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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brian, Jim | CF | Free Agent | 17 | 03/12/2007 | Salt Lake City | USA | Switch | Right | 6' 1" | 175 lbs | - |
| O'Brian, Jose Julio | CF | Free Agent | 17 | 02/12/2007 | Bakersfield | USA | Left | Right | 6' 2" | 165 lbs | - |
| O'Bryan, Jack | RP | Free Agent | 16 | 09/23/2007 | Cedar Rapids | USA | Right | Right | 6' 4" | 180 lbs | - |
| O'Connell, Alex | LF | Milwaukee Brewers | 26 | 09/05/1997 | Durham | USA | Right | Right | 6' 6" | 215 lbs | $3,000,000 |
| O'Day, Aaron | SP | Free Agent | 27 | 10/26/1996 | Marion | USA | Right | Right | 6' 8" | 235 lbs | - |
| O'Day, Henry | C | Free Agent | 29 | 10/07/1994 | Chester | USA | Left | Right | 6' 0" | 205 lbs | - |
| O'Day, John | CL | New York Yankees | 30 | 10/22/1993 | Clearwater | USA | Right | Left | 6' 3" | 240 lbs | $5,500,000 |
| O'Dell, Donald | RF | Free Agent | 28 | 08/12/1995 | Hamtramck | USA | Right | Right | 6' 2" | 210 lbs | - |
| O'Dell, Johnny | 2B | Free Agent | 26 | 09/02/1997 | Cliffside Park | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Donnell, Ethan | CF | Free Agent | 22 | 03/27/2002 | Highlands Ranch | USA | Left | Right | 6' 1" | 190 lbs | - |
| O'Donnell, Trennor | SP | Free Agent | 22 | 06/06/2001 | Southlake | USA | Right | Right | 6' 7" | 235 lbs | - |
| O'Drunen, Steven | 2B | Free Agent | 21 | 12/04/2002 | Roy | USA | Right | Right | 6' 0" | 175 lbs | - |
| O'Halloran, Albert | RP | Free Agent | 17 | 09/16/2006 | Glenwood Springs | USA | Left | Left | 6' 1" | 165 lbs | - |
| O'Halloran, Connor | SP | Free Agent | 21 | 09/01/2002 | Mississauga Beach | CAN | Left | Left | 6' 1" | 190 lbs | - |
| O'Halloran, George | RP | Free Agent | 16 | 10/07/2007 | Muncie | USA | Right | Right | 6' 5" | 185 lbs | - |
| O'Hannon, Trent | LF | New York Mets | 28 | 07/14/1995 | Flower Mound | USA | Left | Left | 6' 0" | 200 lbs | $1,100,000 |
| O'Herlihy, John | LF | Miami Marlins | 24 | 08/03/1999 | Manteca | USA | Right | Right | 6' 0" | 185 lbs | $750,000 |
| O'Neal, Rob | 2B | Free Agent | 20 | 05/24/2003 | Franklin Park | USA | Right | Right | 5' 10" | 175 lbs | - |
| O'Neil, Clayton | RP | Texas Rangers | 26 | 12/13/1997 | Acworth | USA | Right | Right | 6' 4" | 210 lbs | $750,000 |
| O'Reilly, Marc | SP | Free Agent | 17 | 12/20/2006 | Texarkana | USA | Right | Right | 6' 2" | 175 lbs | - |
| O'Tremba, Tanner | LF | Free Agent | 24 | 12/06/1999 | Parker | USA | Right | Right | 5' 11" | 215 lbs | - |
| Obataiye, Jaja | SP | Free Agent | 16 | 01/06/2008 | Verona | USA | Left | Right | 6' 7" | 190 lbs | - |
| Odle, Jacob | RP | Free Agent | 20 | 11/30/2003 | San Diego | USA | Right | Right | 6' 5" | 200 lbs | - |
| Ogden, Mike | RF | Milwaukee Brewers | 28 | 05/30/1995 | Ojai | USA | Switch | Right | 6' 0" | 190 lbs | $2,835,600 |
| Ohayashi, Masutaro | LF | Atlanta Braves | 33 | 07/24/1990 | Toyota | JPN | Left | Left | 6' 0" | 225 lbs | $23,200,000 |
| Ohtani, Shohei | SP | Arizona Diamondbacks | 29 | 07/05/1994 | Iwate | JPN | Left | Right | 6' 4" | 205 lbs | $18,000,000 |
| Ojeda, Félix | CF | St. Louis Cardinals | 17 | 08/09/2006 | Cabaiguan | CUB | Right | Right | 6' 1" | 180 lbs | - |
| Ojeda, Héctor | SS | Milwaukee Brewers | 19 | 02/09/2005 | San Pedro de Macorís | DOM | Left | Right | 6' 2" | 175 lbs | - |
| Okuda, Pedro | 2B | Free Agent | 34 | 04/20/1990 | Marília | BRA | Left | Right | 5' 10" | 180 lbs | - |
| Oldoini, Ludovico | SS | Oakland Athletics | 17 | 12/17/2006 | Turmero | VEN | Right | Right | 6' 4" | 185 lbs | - |
| Oliva, Miguel | SP | Free Agent | 20 | 08/17/2003 | San Juan | PUR | Right | Right | 5' 10" | 175 lbs | - |
| Olmstead, Johnny | 3B | Free Agent | 23 | 07/10/2000 | Costa Mesa | USA | Right | Right | 6' 2" | 190 lbs | - |
| Olmstead, Whit | C | Boston Red Sox | 27 | 09/27/1996 | Netcong | USA | Switch | Right | 6' 1" | 195 lbs | $1,200,000 |
| Olson, Emmett | SP | Free Agent | 21 | 05/15/2002 | Des Plaines | USA | Left | Left | 6' 4" | 225 lbs | - |
| Orf, Brennan | 1B | Free Agent | 22 | 09/06/2001 | Wildwood | USA | Left | Right | 6' 4" | 225 lbs | - |
| Orlandi, Anthony | SP | Miami Marlins | 17 | 10/02/2006 | Turin | ITA | Left | Left | 6' 8" | 200 lbs | - |
| Orozco, Gustavo | SS | Cincinnati Reds | 17 | 10/03/2006 | Santo Domingo | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Orozco, Jesús | C | Oakland Athletics | 25 | 12/07/1998 | Bayaguana | DOM | Right | Right | 6' 1" | 200 lbs | $750,000 |
| Orozco, Luis | SP | Minnesota Twins | 17 | 02/08/2007 | Guacara | VEN | Right | Right | 6' 8" | 200 lbs | - |
| Orozco, Ramiro | SP | Free Agent | 16 | 01/23/2008 | Vega Alta | PUR | Right | Right | 6' 0" | 160 lbs | - |
| Orozco, Sergio | RP | San Francisco Giants | 19 | 04/10/2005 | Yumbo | COL | Right | Right | 6' 0" | 170 lbs | - |
| Orr, Paul | RP | New York Mets | 28 | 05/10/1995 | New Orleans | USA | Right | Right | 6' 6" | 205 lbs | $750,000 |
| Ortega, Tomás | C | Free Agent | 23 | 03/10/2001 | Higüey | DOM | Switch | Right | 6' 0" | 195 lbs | - |
| Ortiz, Jose | CF | Free Agent | 19 | 02/13/2005 | Guayama | PUR | Right | Right | 5' 11" | 170 lbs | - |
| Ortíz, Alejandro | RP | Free Agent | 21 | 05/27/2002 | Santiago | DOM | Switch | Left | 6' 2" | 180 lbs | - |
| Ortíz, Alfredo | SP | Baltimore Orioles | 18 | 01/28/2006 | Santo Domingo | DOM | Right | Right | 6' 6" | 195 lbs | - |
| Ortíz, Claudio | RP | Free Agent | 17 | 01/16/2007 | San José de Guanipa | VEN | Left | Left | 6' 2" | 170 lbs | - |
| Ortíz, Máximo | SP | Free Agent | 21 | 08/08/2002 | Whiting | USA | Right | Right | 6' 3" | 185 lbs | - |
| Ortíz, Octávio | SP | Tampa Bay Rays | 19 | 09/07/2004 | Altamira | DOM | Right | Right | 6' 5" | 195 lbs | - |
| Ortíz, Octávio | 2B | Free Agent | 21 | 03/30/2003 | Mao | DOM | Right | Right | 6' 2" | 190 lbs | - |
| Ortíz, Pedro | SS | Free Agent | 20 | 12/11/2003 | Prattville | USA | Right | Right | 6' 0" | 180 lbs | - |
| Ortíz, Rafael | SP | Free Agent | 17 | 04/10/2007 | Samana | DOM | Right | Right | 5' 11" | 160 lbs | - |
| Ortíz, Victor | RP | Seattle Mariners | 30 | 03/04/1994 | Huntley | USA | Left | Left | 6' 3" | 210 lbs | $750,000 |
| Ortíz, Ángel | SP | Atlanta Braves | 18 | 03/24/2006 | Nagua | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Osborne, John | SP | Free Agent | 15 | 05/01/2008 | Philadelphia | USA | Left | Left | 6' 2" | 165 lbs | - |
| Osman, Graham | SP | Free Agent | 23 | 01/29/2001 | Kittredge | USA | Left | Left | 6' 3" | 185 lbs | - |
| Osuna, Roberto | RP | Houston Astros | 29 | 02/07/1995 | Juan José Ríos | MEX | Right | Right | 6' 2" | 270 lbs | $8,400,000 |
| Oswalt, Tyson | SP | Tampa Bay Rays | 26 | 03/06/1998 | Oxford | USA | Left | Right | 6' 2" | 200 lbs | $3,444,000 |
| Otero, Andy | SP | St. Louis Cardinals | 31 | 06/03/1992 | David | PAN | Left | Left | 5' 9" | 185 lbs | $14,000,000 |
| Otero, Ángel | SP | Miami Marlins | 18 | 09/03/2005 | Santo Domingo | DOM | Left | Left | 6' 2" | 180 lbs | - |
| Ottenhof, Teo | RP | Boston Red Sox | 29 | 03/24/1995 | Twenterand | NED | Right | Left | 6' 0" | 245 lbs | $1,715,200 |
| Ouderkirk, Daniel | SP | Free Agent | 24 | 03/16/2000 | Jacksonville Beach | USA | Right | Right | 6' 9" | 255 lbs | - |
| Owen, Andrew | SP | Free Agent | 22 | 01/20/2002 | Turlock | USA | Right | Right | 6' 3" | 190 lbs | - |
| Owens, Pat | SS | Free Agent | 16 | 07/19/2007 | Dunedin | USA | Right | Right | 6' 1" | 170 lbs | - |
| Owings, Chris | 3B | Free Agent | 32 | 08/12/1991 | Charleston | USA | Right | Right | 5' 9" | 210 lbs | - |
| Owusu-Asiedu, Avery | RF | Free Agent | 20 | 06/16/2003 | Waukesha | USA | Right | Right | 6' 4" | 205 lbs | - |
