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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Colin | C | Oakland Oaks | 25 | 12/14/2008 | Dublin | IRL | Right | Right | 6' 1" | 195 lbs | $280,000 |
| O'Neal, Tim | CF | Oakland Oaks | 26 | 09/10/2007 | Kansas City | USA | Left | Left | 6' 3" | 220 lbs | - |
| Obregón, Gabriel | CF | Greenville 84s | 17 | 08/21/2016 | Puerto Armuelles | PAN | Left | Right | 6' 2" | 175 lbs | - |
| Ohara, Munemori | SS | Free Agent | 35 | 12/16/1998 | Matsudo | JPN | Left | Right | 6' 3" | 215 lbs | - |
| Ohayashi, Nobuhiko | CF | Kingston Township Legion | 17 | 11/06/2016 | Sakaiminato | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Ohayashi, Taro | RP | Free Agent | 32 | 11/19/2001 | Kawachinagano | JPN | Right | Right | 6' 1" | 215 lbs | - |
| Oishi, Noburo | RP | Kingston Township Legion | 27 | 08/19/2006 | Oharu | JPN | Right | Right | 6' 1" | 215 lbs | $470,000 |
| Ollerton, Corey | C | Montana Pandas | 17 | 01/01/2016 | Kingston | JAM | Right | Right | 6' 3" | 200 lbs | - |
| Olsson, Emil | RP | Houston 1837 BBC | 27 | 08/15/2006 | Kovel | UKR | Right | Right | 6' 2" | 195 lbs | $1,125,000 |
| Omori, Kazu | RP | Kingston Township Legion | 33 | 10/14/2000 | Haramachi | JPN | Left | Right | 6' 3" | 225 lbs | $9,516,375 |
| Oquendo, Marcos | RP | Wizarding Express | 28 | 05/29/2005 | Matamoros | MEX | Right | Right | 6' 0" | 200 lbs | $430,000 |
| Oram, Dylan | SS | Kingston Township Legion | 20 | 12/16/2013 | Corozal | BLZ | Right | Right | 6' 5" | 195 lbs | - |
| Ordinario, Sergio | SP | New Orleans Voodoo | 16 | 05/23/2017 | Mixco | GUA | Right | Right | 6' 4" | 185 lbs | - |
| Ornelas, Aurelio | RP | Quebec City Les Bleus | 28 | 11/27/2005 | La Romana | DOM | Left | Left | 6' 3" | 190 lbs | $280,000 |
| Orozco, Jesús | 1B | Free Agent | 35 | 03/11/1998 | Barinas | VEN | Right | Right | 6' 3" | 250 lbs | - |
| Ortíz, Francisco | SS | Echo Park Lakers | 18 | 11/25/2015 | Batan | CRC | Right | Right | 6' 1" | 170 lbs | - |
| Ortíz, Pedro | RP | Ft. Worth Cattlemen | 35 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 220 lbs | $7,000,000 |
| Osterman, Jon | LF | Houston 1837 BBC | 26 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 180 lbs | $8,200,000 |
