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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Jin-hyun | RP | Laval Islanders | 26 | 01/08/2016 | Hoechon | KOR | Right | Right | 5' 11" | 190 lbs | - |
| O'Brien, David | SS | Rockville Reckoning | 26 | 06/09/2016 | Lauderdale Lakes | USA | Left | Right | 6' 2" | 200 lbs | - |
| O'Halloran, Mike | RP | Seoul Crushers | 27 | 09/12/2015 | West Little River | USA | Right | Right | 5' 10" | 185 lbs | $900,000 |
| O'Kernaghan, Ed | C | Free Agent | 23 | 04/12/2019 | Benavides | USA | Right | Right | 6' 1" | 195 lbs | - |
| O'Quinn, Dave | CF | Camden Consigliere | 22 | 08/17/2020 | Honolulu | USA | Left | Right | 6' 2" | 180 lbs | - |
| O'Quinn, Willie | 1B | Medicine Hat Drillers | 26 | 11/18/2015 | Waukesha | USA | Left | Right | 6' 6" | 220 lbs | - |
| Ogawa, Anzai | LF | Gatineau Balloonists | 27 | 10/08/2015 | Tokyo | JPN | Left | Left | 6' 3" | 200 lbs | - |
| Ohara, Atsushi | 2B | Narragansett Seagulls | 25 | 08/17/2017 | Tokyo | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Ohara, Kenzo | LF | Toyohira Fubuki | 22 | 05/28/2020 | Tokyo | JPN | Left | Right | 5' 11" | 175 lbs | - |
| Ohayashi, Kosami | SP | Sherwood Park Hoods | 24 | 06/19/2018 | Takarazuka | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Oike, Naofumi | SS | Santurce Castillos | 25 | 12/03/2016 | Osaka | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Oishi, Sugita | RP | Narragansett Seagulls | 24 | 03/11/2018 | Matsuyama | JPN | Right | Right | 6' 5" | 205 lbs | - |
| Ojeda, Carlos | SS | Beaufort Loggerdoggers | 22 | 07/04/2020 | Ovalle | CHI | Right | Right | 6' 3" | 190 lbs | - |
| Ojima, Kosaku | RP | Lodoss Spell Swords | 22 | 05/27/2020 | Tokorozawa | JPN | Right | Right | 6' 2" | 180 lbs | - |
| Okada, Hogai | 1B | Lodoss Spell Swords | 21 | 11/18/2020 | Inagi | JPN | Left | Left | 6' 2" | 195 lbs | - |
| Okada, Shojiro | LF | Quebec City Frenchies | 26 | 07/10/2016 | Sendai | JPN | Switch | Right | 6' 0" | 200 lbs | - |
| Okamoto, Naofumi | RP | Beaufort Loggerdoggers | 26 | 05/26/2016 | Matsudo | JPN | Left | Left | 6' 4" | 190 lbs | - |
| Okamura, Sachi | SP | Liverpool Beatles | 23 | 04/17/2019 | Kobe | JPN | Right | Right | 6' 6" | 205 lbs | - |
| Okamura, Sadaharu | 1B | Narragansett Seagulls | 27 | 06/01/2015 | Nagoya | JPN | Right | Right | 6' 1" | 200 lbs | $560,000 |
| Okazaki, Hidemichi | SP | Monterey Sea Lions | 21 | 11/04/2020 | Tokyo | JPN | Left | Right | 6' 1" | 180 lbs | - |
| Okazaki, Takeji | 1B | Sherwood Park Hoods | 25 | 10/13/2017 | Tachikawa | JPN | Left | Right | 6' 4" | 200 lbs | - |
| Olivo, Marcos | RP | Kumamoto Mothra | 26 | 10/04/2016 | León | NCA | Right | Right | 6' 6" | 210 lbs | - |
| Ong, Hang-fu | RP | Ikari Warriors | 22 | 01/21/2020 | Taichung | TPE | Right | Right | 6' 2" | 195 lbs | - |
| Ono, Namboku | RP | Rockville Reckoning | 22 | 02/07/2020 | Tokyo | JPN | Right | Left | 6' 1" | 170 lbs | - |
| Opie, Jack | RF | Brampton Camels | 23 | 04/28/2019 | Eston and South Bank | ENG | Left | Left | 6' 0" | 175 lbs | - |
| Ordóñez, José | SS | Rockville Reckoning | 27 | 11/09/2014 | Aguadilla | PUR | Right | Right | 6' 0" | 190 lbs | $1,848,600 |
| Orr, Don | LF | Free Agent | 30 | 11/01/2011 | Staten Island | USA | Right | Right | 6' 0" | 200 lbs | - |
| Orr, Will | RP | Toyohira Fubuki | 23 | 04/14/2019 | Sterling | USA | Left | Left | 6' 7" | 205 lbs | - |
| Ortega, Luis | RP | Narragansett Seagulls | 22 | 11/17/2019 | Puerto Plata | DOM | Left | Right | 5' 10" | 170 lbs | - |
| Ortega, Miguel | LF | Free Agent | 25 | 02/28/2017 | Cienfuegos | CUB | Left | Left | 6' 6" | 200 lbs | - |
| Ortega, Pepe | LF | Port-au-Prince Bokors | 22 | 12/13/2019 | San Miguel Dueñas | GUA | Right | Right | 6' 4" | 200 lbs | - |
| Ortíz, Esteban | RP | Free Agent | 25 | 03/26/2017 | Managua | NCA | Left | Right | 6' 2" | 190 lbs | - |
| Ortíz, Francisco | SP | Edmonton Mall Ratz | 20 | 11/18/2021 | San Rafael | CRC | Right | Right | 6' 3" | 200 lbs | - |
| Ortíz, Octávio | SP | Gatineau Balloonists | 25 | 05/30/2017 | Santo Domingo | DOM | Right | Right | 6' 0" | 185 lbs | - |
| Ortíz, Raúl | C | Free Agent | 30 | 04/14/2012 | Consuelo | DOM | Right | Right | 6' 5" | 200 lbs | - |
| Osborne, Ian | 3B | Hamilton Industrialists | 25 | 09/11/2017 | Brisbane | AUS | Right | Right | 6' 0" | 195 lbs | - |
| Oshima, Okakura | LF | Free Agent | 27 | 06/27/2015 | Toyota | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Overwater, Klaus | LF | Santurce Castillos | 23 | 10/14/2019 | Laarbeek | NED | Right | Left | 6' 4" | 200 lbs | - |
| Ow, Zhuo-cheng | RP | Inverness Highlanders | 25 | 12/09/2016 | Fengyuan | TPE | Right | Right | 6' 3" | 195 lbs | - |
