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|
| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Scott | RF | Free Agent | 30 | 08/27/1998 | Thetford Mines | CAN | Left | Left | 5' 11" | 235 lbs | - |
| O'Day, Tom | SP | South Carolina Bombers | 35 | 11/25/1993 | South Amherst | USA | Right | Left | 6' 1" | 235 lbs | $18,940,000 |
| O'Dell, Adam | LF | Chicago Hitmen | 25 | 01/27/2003 | Cleveland | USA | Right | Right | 6' 2" | 210 lbs | $500,000 |
| O'Farrell, David | RF | Brooklyn Black Knights | 23 | 03/19/2005 | Saanich | CAN | Left | Left | 6' 2" | 200 lbs | $500,000 |
| O'Neil, Clayton | RP | Portland Beavers | 35 | 08/11/1993 | Iselin | USA | Right | Right | 6' 0" | 300 lbs | $4,000,000 |
| O'Neil, Mark | RF | Georgia Grays | 32 | 09/03/1996 | Fairlawn | USA | Left | Left | 6' 0" | 170 lbs | $15,880,000 |
| Oakden, Roy | CF | Georgia Grays | 24 | 02/22/2004 | Horsham | ENG | Left | Right | 5' 9" | 175 lbs | - |
| Oakes, John | SS | Havana Stogies | 25 | 10/07/2003 | Toronto | CAN | Right | Right | 6' 3" | 200 lbs | $2,040,000 |
| Oakley, Maurice | SP | San Francisco Earthquakes | 21 | 02/02/2007 | Mt. Isa | AUS | Right | Right | 6' 2" | 180 lbs | - |
| Oakley, Sterling | SP | Cabo San Lucas Toreros | 25 | 04/07/2003 | Sydney | AUS | Right | Right | 6' 2" | 185 lbs | - |
| Oberacker, Augustus | SS | Manhattan Beach Patriots | 25 | 12/18/2003 | Bad Vilbel | GER | Switch | Right | 6' 2" | 195 lbs | - |
| Oberle, David | SP | Dallas Texans | 25 | 08/23/2003 | Velbert | GER | Left | Right | 6' 8" | 220 lbs | - |
| Ocampo, Anastasio | 1B | Jacksonville Jacks | 26 | 09/21/2002 | Unknown | MEX | Left | Left | 6' 0" | 215 lbs | $500,000 |
| Ocampo, José | CF | Portland Beavers | 18 | 11/01/2010 | Unknown | PUR | Right | Right | 6' 1" | 180 lbs | - |
| Ocampo, Manny | RP | Free Agent | 28 | 07/08/2000 | Barcelona | VEN | Right | Right | 6' 1" | 190 lbs | - |
| Ocampo, Manuel | RP | Free Agent | 22 | 04/03/2006 | Maracay | VEN | Right | Right | 6' 3" | 195 lbs | - |
| Ocasio, António | 2B | Manhattan Beach Patriots | 21 | 01/27/2007 | Caracas | VEN | Right | Right | 6' 1" | 185 lbs | - |
| Ocasio, Esteban | LF | San Diego Hops | 18 | 09/24/2010 | Mixco | GUA | Left | Left | 6' 2" | 185 lbs | - |
| Ochoa, José | RP | Minnesota Berserkers | 30 | 06/15/1998 | Los Teques | VEN | Switch | Right | 6' 0" | 260 lbs | $5,860,000 |
| Ochoa, Juan | CF | So Cal Republic | 16 | 07/04/2012 | Pinar del Rio | CUB | Switch | Right | 6' 1" | 175 lbs | - |
| Ochoa, Rodrigo | SS | Kansas City Tornadoes | 17 | 06/27/2011 | Salitrillos | CRC | Right | Right | 6' 0" | 170 lbs | - |
| Oda, Eisuke | RP | Free Agent | 22 | 02/20/2006 | Ichinoseki | JPN | Right | Right | 6' 3" | 180 lbs | - |
| Odijk, Jeffrey | CF | Georgia Grays | 17 | 05/08/2011 | Weesp | NED | Right | Right | 6' 1" | 175 lbs | - |
