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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Beirne, Dusty | SP | Georgia Bulldogs | 19 | 09/06/1995 | Long Beach | USA | Right | Right | 6' 0" | 230 lbs | - |
| O'Brien, Dwight | 1B | Free Agent | 22 | 01/25/1992 | Queens | USA | Right | Right | 5' 11" | 180 lbs | - |
| O'Brien, Howard | CL | Baylor Bears | 21 | 02/21/1993 | Alameda | USA | Left | Left | 5' 6" | 180 lbs | - |
| O'Connell, Nate | RF | Free Agent | 22 | 08/15/1992 | Brattleboro | USA | Left | Left | 6' 0" | 170 lbs | - |
| O'Connor, Ben | SP | Free Agent | 23 | 09/27/1991 | Raleigh | USA | Right | Right | 6' 1" | 185 lbs | - |
| O'Connor, Carson | 3B | Mississippi State Bulldogs | 19 | 03/06/1995 | Cherry Hill | USA | Right | Right | 6' 1" | 180 lbs | - |
| O'Connor, Troy | 1B | Free Agent | 23 | 09/25/1991 | Cincinnati | USA | Right | Right | 6' 0" | 225 lbs | - |
| O'Day, Phil | 3B | Free Agent | 24 | 12/24/1990 | Kissimmee | USA | Switch | Right | 6' 2" | 215 lbs | - |
| O'Day, Tom | SP | North Carolina Tar Heels | 21 | 11/25/1993 | South Amherst | USA | Right | Left | 6' 1" | 215 lbs | - |
| O'Donnell, Tim | SP | Free Agent | 24 | 10/06/1990 | Saddle Brook | USA | Right | Right | 6' 4" | 195 lbs | - |
| O'Dowling, Howard | CF | Stanford Cardinals | 18 | 01/18/1996 | Westport | USA | Left | Left | 6' 3" | 210 lbs | - |
| O'Farrell, Eric | CL | Free Agent | 22 | 08/11/1992 | Sapulpa | USA | Right | Right | 5' 10" | 195 lbs | - |
| O'Farrell, Tom | RF | Free Agent | 23 | 07/01/1991 | Dyer | USA | Right | Right | 6' 1" | 195 lbs | - |
| O'Halloran, Johnny | CF | Stanford Cardinals | 21 | 03/09/1993 | Rosemont | USA | Left | Left | 5' 8" | 175 lbs | - |
| O'Hanvey, Bob | 2B | Cal State Fullerton Titans | 21 | 01/05/1993 | Chicago | USA | Right | Right | 6' 0" | 205 lbs | - |
| O'Herlihy, Jack | SP | Vanderbilt Commodores | 21 | 04/10/1993 | Valley Station | USA | Right | Right | 6' 6" | 240 lbs | - |
| O'Herlihy, Tim | CL | Alabama Crimson Tide | 21 | 09/09/1993 | Lowell | USA | Right | Right | 5' 10" | 220 lbs | - |
| O'Neal, Harlan | MR | Free Agent | 23 | 11/15/1991 | Los Angeles | USA | Right | Right | 6' 2" | 195 lbs | - |
| O'Neal, Joe | CF | South Carolina Gamecocks | 21 | 10/06/1993 | Flint | USA | Right | Right | 6' 2" | 220 lbs | - |
| O'Neal, Marvin | CF | Free Agent | 23 | 12/20/1991 | Casper | USA | Left | Right | 6' 3" | 170 lbs | - |
| O'Neal, Nick | MR | Virginia Cavaliers | 20 | 02/10/1994 | Frankfort | USA | Right | Right | 6' 0" | 170 lbs | - |
| O'Neil, Clayton | SP | North Carolina Tar Heels | 21 | 08/11/1993 | Iselin | USA | Right | Right | 6' 0" | 255 lbs | - |
| O'Neil, James | 3B | Free Agent | 22 | 07/12/1992 | Memphis | USA | Left | Right | 6' 2" | 220 lbs | - |
| O'Neil, Paul | SS | Free Agent | 23 | 12/17/1991 | Bartlett | USA | Right | Right | 6' 0" | 165 lbs | - |
