JAM | Left | Left | 6' 2" | 200 lbs | $3,390,000 |
| Oroto, Daniel | C | Free Agent | 28 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 220 lbs | - |
| Orr, Ernest | 2B | Free Agent | 22 | 10/31/2017 | Fairfax | USA | Right | Right | 6' 2" | 190 lbs | - |
| Ortíz, Gabriel | 2B | New Orleans Voodoo | 17 | 04/04/2022 | Santa Teresa | VEN | Switch | Right | 6' 0" | 185 lbs | - |
| Ortíz, Miguel | RF | Free Agent | 19 | 03/03/2020 | Ponce | PUR | Left | Left | 6' 3" | 200 lbs | - |
| Ortíz, Tony | SP | Free Agent | 20 | 09/29/2019 | Philadelphia | USA | Right | Right | 6' 1" | 190 lbs | - |
| Oshima, Yoshifumi | SP | Oakland Oaks | 17 | 06/25/2022 | Kasukabe | JPN | Left | Left | 6' 4" | 180 lbs | - |
| Oskam, Hendrikjan | 1B | Oakland Oaks | 18 | 11/01/2021 | Princess Quarter | SIM | Left | Left | 6' 1" | 195 lbs | - |
| Osterman, Jon | LF | Hollywood Shredders | 32 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 195 lbs | $6,000,000 |
| Ottens, Aldo | SP | Boston Patriots | 25 | 09/07/2014 | Sint Michiel | CUR | Right | Right | 6' 3" | 190 lbs | $280,000 |
| Owens, Dave | SP | Free Agent | 21 | 03/22/2018 | Bensalem Township | USA | Right | Right | 5' 10" | 160 lbs | - |