| Ogawa, Mitsuhide | LF | Jacksonville Jacks | 26 | 11/17/2002 | Nishinomiya | JPN | Right | Right | 6' 4" | 225 lbs | - |
| Ogawa, Sosuke | 2B | Free Agent | 21 | 05/23/2007 | Hirosaki | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Ogawa, Tomohiko | CF | Kansas City Tornadoes | 30 | 10/08/1998 | Nirasaki | JPN | Left | Left | 6' 1" | 240 lbs | - |
| Ogawa, Toshinobu | 1B | Free Agent | 21 | 03/21/2007 | Tokushima | JPN | Right | Left | 6' 1" | 210 lbs | - |
| Ogburn, Bradley | SS | Quebec Armada | 20 | 02/01/2008 | Nottingham | ENG | Right | Right | 6' 3" | 195 lbs | - |
| Ogden, Ryan | C | Jacksonville Jacks | 24 | 04/18/2004 | Hoylake-West Kirby | ENG | Right | Right | 6' 2" | 220 lbs | - |
| Ohashi, Taisuke | 2B | Duke City Danger | 29 | 11/23/1999 | Nobeoka | JPN | Right | Right | 5' 10" | 200 lbs | - |
| Ohayashi, Hidehira | C | Jacksonville Jacks | 22 | 08/29/2006 | Niigata | JPN | Right | Right | 6' 4" | 200 lbs | $500,000 |
| Ohayashi, Hirofumi | RP | Free Agent | 20 | 07/29/2008 | Misawa | JPN | Left | Left | 6' 3" | 190 lbs | - |
| Ohayashi, Kyoshi | SS | Jersey Jesters | 19 | 05/15/2009 | Unknown | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Ohayashi, Masaaki | SP | San Francisco Earthquakes | 24 | 09/11/2004 | Yashiro | JPN | Left | Right | 6' 4" | 210 lbs | - |
| Ohayashi, Michihiro | 1B | Eureka Hornets | 21 | 06/11/2007 | Kobe | JPN | Right | Right | 6' 4" | 230 lbs | - |
| Ohayashi, Tatsui | CF | Georgia Grays | 25 | 09/17/2003 | Gojo | JPN | Right | Right | 6' 3" | 210 lbs | - |
| Ohayashi, Tetsui | CF | San Diego Hops | 20 | 06/27/2008 | Chigasaki | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Ohira, Seikichi | SP | Chicago Hitmen | 16 | 06/06/2012 | Ichikawa | JPN | Switch | Right | 6' 2" | 180 lbs | - |
| Oike, Tatsuzo | C | Kansas City Tornadoes | 24 | 05/12/2004 | Yokohama | JPN | Switch | Right | 6' 0" | 205 lbs | - |
| Oishi, Kenko | SS | Georgia Grays | 24 | 06/14/2004 | Tokyo | JPN | Switch | Right | 6' 0" | 185 lbs | - |
| Oishi, Manobu | SS | Cabo San Lucas Toreros | 25 | 11/24/2003 | Kasamatsu | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Oishi, Yoshimatsu | LF | Kansas City Tornadoes | 21 | 03/18/2007 | Karasuyama | JPN | Right | Right | 6' 3" | 205 lbs | - |
| Ojima, Keitaro | 1B | New York Mafia | 37 | 12/04/1991 | Yame | JPN | Right | Right | 6' 3" | 275 lbs | $7,500,000 |
| Ojima, Munemori | SP | Cabo San Lucas Toreros | 18 | 11/26/2010 | Unknown | JPN | Switch | Right | 6' 3" | 180 lbs | - |
| Ojima, Muneyaki | SP | So Cal Republic | 20 | 04/21/2008 | Fukuoka | JPN | Right | Right | 6' 2" | 180 lbs | - |
| Oka, Okakura | CF | Kansas City Tornadoes | 27 | 01/12/2001 | Sakai | JPN | Right | Right | 6' 2" | 210 lbs | - |
| Okabe, Shoichi | SP | Georgia Grays | 26 | 09/19/2002 | Unknown | JPN | Left | Right | 6' 3" | 210 lbs | - |
| Okabe, Takahiro | SS | Free Agent | 19 | 09/07/2009 | Shizuoka | JPN | Right | Right | 6' 1" | 170 lbs | - |
