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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Neal, Joe | SP | Free Agent | 23 | 05/09/2014 | Hillcrest | USA | Left | Left | 6' 1" | 200 lbs | - |
| O'Neil, Dave | SP | Free Agent | 21 | 06/02/2016 | Canton | USA | Right | Left | 6' 1" | 195 lbs | - |
| O'Reilly, John | RP | Free Agent | 21 | 04/09/2016 | Ft. Worth | USA | Right | Right | 6' 1" | 195 lbs | - |
| O'Slattery, Eric | SP | Free Agent | 18 | 07/23/2019 | Houston | USA | Right | Right | 6' 2" | 185 lbs | - |
| O'Toole, Daniel | SP | Free Agent | 18 | 09/21/2019 | Winthrop | USA | Switch | Right | 5' 9" | 165 lbs | - |
| Ocasio, Domingo | RP | Free Agent | 23 | 08/18/2014 | San Antonio | USA | Right | Right | 6' 0" | 195 lbs | - |
| Ogawa, Torajiro | CF | Charleston Battery | 23 | 07/13/2014 | Utsunomiya | JPN | Right | Right | 6' 4" | 195 lbs | $280,000 |
| Ojgibesov, Pavpv | C | Portland Evergreens | 18 | 01/31/2019 | Krasnoyarsk | RUS | Right | Right | 6' 6" | 210 lbs | - |
| Oliver, George | C | Free Agent | 21 | 05/26/2016 | St. Charles | USA | Right | Right | 6' 1" | 205 lbs | - |
| Olthof, Gerold | C | Philadelphia 1776 BC | 26 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 215 lbs | $280,000 |
| Oroto, Daniel | C | Free Agent | 26 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 220 lbs | - |
| Orr, Ernest | 2B | Free Agent | 20 | 10/31/2017 | Fairfax | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ortega, Carlos | SP | Free Agent | 18 | 10/01/2019 | Hazard | USA | Right | Left | 6' 0" | 185 lbs | - |
| Ortíz, Bartolo | CF | D.C. Divided | 19 | 08/15/2018 | Matayaya | DOM | Right | Right | 5' 10" | 175 lbs | - |
| Ortíz, Pedro | RP | Las Vegas Flamingos | 39 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 225 lbs | $1,050,000 |
| Oshiro, Orinosuke | SP | Mississippi Mockingbirds | 18 | 11/10/2019 | Tokyo | JPN | Left | Right | 6' 9" | 215 lbs | - |
| Owen, Chris | CF | Free Agent | 21 | 03/30/2016 | Naples | USA | Right | Right | 6' 2" | 190 lbs | - |
| Owens, Dave | SP | Free Agent | 19 | 03/22/2018 | Bensalem Township | USA | Right | Right | 5' 10" | 160 lbs | - |
| Owens, Nolan | SP | Free Agent | 18 | 08/26/2019 | Elkhart | USA | Switch | Right | 6' 7" | 210 lbs | - |
| Owens, Walt | C | Free Agent | 25 | 12/15/2012 | Inglewood | USA | Left | Right | 6' 3" | 220 lbs | - |
