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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Mark | RP | Fushigi Yugi Celestial Warriors | 22 | 11/05/2017 | New York | USA | Right | Right | 6' 11" | 200 lbs | - |
| O'Halloran, Edward | RP | Free Agent | 25 | 07/31/2014 | Burke | USA | Right | Left | 6' 2" | 190 lbs | - |
| Ochoa, Wilson | C | Taipei Wardens | 18 | 02/25/2022 | Los Reyes | MEX | Right | Right | 6' 2" | 190 lbs | - |
| Ogasahara, Shoyo | SP | Free Agent | 22 | 02/11/2018 | Asahikawa | JPN | Left | Left | 6' 0" | 180 lbs | - |
| Ogawa, Shoyo | SS | Portland Chinook | 23 | 03/05/2017 | Fujinomiya | JPN | Switch | Right | 6' 2" | 185 lbs | - |
| Ogg, Kieran | SP | Long Beach Oilers | 22 | 02/19/2018 | Ayr | SCO | Right | Right | 6' 0" | 185 lbs | $510,000 |
| Oglethorpe, Jesse | 1B | Long Beach Oilers | 28 | 01/13/2012 | Dallas | USA | Right | Right | 6' 3" | 200 lbs | $510,000 |
| Ogola, Kadidu | 2B | Free Agent | 30 | 10/10/2009 | Pretoria | RSA | Left | Right | 6' 2" | 200 lbs | - |
| Ohayashi, Seitaro | RF | Kure Arsenal | 22 | 12/31/2017 | Hachioji | JPN | Left | Left | 6' 3" | 195 lbs | - |
| Ohayashi, Takao | SS | Kure Arsenal | 25 | 03/08/2015 | Hiroshima | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Ohayashi, Toyokazu | 3B | Portland Chinook | 21 | 03/17/2019 | Tokyo | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Ohayashi, Toyonobu | SP | Free Agent | 20 | 09/25/2019 | Naka | JPN | Right | Right | 6' 0" | 170 lbs | - |
| Ohayashi, Yachi | RP | Kure Arsenal | 20 | 04/17/2020 | Abiko | JPN | Right | Right | 6' 4" | 175 lbs | - |
| Oike, Noboru | SP | Tacoma Loggers | 26 | 12/02/2013 | Suzuka | JPN | Right | Right | 6' 8" | 200 lbs | $650,000 |
| Okada, Takeshi | SP | Long Beach Oilers | 19 | 11/16/2020 | Akita | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Okuta, Tsuneari | CF | Victoria Orcas | 30 | 05/14/2009 | Sakai | JPN | Switch | Right | 6' 0" | 195 lbs | $5,500,000 |
| Olivares, Héctor | SP | Fushigi Yugi Celestial Warriors | 20 | 01/18/2020 | El Limón | VEN | Right | Right | 6' 0" | 170 lbs | - |
| Olivarez, Eduardo | RP | Free Agent | 20 | 09/16/2019 | Eastchester | USA | Right | Right | 6' 9" | 200 lbs | - |
| Olson, Sam | 3B | Gwangju Jade Tigers | 29 | 02/01/2011 | Coram | USA | Switch | Right | 6' 3" | 205 lbs | $6,800,000 |
| Olvera, Felipe | SP | Free Agent | 24 | 12/01/2015 | Valladolid | ESP | Right | Right | 6' 2" | 200 lbs | - |
| Ono, Atsushi | 1B | Long Beach Oilers | 24 | 06/04/2015 | Minowa | JPN | Right | Right | 6' 4" | 200 lbs | $2,840,000 |
| Ono, Kunimatsu | RF | Portland Chinook | 20 | 03/20/2020 | Yokohama | JPN | Left | Left | 6' 4" | 195 lbs | - |
| Orozco, Francisco | C | Kure Arsenal | 23 | 04/03/2017 | San Salvador | SLV | Right | Right | 6' 1" | 200 lbs | $510,000 |
| Ortega, Pablo | RF | Portland Chinook | 30 | 05/05/2009 | Rodas | CUB | Right | Right | 6' 1" | 200 lbs | $1,240,000 |
| Ortega, Ricardo | SS | Boise Remuda | 19 | 05/05/2020 | San Juan | PUR | Switch | Right | 6' 0" | 165 lbs | - |
| Ortega, Sixto | LF | Victoria Orcas | 25 | 06/07/2014 | Holguín | CUB | Right | Right | 5' 11" | 200 lbs | $510,000 |
| Ortega, Will | 1B | Fushigi Yugi Celestial Warriors | 19 | 06/08/2020 | Loveland | USA | Right | Right | 6' 2" | 195 lbs | - |
| Ortíz, António | SS | Edo Battousai | 26 | 09/07/2013 | Las Cumbres | PAN | Right | Right | 6' 0" | 200 lbs | $800,000 |
| Ortíz, Carlos | RP | Free Agent | 28 | 09/14/2011 | Yarmouth | USA | Right | Right | 6' 4" | 200 lbs | - |
| Ortíz, Gabriel | 2B | Edo Battousai | 30 | 01/10/2010 | Candelaria | PUR | Right | Right | 6' 3" | 200 lbs | $3,800,000 |
| Ortíz, José | SP | Boise Remuda | 33 | 12/06/2006 | Havana | CUB | Right | Right | 6' 0" | 195 lbs | $3,400,000 |
| Ortíz, Juan | SP | Long Beach Oilers | 31 | 11/10/2008 | San Miguelito | PAN | Left | Right | 6' 6" | 200 lbs | $5,800,000 |
| Ortíz, Ricardo | RF | Gwangju Jade Tigers | 23 | 08/17/2016 | Cativa | PAN | Right | Right | 6' 4" | 200 lbs | - |
| Osborne, Vern | SP | Portland Chinook | 22 | 08/09/2017 | Fountain | USA | Left | Right | 6' 5" | 200 lbs | $510,000 |
| Oster, Calvin | RF | Edo Battousai | 23 | 02/23/2017 | Santa Fe | USA | Right | Right | 5' 10" | 185 lbs | - |
| Ouellette, Matthias | 3B | Boise Remuda | 37 | 01/02/2003 | Ottawa | CAN | Right | Right | 6' 2" | 200 lbs | $5,700,000 |
