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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brian, Rory | 3B | Rosarito Monjas del Vuelo | 22 | 06/28/2020 | Fort Worth | USA | Right | Right | 6' 1" | 175 lbs | - |
| O'Brian, Terry | RP | Cheyenne Frontier | 22 | 02/06/2020 | Dryden | USA | Right | Left | 6' 1" | 185 lbs | - |
| O'Brien, Paul | SP | Kingston Suns | 23 | 09/23/2019 | Corpus Christi | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Day, Ronald | SP | Utrecht Scholars | 25 | 08/25/2017 | San Juan | PUR | Switch | Right | 6' 7" | 200 lbs | - |
| O'Keefe, Willie | RP | Nampa Moccasins | 23 | 07/23/2019 | Vancouver | CAN | Switch | Right | 6' 2" | 185 lbs | - |
| O'Neal, Mitch | RF | Middle Bass Vintners | 22 | 05/31/2020 | Vallejo | USA | Left | Right | 6' 1" | 185 lbs | - |
| O'Quinn, Mike | CL | Portsmouth Dockhands | 23 | 02/15/2019 | Brooklyn | USA | Switch | Right | 6' 1" | 185 lbs | - |
| Oake, Jim | C | Drumright Tornadoes | 22 | 03/03/2020 | Toronto | CAN | Right | Right | 6' 2" | 190 lbs | - |
| Ocasio, Luis | SP | Nassau Vulcans | 21 | 11/03/2020 | Havana | CUB | Right | Right | 6' 6" | 200 lbs | - |
| Ochoa, Andrés | SP | Alexandria Macedonians | 19 | 08/22/2023 | Santiago de Cuba | CUB | Left | Left | 6' 4" | 185 lbs | - |
| Ohayashi, Yoshimi | 2B | Calexico Reins | 21 | 11/12/2020 | Kunitachi | JPN | Switch | Right | 6' 4" | 200 lbs | - |
| Okabe, Kuniaki | SP | Escondido Stone Brews | 23 | 09/12/2019 | Iida | JPN | Right | Right | 6' 4" | 195 lbs | - |
| Okada, Seiji | RF | Rosarito Monjas del Vuelo | 22 | 09/21/2020 | Nagoya | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Okada, Suezo | SP | Middle Bass Vintners | 21 | 01/14/2021 | Okayama | JPN | Switch | Right | 6' 4" | 185 lbs | - |
| Okamoto, Shotaro | CF | Middle Bass Vintners | 22 | 08/01/2020 | Fukuoka | JPN | Right | Right | 6' 1" | 175 lbs | - |
| Okamura, Takafumi | 3B | Free Agent | 26 | 09/07/2016 | Hitoyoshi | JPN | Left | Right | 6' 2" | 195 lbs | - |
| Okubo, Sekien | 2B | Free Agent | 26 | 03/18/2016 | Hiratsuka | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Okubo, Shunen | SP | Rapid City Rushmores | 25 | 09/17/2017 | Yatsushiro | JPN | Left | Left | 6' 4" | 200 lbs | - |
| Okumura, Tokutomi | RP | Takaoka Shiko | 21 | 05/29/2021 | Shizuoka | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Okuta, Yoshitaka | RP | Calexico Reins | 22 | 02/13/2020 | Seki | JPN | Left | Left | 6' 4" | 200 lbs | - |
| Olivarez, Carlos | LF | Calexico Reins | 25 | 09/29/2017 | Contramaestre | CUB | Left | Left | 6' 1" | 200 lbs | - |
| Oliveira, Juan | SS | Utrecht Scholars | 21 | 11/07/2020 | Cataño | PUR | Left | Right | 6' 0" | 175 lbs | - |
| Oliver, Porter | RP | San Luis Rio Colorado Rapidos Blancos | 21 | 07/02/2021 | Gresham | USA | Switch | Right | 5' 11" | 165 lbs | - |
| Ong, Ai-de | 1B | Free Agent | 25 | 07/29/2017 | Shanghai | CHN | Right | Right | 6' 5" | 200 lbs | - |
| Ong, Hyun-il | RP | Free Agent | 25 | 12/27/2016 | Seoul | KOR | Right | Right | 6' 8" | 200 lbs | - |
| Onishi, Tetsuzan | RP | Nagano Olympians | 22 | 05/08/2020 | Tosashimizu | JPN | Right | Right | 6' 6" | 200 lbs | - |
| Ordóñez, Pancho | RP | Rapid City Rushmores | 25 | 07/23/2017 | San Felipe | CRC | Right | Right | 6' 4" | 195 lbs | - |
| Orozco, Juan Carlos | SS | Bismarck Battleships | 25 | 08/31/2017 | Tualatin | USA | Left | Right | 6' 3" | 195 lbs | - |
| Ortega, Raúl | CF | Free Agent | 27 | 10/16/2015 | Santo Domingo | DOM | Left | Left | 6' 2" | 200 lbs | - |
| Ortíz, Cristián | RP | Hoboken Crooners | 21 | 05/04/2021 | Riverside | USA | Right | Right | 6' 4" | 185 lbs | - |
| Ortíz, Gerardo | SP | Magami Ako | 21 | 01/20/2021 | Coahuayana | MEX | Right | Right | 6' 2" | 190 lbs | - |
| Ortíz, Iván | 2B | Escondido Stone Brews | 22 | 07/13/2020 | Punta Cardón | VEN | Right | Right | 6' 4" | 200 lbs | - |
| Ortíz, Jorge | 2B | Drumright Tornadoes | 21 | 11/06/2020 | Leonia | USA | Right | Right | 6' 6" | 195 lbs | - |
| Ortíz, Norberto | 2B | Middle Bass Vintners | 24 | 03/07/2018 | Villa Bisonó | DOM | Right | Right | 5' 10" | 170 lbs | - |
| Osorto, Guillermo | SP | Fort Wayne Pioneers | 21 | 01/08/2021 | Santo Domingo | DOM | Right | Right | 6' 4" | 195 lbs | - |
| Otano, Miguel | SP | Nagano Olympians | 22 | 07/25/2020 | Valle de Bravo | MEX | Left | Left | 6' 7" | 200 lbs | - |
| Otsuka, Yataro | 3B | Nassau Vulcans | 23 | 10/14/2019 | Nitta | JPN | Right | Right | 6' 0" | 195 lbs | - |