| O'Neill, Doug | 3B | Free Agent | 22 | 02/21/1992 | Nashville | USA | Left | Right | 5' 11" | 185 lbs | - |
| O'Quinn, Bill | RF | Vanderbilt Commodores | 21 | 01/08/1993 | Kennesaw | USA | Right | Left | 6' 5" | 180 lbs | - |
| O'Quinn, Dave | RF | Mississippi State Bulldogs | 21 | 03/19/1993 | Cheyenne | USA | Right | Left | 6' 0" | 205 lbs | - |
| O'Quinn, Kevin | 1B | Arkansas Razorbacks | 20 | 10/21/1994 | New York | USA | Left | Right | 6' 6" | 230 lbs | - |
| O'Rorke, Everett | RF | Baylor Bears | 20 | 01/24/1994 | San Marcos | USA | Right | Right | 6' 2" | 185 lbs | - |
| O'Rourke, Mark | MR | Free Agent | 23 | 03/09/1991 | Detroit | USA | Left | Left | 6' 8" | 215 lbs | - |
| Oceguero, José | RF | Free Agent | 23 | 06/27/1991 | Guaynabo | PUR | Right | Right | 5' 10" | 210 lbs | - |
| Ochoa, Cisco | 1B | Ohio State Buckeyes | 19 | 04/30/1995 | Humacao | PUR | Right | Right | 6' 6" | 240 lbs | - |
| Ochoa, Miguel | 1B | Kansas Jayhawks | 19 | 02/24/1995 | Sulphur Springs | USA | Switch | Left | 6' 1" | 185 lbs | - |
| Oglethorpe, Tony | RF | Free Agent | 22 | 01/13/1992 | Manhattan | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ojeda, Norberto | CF | Iowa State Cyclones | 20 | 02/01/1994 | Seaside | USA | Right | Right | 6' 0" | 190 lbs | - |
| Olarte, António | 2B | Free Agent | 24 | 12/25/1990 | New York | USA | Switch | Right | 5' 11" | 185 lbs | - |
| Oliver, B.J. | SP | Oregon Ducks | 20 | 08/04/1994 | Manasota Key | USA | Left | Left | 5' 9" | 210 lbs | - |
| Oliver, Bob | LF | Free Agent | 23 | 04/28/1991 | Brownsville | USA | Left | Left | 6' 0" | 185 lbs | - |
| Oliver, Clarence | 2B | Free Agent | 22 | 08/19/1992 | East Hartford | USA | Right | Right | 6' 0" | 200 lbs | - |
| Oliver, Dan | MR | Stanford Cardinals | 20 | 10/31/1994 | Queens | USA | Right | Right | 5' 10" | 225 lbs | - |
| Oliver, Denny | 2B | Virginia Cavaliers | 19 | 12/30/1995 | Lincoln | USA | Right | Right | 6' 2" | 175 lbs | - |
| Oliver, John | CF | Free Agent | 22 | 01/05/1992 | Spartanburg | USA | Right | Right | 6' 0" | 175 lbs | - |
| Olivo, Jesús | LF | Free Agent | 22 | 02/03/1992 | Humacao | PUR | Left | Right | 6' 3" | 210 lbs | - |
| Olsen, Kevin | RF | Auburn Tigers | 21 | 12/16/1993 | Green Valley | USA | Left | Right | 6' 2" | 165 lbs | - |
| Olsen, Warren | SS | Free Agent | 23 | 08/24/1991 | Memphis | USA | Switch | Right | 6' 0" | 185 lbs | - |
| Olson, Bob | 2B | Kansas Jayhawks | 20 | 07/20/1994 | Alamosa | USA | Right | Right | 6' 1" | 165 lbs | - |
| Olson, Dexter | MR | Florida State Seminoles | 19 | 12/31/1995 | Lexington | USA | Right | Right | 6' 4" | 230 lbs | - |
| Olson, Mark | 3B | Arkansas Razorbacks | 19 | 12/31/1995 | Bronx | USA | Right | Right | 6' 0" | 185 lbs | - |
| Olvera, Luis | SP | UCLA Bruins | 19 | 12/19/1995 | Payson | USA | Left | Right | 6' 2" | 195 lbs | - |
