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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Dan | RP | Phoenix Strongmen | 26 | 03/26/1989 | Brushy Creek | USA | Right | Right | 6' 0" | 200 lbs | $507,500 |
| O'Leahy, Dáithí | SS | Free Agent | 21 | 03/17/1994 | Los Angeles | USA | Left | Right | 6' 0" | 180 lbs | - |
| O'Neil, Richard | 1B | Phoenix Strongmen | 33 | 09/11/1981 | Nashville | USA | Right | Right | 5' 11" | 225 lbs | $18,000,000 |
| O'Neill, Brian | CF | Free Agent | 19 | 04/02/1996 | New York | USA | Right | Right | 6' 0" | 180 lbs | - |
| O'Spillane, Matthew | SP | Baltimore Axemen | 35 | 07/01/1979 | Broken Arrow | USA | Left | Left | 6' 1" | 210 lbs | $8,600,000 |
| O'Sullivan, Will | C | Free Agent | 17 | 09/28/1997 | Philadelphia | USA | Right | Right | 6' 5" | 215 lbs | - |
| Olivo, José | CF | Free Agent | 18 | 05/11/1996 | Bayamón | PUR | Right | Right | 6' 3" | 185 lbs | - |
| Ordóńez, David | C | Free Agent | 17 | 12/28/1997 | Seattle | USA | Left | Right | 6' 3" | 215 lbs | - |
| Ornallas, Pedro | LF | Philadelphia Tornadoes | 17 | 04/05/1998 | Santo Domingo | DOM | Left | Left | 6' 3" | 190 lbs | - |
| Ortíz, Carlos | 2B | Memphis Chickens | 28 | 11/17/1986 | Tlaxcala | MEX | Right | Right | 6' 0" | 200 lbs | $507,500 |
| Ortíz, Jorge | SP | Free Agent | 18 | 10/23/1996 | San Juan | PUR | Left | Left | 6' 5" | 200 lbs | - |
| Ortíz, Salvador | C | Austin Wizards | 18 | 03/20/1997 | Bonao | DOM | Right | Right | 6' 1" | 190 lbs | - |
| Owens, Ernest | SS | Free Agent | 18 | 10/03/1996 | Muskogee | USA | Right | Right | 6' 0" | 175 lbs | - |
