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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Dave | 1B | Philadelphia Hornets | 28 | 01/24/2008 | Camarillo | USA | Right | Right | 6' 4" | 235 lbs | $3,146,000 |
| O'Toole, Clinton | RP | Chicago Reapers | 24 | 02/10/2012 | Chicago | USA | Right | Right | 6' 2" | 180 lbs | $300,000 |
| Offredi, Ed | SP | Appalachian Black Bears | 19 | 11/19/2016 | Edmonton | CAN | Right | Right | 6' 3" | 190 lbs | - |
| Ogawa, Yasuhiko | SP | Brooklyn Wolves | 18 | 08/10/2018 | Tokyo | JPN | Right | Right | 6' 2" | 175 lbs | - |
| Ohara, Takenao | 2B | Philadelphia Hornets | 20 | 08/03/2016 | Suwa | JPN | Right | Right | 6' 2" | 185 lbs | - |
| Ohayashi, Daisuke | CF | Antelope Valley Raptors | 17 | 12/06/2018 | Tokyo | JPN | Left | Left | 6' 4" | 190 lbs | - |
| Olivares, Luis | RF | Antelope Valley Raptors | 20 | 08/05/2016 | San Pedro de Macorís | DOM | Left | Left | 6' 2" | 185 lbs | - |
| Olson, Marty | SP | Toronto Beavers | 27 | 09/11/2009 | Fayetteville | USA | Right | Right | 6' 8" | 235 lbs | $300,000 |
| Orejuala, Francisco | 3B | Philadelphia Hornets | 19 | 07/08/2017 | Humacao | PUR | Right | Right | 6' 2" | 190 lbs | - |
| Ornelas, Juan | 1B | Milwaukee Meerkats | 17 | 06/18/2019 | Nandasmo | NCA | Left | Right | 6' 0" | 190 lbs | - |
| Ortega, Armando | RP | Free Agent | 23 | 11/03/2012 | Plainfield | USA | Right | Right | 6' 1" | 180 lbs | - |
| Ortega, Esteban | C | Philadelphia Hornets | 19 | 08/13/2017 | Teotihuacan | MEX | Right | Right | 6' 0" | 190 lbs | - |
| Ortega, Juan | 3B | Atlanta Hurricanes | 17 | 05/25/2019 | Bayamo | CUB | Right | Right | 6' 1" | 175 lbs | - |
| Ortega, Reynaldo | LF | Chicago Reapers | 18 | 10/03/2017 | Venezuela | CUB | Left | Right | 6' 1" | 185 lbs | - |
| Ortíz, Dani | C | Antelope Valley Raptors | 18 | 01/20/2018 | Tunja | COL | Left | Right | 6' 2" | 195 lbs | - |
| Ortíz, Gilberto | SP | Houston Armadillos | 19 | 08/06/2017 | Havana | CUB | Right | Right | 6' 4" | 195 lbs | - |
| Ortíz, Javier | 1B | Atlanta Hurricanes | 29 | 12/08/2006 | Santo Domingo | DOM | Left | Left | 6' 2" | 270 lbs | $6,560,000 |
| Ortíz, Miguel | SS | Philadelphia Hornets | 17 | 10/18/2018 | Tuxtla Gutiérrez | MEX | Right | Right | 6' 2" | 175 lbs | - |
| Ortíz, Ramón | SP | Appalachian Black Bears | 18 | 11/27/2017 | Santiago | CHI | Left | Left | 6' 3" | 185 lbs | - |
| Oversluizen, Herman | SP | Wilmington Atlantics | 18 | 07/11/2018 | Hoogeveen | NED | Left | Left | 6' 6" | 200 lbs | - |
| Owens, Josh | SP | Free Agent | 23 | 10/25/2012 | Miami | USA | Left | Left | 6' 2" | 195 lbs | - |