| Ono, Yasujiro | SP | Georgia Bulldogs | 21 | 03/02/1993 | New York | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ordway, Bill | C | California Golden Bears | 19 | 10/02/1995 | Los Angeles | USA | Switch | Right | 5' 11" | 185 lbs | - |
| Orozco, Sergio | LF | Stanford Cardinals | 20 | 03/06/1994 | Caracas | VEN | Switch | Right | 6' 4" | 170 lbs | - |
| Orr, Rob | CF | Free Agent | 23 | 02/13/1991 | North Platte | USA | Switch | Right | 6' 0" | 165 lbs | - |
| Ortega, Alonso | SP | TCU Horned Frogs | 19 | 02/16/1995 | La Romana | DOM | Right | Right | 5' 11" | 205 lbs | - |
| Ortíz, Adrián | 1B | LSU Tigers | 21 | 11/02/1993 | Newport Beach | USA | Right | Right | 6' 2" | 215 lbs | - |
| Ortíz, Carlos | SS | Alabama Crimson Tide | 21 | 10/04/1993 | Caracas | VEN | Right | Right | 6' 1" | 225 lbs | - |
| Ortíz, Félix | SP | Mississippi State Bulldogs | 21 | 05/15/1993 | New York | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ortíz, Jesús | SP | Tennessee Volunteers | 21 | 11/23/1993 | Santiago | DOM | Right | Right | 6' 2" | 215 lbs | - |
| Ortíz, Jesús | 1B | Free Agent | 22 | 11/18/1992 | Plano | USA | Switch | Right | 6' 4" | 195 lbs | - |
| Ortíz, José | SP | California Golden Bears | 20 | 11/04/1994 | Beech Grove | USA | Left | Left | 6' 1" | 215 lbs | - |
| Ortíz, Juan | SS | UCLA Bruins | 21 | 08/05/1993 | Thornton | USA | Switch | Right | 6' 0" | 190 lbs | - |
| Ortíz, Manny | CF | Rice Owls | 19 | 07/24/1995 | Newport News | USA | Left | Left | 5' 11" | 170 lbs | - |
| Ortíz, Rubén | 2B | Free Agent | 23 | 05/03/1991 | New York | USA | Right | Right | 6' 0" | 165 lbs | - |
| Osborn, Dave | LF | Ole Miss Rebels | 21 | 01/14/1993 | Fabens | USA | Left | Left | 6' 0" | 180 lbs | - |
| Osborne, Tyrone | 3B | Free Agent | 23 | 02/14/1991 | Chicago | USA | Right | Right | 6' 1" | 185 lbs | - |
| Osorio, Jaime | C | Texas Longhorns | 21 | 10/07/1993 | Arecibo | PUR | Right | Right | 6' 0" | 215 lbs | - |
| Osorio, Ricardo | 1B | Georgia Tech Yellow Jackets | 19 | 03/21/1995 | Martinsville | USA | Right | Right | 5' 11" | 200 lbs | - |
| Osorio, Sergio | C | Free Agent | 23 | 05/25/1991 | Oxnard | USA | Switch | Right | 6' 0" | 190 lbs | - |
| Ostendorff, Sal | LF | Alabama Crimson Tide | 19 | 07/17/1995 | Bonneauville | USA | Left | Right | 5' 8" | 205 lbs | - |
| Otero, Jesús | 1B | Free Agent | 23 | 10/22/1991 | San Diego | USA | Right | Right | 6' 0" | 245 lbs | - |
| Ovsienko, Fabi | 3B | Florida Gators | 20 | 11/12/1994 | Hicksville | USA | Left | Right | 5' 11" | 190 lbs | - |
| Owen, Jason | C | Free Agent | 22 | 08/07/1992 | Chesapeake | USA | Right | Right | 6' 4" | 210 lbs | - |
| Owens, Lane | 3B | Michigan Wolverines | 21 | 11/13/1993 | Mystic Island | USA | Switch | Right | 6' 2" | 205 lbs | - |
| Owens, Sherwood | 2B | Free Agent | 22 | 06/11/1992 | Brockton | USA | Left | Right | 6' 0" | 195 lbs | - |

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