| Okada, Kenshin | SP | Mile High Mustangs | 28 | 03/07/2000 | Ako | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Okada, Natsume | CF | Jersey Jesters | 20 | 08/11/2008 | Samukawa | JPN | Right | Right | 6' 5" | 205 lbs | - |
| Okada, Sadakuno | SP | Las Vegas Gamblers | 25 | 03/05/2003 | Yokohama | JPN | Left | Left | 5' 10" | 175 lbs | - |
| Okada, Takeji | 1B | So Cal Republic | 28 | 10/09/2000 | Kanuma | JPN | Right | Right | 6' 2" | 225 lbs | - |
| Okada, Tsuginori | SP | So Cal Republic | 26 | 02/10/2002 | Sagamihara | JPN | Left | Left | 6' 0" | 185 lbs | - |
| Okada, Tsuramatsu | CF | Free Agent | 25 | 08/12/2003 | Sowa | JPN | Switch | Right | 6' 0" | 190 lbs | - |
| Okada, Yoshihiro | SS | Eureka Hornets | 27 | 09/30/2001 | Yamato | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Okada, Yoshitora | SP | So Cal Republic | 23 | 05/11/2005 | Naha | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Okamoto, Kinnosuke | SP | Jersey Jesters | 20 | 04/19/2008 | Takatsuki | JPN | Left | Left | 6' 6" | 200 lbs | - |
| Okamoto, Tadataka | SP | Cabo San Lucas Toreros | 21 | 10/02/2007 | Tsuchiura | JPN | Switch | Right | 6' 10" | 225 lbs | - |
| Okazaki, Hayato | RF | New York Mafia | 25 | 08/20/2003 | Tokyo | JPN | Right | Right | 6' 6" | 230 lbs | - |
| Okazaki, Shohei | SP | Duke City Danger | 28 | 10/06/2000 | Osaka | JPN | Left | Left | 6' 5" | 230 lbs | - |
| Okolita, Peter | SP | San Diego Hops | 23 | 10/20/2005 | Melbourne | AUS | Right | Right | 6' 1" | 190 lbs | - |
| Olamina, Fella | SP | Georgia Grays | 23 | 06/12/2005 | Alberton | RSA | Left | Left | 6' 7" | 210 lbs | - |
| Olberos, Miguel | 1B | Brooklyn Black Knights | 19 | 05/17/2009 | Ecatepec | MEX | Left | Left | 6' 2" | 200 lbs | - |
| Oldknow, Kai | SP | Las Vegas Gamblers | 25 | 03/03/2003 | Poulton-le-Fylde | ENG | Left | Left | 6' 1" | 185 lbs | - |
| Olivarez, Juan | SP | Dallas Texans | 17 | 04/22/2011 | Unknown | MEX | Left | Right | 6' 3" | 180 lbs | - |
| Oliveira, Paco | C | Jacksonville Jacks | 27 | 11/27/2001 | Mariara | VEN | Switch | Right | 6' 2" | 215 lbs | - |
| Olivo, Jorge | SP | Mile High Mustangs | 18 | 01/03/2010 | Unknown | MEX | Right | Right | 6' 2" | 185 lbs | - |
| Olushegun, Ahungena | SP | Dallas Texans | 25 | 09/10/2003 | Mpophomeni | RSA | Left | Left | 6' 3" | 195 lbs | - |
| Olvera, Alfonso | RF | Minnesota Berserkers | 18 | 08/24/2010 | Unknown | DOM | Left | Left | 6' 0" | 180 lbs | - |
| Omori, Taro | SS | Free Agent | 33 | 10/18/1995 | Koriyama | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Onishi, Toshinobu | 3B | Free Agent | 23 | 11/27/2005 | Yokohama | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Ono, Hideki | 2B | Jersey Jesters | 23 | 01/03/2005 | Nagano | JPN | Right | Right | 6' 3" | 215 lbs | - |
| Ono, Koryusai | SP | Georgia Grays | 20 | 02/20/2008 | Nakatsu | JPN | Right | Right | 6' 2" | 185 lbs | - |
| Ono, Oda | C | Manhattan Beach Patriots | 20 | 07/17/2008 | Hachioji | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Ono, Yasujiro | RP | Brooklyn Black Knights | 35 | 03/02/1993 | New York | USA | Right | Right | 6' 0" | 235 lbs | $3,400,000 |
| Onodera, Kiyohira | SS | Free Agent | 28 | 10/29/2000 | Suzuka | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Ontiveros, Héctor | 3B | Minnesota Berserkers | 28 | 07/31/2000 | El Limón | VEN | Left | Right | 6' 2" | 230 lbs | - |
| Ontiveros, Jorge | SP | San Francisco Earthquakes | 16 | 06/03/2012 | Havana | CUB | Right | Right | 6' 6" | 200 lbs | - |
| Oosterman, Shalom | CF | Chicago Hitmen | 18 | 08/08/2010 | Unknown | ARU | Right | Right | 6' 1" | 170 lbs | - |
| Ooyendijk, Ramon | CF | Chicago Hitmen | 27 | 04/21/2001 | Menaldumadeel | NED | Left | Left | 6' 0" | 190 lbs | $5,500,000 |
| Orati, Giuseppe | RP | Jersey Jesters | 24 | 01/26/2004 | Trinitapoli | ITA | Switch | Right | 5' 9" | 165 lbs | $500,000 |
| Ordóńez, Jesús | SP | Portland Beavers | 17 | 03/01/2011 | Unknown | CUB | Left | Right | 6' 0" | 170 lbs | - |
| Orduno, Enrique | SP | Minnesota Berserkers | 16 | 10/22/2012 | Pinar del Rio | CUB | Switch | Right | 5' 11" | 160 lbs | - |
| Organ, Stuart | SP | Mile High Mustangs | 20 | 05/23/2008 | Southampton | ENG | Right | Right | 6' 6" | 195 lbs | - |
| Ornelas, Armando | RF | Columbus Codebreakers | 18 | 03/11/2010 | Unknown | CUB | Switch | Right | 5' 11" | 175 lbs | - |
| Ornelas, Cristián | RP | Free Agent | 18 | 02/11/2010 | Unknown | MEX | Switch | Right | 6' 3" | 180 lbs | - |
| Ornelza, Jesús | CF | Omaha Titans | 19 | 06/06/2009 | Unknown | NCA | Switch | Right | 5' 10" | 165 lbs | - |
| Oropeza, Chris | 2B | Cabo San Lucas Toreros | 16 | 07/03/2012 | Havana | CUB | Right | Right | 6' 2" | 180 lbs | - |
| Orosco, Orlando | SS | Georgia Grays | 19 | 08/11/2009 | Unknown | NCA | Switch | Right | 6' 0" | 185 lbs | - |
| Orozco, Héctor | CF | Georgia Grays | 19 | 08/16/2009 | Unknown | PUR | Right | Right | 6' 1" | 175 lbs | - |
| Orozco, Juan | SP | Cabo San Lucas Toreros | 17 | 01/12/2011 | Unknown | CUB | Left | Right | 5' 11" | 160 lbs | - |
| Orozco, Robert | RF | Minnesota Berserkers | 17 | 05/23/2011 | Banes | CUB | Left | Left | 6' 0" | 175 lbs | - |
| Orozco, Willie | SS | Bloomington Blazers | 17 | 09/11/2011 | San Luis Potosí | MEX | Right | Right | 6' 2" | 185 lbs | - |
| Ortega, Bert | 1B | Dallas Texans | 17 | 02/28/2011 | Caimitillo | PAN | Left | Left | 6' 2" | 200 lbs | - |
| Ortega, Carlos | SP | Minnesota Berserkers | 18 | 11/08/2010 | San Juan | PUR | Right | Right | 6' 2" | 175 lbs | - |
| Ortega, César | CF | San Francisco Earthquakes | 19 | 03/22/2009 | Unknown | MEX | Left | Right | 6' 4" | 195 lbs | - |
| Ortega, Gustavo | SP | South Carolina Bombers | 23 | 12/26/2005 | San Felipe | VEN | Right | Right | 6' 2" | 185 lbs | - |
| Ortega, Jorge | SP | Quebec Armada | 19 | 12/02/2009 | Unknown | GUA | Right | Right | 6' 7" | 205 lbs | - |
| Ortega, José | 1B | Eureka Hornets | 18 | 10/26/2010 | Unknown | CRC | Left | Left | 6' 2" | 200 lbs | - |
| Ortega, Juan | SP | Cabo San Lucas Toreros | 19 | 12/20/2009 | San Juan | PUR | Right | Right | 5' 11" | 175 lbs | - |
| Ortega, Rafael | SP | Quebec Armada | 24 | 12/24/2004 | Barcelona | VEN | Left | Left | 6' 2" | 205 lbs | - |
| Ortega, Ramiro | RP | Free Agent | 38 | 05/26/1990 | Netcong | USA | Right | Right | 6' 0" | 195 lbs | - |
| Ortega, Raúl | 1B | Duke City Danger | 18 | 07/21/2010 | Puebla | MEX | Right | Right | 6' 2" | 200 lbs | - |
| Ortega, Ricardo | C | Mile High Mustangs | 22 | 03/16/2006 | El Limón | VEN | Right | Right | 6' 2" | 205 lbs | - |
| Ortega, Rubén | SP | Jacksonville Jacks | 22 | 01/06/2006 | Planeta Rica | COL | Right | Right | 6' 3" | 180 lbs | - |
| Ortega, Vicente | 2B | Havana Stogies | 19 | 11/19/2009 | Unknown | MEX | Right | Right | 6' 0" | 170 lbs | - |
| Ortega, Virgilio | SS | Brooklyn Black Knights | 17 | 01/23/2011 | Unknown | MEX | Right | Right | 6' 2" | 170 lbs | - |
| Ortíz, Adrián | 2B | Free Agent | 35 | 11/02/1993 | Newport Beach | USA | Right | Right | 6' 2" | 255 lbs | - |
| Ortíz, Alberto | RF | Free Agent | 27 | 01/12/2001 | Mixco | GUA | Left | Left | 6' 2" | 210 lbs | - |
| Ortiz, Alejandro | SS | Mile High Mustangs | 16 | 01/27/2012 | San Miguelito | PAN | Right | Right | 6' 4" | 180 lbs | - |
| Ortíz, Ángel | SS | Dallas Texans | 19 | 11/05/2009 | Unknown | PUR | Right | Right | 6' 2" | 180 lbs | - |
| Ortíz, Ánibal | SS | Mile High Mustangs | 19 | 10/21/2009 | Unknown | CUB | Right | Right | 6' 1" | 175 lbs | - |
| Ortíz, António | SP | Cabo San Lucas Toreros | 21 | 05/29/2007 | Cali | COL | Right | Right | 6' 6" | 200 lbs | - |
| Ortíz, António | RP | Free Agent | 17 | 04/08/2011 | Las Delicias | HON | Left | Right | 6' 1" | 170 lbs | - |
| Ortíz, Carlos | SS | Columbus Codebreakers | 19 | 12/26/2009 | Unknown | CRC | Right | Right | 6' 3" | 190 lbs | - |
| Ortíz, Carlos | SP | Eureka Hornets | 18 | 07/07/2010 | Unknown | MEX | Switch | Right | 6' 0" | 175 lbs | - |
| Ortiz, Cesar | SP | Mile High Mustangs | 17 | 01/20/2011 | Managua | NCA | Left | Left | 6' 2" | 180 lbs | - |
| Ortíz, Claudio | SP | Columbus Codebreakers | 27 | 02/17/2001 | Buenos Aires | ARG | Left | Left | 6' 1" | 190 lbs | - |
| Ortíz, Claudio | SP | Mile High Mustangs | 20 | 02/19/2008 | Matanzas | CUB | Left | Left | 6' 1" | 180 lbs | - |
| Ortiz, Elias | SP | Portland Beavers | 16 | 06/28/2012 | San José | CRC | Left | Left | 6' 2" | 175 lbs | - |
| Ortíz, Fernando | CF | Havana Stogies | 18 | 02/23/2010 | Unknown | PUR | Right | Right | 6' 4" | 200 lbs | - |
| Ortíz, Fernando | 3B | Free Agent | 27 | 05/31/2001 | Havana | CUB | Right | Right | 6' 0" | 200 lbs | - |
| Ortíz, Gerardo | 3B | Free Agent | 19 | 10/09/2009 | Acapulco | MEX | Right | Right | 6' 2" | 190 lbs | - |
| Ortíz, Germán | SP | Mile High Mustangs | 28 | 03/05/2000 | Ciudad Guayana | VEN | Left | Left | 5' 11" | 190 lbs | - |
| Ortíz, Gustavo | LF | Free Agent | 18 | 06/21/2010 | Havana | CUB | Left | Left | 5' 10" | 160 lbs | - |
| Ortíz, Javier | 2B | Eureka Hornets | 21 | 03/12/2007 | Chivilcoy | ARG | Switch | Right | 6' 1" | 190 lbs | - |
| Ortíz, Javier | C | Chicago Hitmen | 26 | 04/11/2002 | Unknown | MEX | Right | Right | 6' 1" | 195 lbs | $500,000 |
| Ortíz, Javier | SP | Georgia Grays | 22 | 02/01/2006 | Bogota | COL | Right | Right | 5' 11" | 175 lbs | - |
| Ortíz, Jesús | SP | Columbus Codebreakers | 18 | 07/15/2010 | Unknown | NCA | Left | Right | 6' 1" | 180 lbs | - |
| Ortíz, Jorge | SP | San Diego Hops | 33 | 08/11/1995 | Carrizal | VEN | Left | Left | 6' 0" | 205 lbs | $1,300,000 |
| Ortíz, Jorge | SP | Eureka Hornets | 18 | 01/08/2010 | Bayamón | PUR | Left | Left | 6' 5" | 190 lbs | - |
| Ortíz, Jorge | SP | Jersey Jesters | 17 | 09/07/2011 | Unknown | NCA | Right | Right | 6' 2" | 180 lbs | - |
| Ortíz, José | SP | New York Mafia | 28 | 07/11/2000 | Calabozo | VEN | Left | Left | 6' 1" | 180 lbs | - |
| Ortíz, José | C | Free Agent | 28 | 06/15/2000 | Yaritagua | VEN | Right | Right | 6' 3" | 230 lbs | - |
| Ortíz, José | LF | Eureka Hornets | 19 | 11/23/2009 | Unknown | PAN | Right | Right | 6' 2" | 190 lbs | - |
| Ortiz, Jose | SS | Seattle Sasquatch | 17 | 03/13/2011 | Cuyotenango | GUA | Switch | Right | 6' 1" | 180 lbs | - |
| Ortiz, Jose | SP | Brooklyn Black Knights | 16 | 04/16/2012 | Santiago | CRC | Right | Right | 5' 10" | 160 lbs | - |
| Ortiz, Jose | SS | Portland Beavers | 18 | 12/21/2010 | Santiago | DOM | Right | Right | 5' 10" | 155 lbs | - |
| Ortíz, Juan | SP | So Cal Republic | 19 | 09/21/2009 | Unknown | PAN | Left | Right | 6' 0" | 165 lbs | - |
| Ortíz, León | SP | So Cal Republic | 18 | 01/12/2010 | Unknown | MEX | Left | Left | 6' 1" | 175 lbs | - |
| Ortíz, Luis | RP | Free Agent | 18 | 12/13/2010 | San Rafael | CRC | Switch | Left | 6' 3" | 180 lbs | - |
| Ortíz, Luis | RP | Free Agent | 20 | 09/27/2008 | Unknown | CRC | Right | Right | 6' 3" | 190 lbs | - |
| Ortíz, Mario | SP | Columbus Codebreakers | 18 | 04/23/2010 | Unknown | CRC | Right | Right | 6' 3" | 185 lbs | - |
| Ortíz, Pablo | C | Manhattan Beach Patriots | 18 | 12/29/2010 | Unknown | PUR | Right | Right | 6' 4" | 215 lbs | - |
| Ortíz, Ramón | SP | Georgia Grays | 23 | 02/13/2005 | Barinas | VEN | Right | Right | 6' 7" | 210 lbs | - |
| Ortíz, Ramón | SP | Las Vegas Gamblers | 18 | 03/06/2010 | Puebla | MEX | Right | Right | 5' 10" | 165 lbs | - |
| Ortíz, Ricardo | SP | San Diego Hops | 19 | 02/04/2009 | Unknown | PUR | Left | Left | 6' 3" | 175 lbs | - |
| Ortiz, Richard | RP | Omaha Titans | 16 | 01/18/2012 | Santiago | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Orton, Don | CF | Maple Marauders | 32 | 03/30/1996 | Trois-Rivičres | CAN | Right | Right | 6' 1" | 225 lbs | $2,300,000 |
| Osada, Tsutomu | SP | So Cal Republic | 22 | 11/06/2006 | Yokaichi | JPN | Left | Right | 5' 11" | 170 lbs | - |
| Osborn, Zak | SP | San Francisco Earthquakes | 18 | 10/02/2010 | Unknown | ARU | Right | Right | 6' 1" | 175 lbs | - |
| Oseguera, Rogelio | C | Las Vegas Gamblers | 17 | 08/20/2011 | Managua | NCA | Right | Right | 5' 10" | 175 lbs | - |
| Oshima, Masaaki | SS | San Francisco Earthquakes | 25 | 06/22/2003 | Fukui | JPN | Switch | Right | 6' 0" | 185 lbs | - |
| Oskamp, Halmar | SP | Quebec Armada | 23 | 05/07/2005 | Groningen | NED | Right | Right | 6' 1" | 200 lbs | - |
| Osmond, Alan | SP | San Francisco Earthquakes | 27 | 07/24/2001 | Folkestone | ENG | Right | Right | 6' 2" | 190 lbs | - |
| Osorio, Alex | C | Cabo San Lucas Toreros | 17 | 08/25/2011 | Panama | PAN | Switch | Right | 6' 2" | 195 lbs | - |
| Osorio, Felipe | SS | Minnesota Berserkers | 18 | 08/23/2010 | Unknown | MEX | Right | Right | 6' 3" | 180 lbs | - |
| Osorio, Jorge | 2B | Columbus Codebreakers | 20 | 11/18/2008 | La Cruz | CHI | Left | Right | 6' 0" | 190 lbs | - |
| Osorio, José | SP | Kansas City Tornadoes | 28 | 06/26/2000 | Ciudad Guayana | VEN | Right | Right | 6' 4" | 210 lbs | - |
| Ospira, Rafael | 3B | Omaha Titans | 32 | 12/18/1996 | Phoenix | USA | Left | Right | 6' 3" | 210 lbs | $1,100,000 |
| Ostendorff, Sal | LF | Free Agent | 33 | 07/17/1995 | Bonneauville | USA | Left | Right | 5' 8" | 240 lbs | - |
| Oswald, Maurice | RP | Free Agent | 28 | 10/09/2000 | London | ENG | Right | Right | 6' 0" | 185 lbs | - |
| Ota, Eisuke | SP | Mile High Mustangs | 25 | 11/25/2003 | Unknown | JPN | Right | Right | 6' 2" | 200 lbs | $500,000 |
| Otani, Izumo | C | Free Agent | 21 | 05/09/2007 | Kisogawa | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Otani, Shozo | SS | Jacksonville Jacks | 27 | 07/30/2001 | Katsuragi | JPN | Right | Right | 5' 11" | 190 lbs | - |
| Otero, José | C | Jersey Jesters | 18 | 08/16/2010 | Unknown | SLV | Right | Right | 6' 4" | 205 lbs | - |
| Otero, Luis | SP | Minnesota Berserkers | 19 | 09/05/2009 | Unknown | MEX | Switch | Right | 5' 10" | 165 lbs | - |
| Otero, Vicente | RP | Free Agent | 32 | 05/29/1996 | Guantanamo | CUB | Left | Left | 5' 9" | 245 lbs | - |
| Otsuka, Kunio | SP | Mile High Mustangs | 17 | 09/06/2011 | Wakayama | JPN | Right | Right | 6' 1" | 175 lbs | - |
| Otsuka, Mitsuzuka | LF | Free Agent | 32 | 11/13/1996 | Funabashi | JPN | Left | Left | 6' 0" | 245 lbs | - |
| Otsuka, Yoshinori | SP | Minnesota Berserkers | 28 | 11/01/2000 | Minamichita | JPN | Right | