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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Day, Rickey | RP | Kingston Township Knights | 26 | 12/08/2011 | East Lake | USA | Left | Right | 6' 5" | 240 lbs | $280,000 |
| Obasanjo, Goodluck | RP | Free Agent | 30 | 12/31/2007 | Calabar | NGA | Left | Right | 6' 7" | 250 lbs | - |
| Ocasio, Gilberto | CF | Buffalo White Walkers | 25 | 10/29/2012 | Burbank | USA | Left | Right | 6' 2" | 190 lbs | $280,000 |
| Ohayashi, Tomokazu | C | Brooklyn Dodgers | 18 | 12/10/2019 | Arao | JPN | Right | Right | 6' 4" | 210 lbs | - |
| Oilvares, Carlos | SP | Buffalo White Walkers | 17 | 10/08/2020 | Curridabat | CRC | Right | Right | 5' 11" | 170 lbs | - |
| Oistrah, Romochka | SP | Kingston Township Knights | 19 | 08/15/2018 | Slyudyanka | RUS | Right | Left | 5' 11" | 170 lbs | - |
| Okel, Gavin | CF | Brooklyn Dodgers | 17 | 12/25/2020 | San Ignacio | BLZ | Switch | Right | 6' 3" | 175 lbs | - |
| Okumura, Josuke | SP | Hollywood Shredders | 17 | 07/05/2020 | Anjo | JPN | Right | Right | 6' 6" | 195 lbs | - |
| Oquendo, Marcos | RP | Toledo Stingers | 32 | 05/29/2005 | Matamoros | MEX | Right | Right | 6' 0" | 210 lbs | $5,600,000 |
| Orlebar, Gerald | SP | Buffalo White Walkers | 23 | 04/07/2014 | Kingston | JAM | Left | Left | 6' 2" | 200 lbs | $280,000 |
| Ornelas, Aurelio | RP | Free Agent | 32 | 11/27/2005 | La Romana | DOM | Left | Left | 6' 4" | 195 lbs | - |
| Ortega, José | 3B | Seattle Rocketeers | 24 | 05/05/2013 | Monte Plata | DOM | Right | Right | 6' 0" | 185 lbs | $280,000 |
| Ortíz, Eduardo | 3B | Echo Park Lakers | 19 | 12/02/2018 | Coacalco | MEX | Right | Right | 5' 11" | 170 lbs | - |
| Ortíz, Félix | SP | Brooklyn Dodgers | 16 | 02/09/2021 | Cumana | VEN | Left | Left | 5' 10" | 155 lbs | - |
| Ortíz, Sergio | 1B | Ft. Worth Cattlemen | 35 | 07/19/2002 | Izúcar | MEX | Right | Right | 6' 1" | 200 lbs | $1,200,000 |
| Osiman, Bungay | SP | Echo Park Lakers | 16 | 01/01/2021 | Manila | PHI | Left | Right | 6' 8" | 205 lbs | - |
| Osterman, Jon | CF | Hollywood Shredders | 30 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 190 lbs | $8,000,000 |
| Overshown, DeMarvion | RF | Panama City Piranhas | 24 | 02/24/2013 | San Antonio | USA | Left | Left | 6' 6" | 230 lbs | $280,000 |
| Ozawa, Kyuichi | SP | Kingston Township Knights | 16 | 05/10/2021 | Kashiba | JPN | Right | Right | 6' 3" | 180 lbs | - |
