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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Bob | SP | Free Agent | 18 | 05/07/2005 | Lancaster | USA | Right | Right | 5' 9" | 145 lbs | - |
| O'Donnell, Bobby | SP | Free Agent | 17 | 11/26/2005 | Jacksonville | USA | Right | Right | 6' 0" | 165 lbs | - |
| O'Donnell, Joe | SP | Free Agent | 18 | 09/26/2005 | Richmond | USA | Right | Right | 6' 0" | 165 lbs | - |
| O'Guinn, Jamal | 3B | Free Agent | 24 | 01/19/1999 | Fresno | USA | Right | Right | 6' 4" | 220 lbs | - |
| O'Hearn, Ryan | 1B | Cincinnati Reds | 30 | 07/26/1993 | Frisco | USA | Left | Left | 6' 3" | 200 lbs | $1,100,000 |
| O'Hoppe, Logan | C | Oakland Athletics | 23 | 02/09/2000 | Birmingham | USA | Right | Right | 6' 2" | 185 lbs | $545,000 |
| O'Neill, Matt | C | Free Agent | 26 | 08/20/1997 | Morristown | USA | Right | Right | 6' 0" | 200 lbs | - |
| O'Neill, Tyler | CF | Atlanta Braves | 28 | 06/22/1995 | Vancouver | CAN | Right | Right | 5' 11" | 210 lbs | $1,560,000 |
| Ober, Bailey | SP | Tampa Bay Rays | 28 | 07/12/1995 | Huntersville | USA | Right | Right | 6' 9" | 260 lbs | $545,000 |
| Obrist, Zach | CF | Free Agent | 18 | 09/21/2005 | Des Plaines | USA | Right | Right | 5' 10" | 150 lbs | - |
| Ocampo, Carlos | SP | Free Agent | 25 | 09/03/1998 | Cartagena | COL | Right | Right | 6' 2" | 180 lbs | - |
| Ochoa, Alan | LF | Free Agent | 17 | 05/25/2006 | Rancho Cordova | USA | Right | Right | 6' 1" | 175 lbs | - |
| Ochoa, Luis | C | Free Agent | 17 | 03/29/2006 | Modesto | USA | Right | Right | 6' 0" | 170 lbs | - |
| Ochoa, Luis | CF | Free Agent | 17 | 09/26/2006 | Ft. Worth | USA | Right | Left | 6' 2" | 175 lbs | - |
| Ocker, Nathan | RP | Free Agent | 26 | 12/03/1996 | Middletown (Dauphin County) | USA | Right | Right | 6' 0" | 190 lbs | - |
| October, Luis | C | Free Agent | 20 | 03/06/2003 | Delano | USA | Right | Right | 6' 4" | 195 lbs | - |
| Odom, Joseph | C | Free Agent | 31 | 01/09/1992 | Birmingham | USA | Right | Right | 6' 2" | 225 lbs | - |
| Odor, Rougned | 3B | Free Agent | 29 | 02/03/1994 | Maracaibo | VEN | Left | Right | 5' 11" | 195 lbs | - |
| Ofield, Shamar | CL | Free Agent | 21 | 01/16/2002 | Perris | USA | Right | Right | 6' 3" | 190 lbs | - |
| Ogando, Cristofer | RP | Free Agent | 30 | 10/23/1993 | Santo Domingo | DOM | Right | Right | 6' 3" | 195 lbs | - |
| Ogarro, Tyrese | RF | Free Agent | 17 | 11/07/2005 | New Boston | USA | Left | Left | 6' 4" | 185 lbs | - |
| Ohtani, Shohei | SP | Colorado Rockies | 29 | 07/05/1994 | Iwate | JPN | Left | Right | 6' 4" | 210 lbs | $12,000,000 |
| Okert, Steven | RP | Free Agent | 32 | 07/09/1991 | Riverside | USA | Left | Left | 6' 2" | 205 lbs | - |
| Olczak, Jon | RP | Free Agent | 29 | 11/14/1993 | Fayetteville | USA | Right | Right | 6' 0" | 180 lbs | - |
| Oldfield, Dave | RP | Free Agent | 20 | 03/31/2003 | Garner | USA | Right | Right | 6' 3" | 180 lbs | - |
| Oldford, Maddox | SS | Free Agent | 17 | 02/16/2006 | Côte Saint-Luc | CAN | Right | Right | 6' 3" | 170 lbs | - |
| Olivares, Edward | CF | Los Angeles Dodgers | 27 | 03/06/1996 | Caracas | VEN | Right | Right | 6' 2" | 185 lbs | $545,000 |
| Olivarez, Marcus | RP | Free Agent | 25 | 09/12/1998 | Columbus | USA | Right | Right | 6' 3" | 200 lbs | - |
| Oliver, Jonathan | 3B | Free Agent | 17 | 11/13/2005 | Grand Rapids | USA | Right | Right | 6' 0" | 165 lbs | - |
| Oliver, Zach | RP | Free Agent | 17 | 03/24/2006 | Brookwood | USA | Right | Right | 5' 10" | 155 lbs | - |
| Olsen, Jerry | SP | Free Agent | 17 | 04/11/2006 | Islamorada | USA | Right | Right | 6' 1" | 165 lbs | - |
| Olsen, Jon | SP | Free Agent | 26 | 05/13/1997 | Rancho Cucamonga | USA | Right | Right | 6' 2" | 190 lbs | - |
| Olsen, Josh | RP | Free Agent | 19 | 10/15/2004 | Plainfield | USA | Left | Left | 6' 8" | 205 lbs | - |
| Olson, Isaac | RP | Free Agent | 26 | 09/28/1997 | St. Louis | USA | Right | Right | 6' 6" | 230 lbs | - |
| Olson, Jacob | C | Free Agent | 26 | 05/21/1997 | Monroe | USA | Right | Right | 6' 0" | 200 lbs | - |
| Olson, Matt | 1B | Chicago White Sox | 29 | 03/29/1994 | Atlanta | USA | Left | Right | 6' 5" | 230 lbs | $14,500,000 |
| Olthoff, Braden | SP | Free Agent | 24 | 03/12/1999 | Oceanside | USA | Right | Right | 6' 4" | 205 lbs | - |
| Omori, Goh | SP | Free Agent | 16 | 10/24/2007 | Yachimata | JPN | Right | Right | 6' 4" | 180 lbs | - |
| Ongeri, Mutara | SP | Free Agent | 16 | 01/04/2007 | Los Angeles | USA | Right | Left | 6' 4" | 175 lbs | - |
| Onuoha, Gerain | SP | Free Agent | 16 | 01/28/2007 | Pleasantville | USA | Left | Left | 6' 6" | 185 lbs | - |
| Onuoha, Raheem | RF | Free Agent | 20 | 09/22/2003 | Ontario | USA | Right | Right | 6' 0" | 180 lbs | - |
| Onyshko, Ben | RP | Free Agent | 27 | 10/18/1996 | Winnipeg | CAN | Right | Left | 6' 2" | 205 lbs | - |
| Opp, Cam | RP | Free Agent | 27 | 11/04/1995 | Denver | USA | Left | Left | 5' 10" | 185 lbs | - |
| Oppong, Sharrod | C | Free Agent | 21 | 11/14/2001 | Independence | USA | Switch | Right | 5' 10" | 175 lbs | - |
| Ordonez, Ernny | 3B | Free Agent | 24 | 01/17/1999 | Casa Grande | USA | Right | Right | 6' 2" | 210 lbs | - |
| Ordonez Jr., Magglio | LF | Free Agent | 28 | 10/14/1995 | Ft. Lauderdale | USA | Right | Right | 6' 1" | 200 lbs | - |
| Orellana, Juan | C | Free Agent | 16 | 04/12/2007 | Osage | USA | Left | Right | 6' 4" | 185 lbs | - |
| Oriente, Danny | LF | Free Agent | 26 | 10/08/1997 | Downers Grove | USA | Right | Right | 6' 0" | 190 lbs | - |
| Ornelas, Juan | SP | Free Agent | 20 | 04/12/2003 | St. Marys | USA | Left | Left | 6' 2" | 185 lbs | - |
| Ornelas, Luis | SP | Free Agent | 16 | 08/20/2007 | Santa Ana | USA | Left | Right | 6' 6" | 195 lbs | - |
| Orozco, Alfredo | SP | Free Agent | 20 | 04/08/2003 | Las Vegas | USA | Left | Right | 6' 8" | 215 lbs | - |
| Orozco, Juan | CF | Free Agent | 20 | 09/07/2003 | Houston | USA | Right | Right | 6' 0" | 175 lbs | - |
| Orr, Cody | CF | Free Agent | 24 | 04/02/1999 | Rossford | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ort, Kaleb | RP | Free Agent | 31 | 02/05/1992 | Grand Rapids | USA | Right | Right | 6' 4" | 240 lbs | - |
| Ort, Kaleb | RP | Free Agent | 31 | 02/05/1992 | Grand Rapids | USA | Right | Right | 6' 4" | 240 lbs | - |
| Orta, Juan | CF | Free Agent | 21 | 06/17/2002 | Marysville | USA | Right | Right | 6' 4" | 195 lbs | - |
| Ortega, Dennis | C | Free Agent | 26 | 06/11/1997 | Valencia | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Ortega, Ernesto | SP | Free Agent | 19 | 09/01/2004 | New York | USA | Left | Left | 6' 0" | 165 lbs | - |
| Ortega, Jake | C | Free Agent | 27 | 07/31/1996 | Mission Viejo | USA | Left | Right | 5' 10" | 175 lbs | - |
| Ortega, Rafael | LF | Free Agent | 32 | 05/15/1991 | Cumana | VEN | Left | Right | 5' 11" | 160 lbs | $555,000 |
| Ortega, Sergio | RP | Free Agent | 16 | 01/06/2007 | Santo Domingo | DOM | Switch | Right | 5' 9" | 145 lbs | - |
| Ortiz, Channy | 2B | Free Agent | 24 | 04/11/1999 | Phoenix | USA | Switch | Right | 5' 10" | 155 lbs | - |
| Ortiz, Francisco | C | Free Agent | 24 | 09/15/1999 | Caracas | VEN | Right | Right | 6' 0" | 160 lbs | - |
| Ortiz, Luis | RP | Baltimore Orioles | 24 | 01/27/1999 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 165 lbs | $10,000,000 |
| Ortiz-Mayr, Orlando | SP | Free Agent | 25 | 12/06/1997 | Miami | USA | Right | Right | 6' 3" | 175 lbs | - |
| Osagie, Omari | CF | Free Agent | 15 | 02/28/2008 | New York | USA | Left | Left | 6' 0" | 160 lbs | - |
| Osborne, J.D. | 1B | Free Agent | 28 | 07/13/1995 | Whitby | CAN | Right | Right | 6' 1" | 215 lbs | - |
| Osnowitz, Mitchell | RP | Free Agent | 32 | 07/02/1991 | Normal | USA | Right | Right | 6' 5" | 245 lbs | - |
| Osnowitz, Mitchell | RP | Free Agent | 32 | 07/02/1991 | Normal | USA | Right | Right | 6' 5" | 245 lbs | - |
| Ostberg, Erik | C | Free Agent | 28 | 10/12/1995 | Northampton | USA | Left | Right | 5' 10" | 225 lbs | - |
| Ostendorf, Bob | SP | Free Agent | 18 | 03/26/2005 | Orange Park | USA | Left | Right | 6' 1" | 165 lbs | - |
| Osterberg, Matt | SP | Free Agent | 24 | 04/21/1999 | Unknown | USA | Left | Left | 6' 2" | 200 lbs | - |
| Oswalt, Corey | SP | Free Agent | 30 | 09/03/1993 | San Diego | USA | Right | Right | 6' 5" | 250 lbs | - |
| Otchere, Deshawn | SP | Free Agent | 19 | 09/10/2004 | San Francisco | USA | Right | Right | 6' 6" | 200 lbs | - |
| Otero, Andy | SP | Free Agent | 31 | 06/03/1992 | David | PAN | Left | Left | 5' 9" | 160 lbs | - |
| Otero, Jorge | SP | Free Agent | 17 | 02/03/2006 | Carolina | PUR | Right | Left | 6' 4" | 175 lbs | - |
| Ottavino, Adam | RP | Kansas City Royals | 37 | 11/22/1985 | New York | USA | Switch | Right | 6' 5" | 220 lbs | $545,000 |
| Otto, Glenn | SP | San Diego Padres | 27 | 03/11/1996 | Houston | USA | Right | Right | 6' 3" | 240 lbs | $545,000 |
| Overton, Connor | RP | Free Agent | 30 | 07/24/1993 | Mechanicsville | USA | Right | Right | 6' 0" | 190 lbs | - |
| Overton, Connor | SP | Free Agent | 30 | 07/24/1993 | Mechanicsville | USA | Left | Right | 6' 0" | 190 lbs | - |
| Oviedo, Johan | RP | Milwaukee Brewers | 25 | 03/02/1998 | Havana | CUB | Right | Right | 6' 5" | 210 lbs | $1,460,000 |
| Oviedo, Luis | RP | Baltimore Orioles | 24 | 05/15/1999 | Barquisimeto | VEN | Right | Right | 6' 4" | 170 lbs | $545,000 |
| Owen, Max | SP | Free Agent | 18 | 10/06/2005 | Danville | USA | Left | Right | 6' 1" | 170 lbs | - |
| Ozuna, Marcell | LF | Cleveland Guardians | 32 | 11/12/1990 | Santo Domingo | DOM | Right | Right | 6' 1" | 225 lbs | $15,500,000 |
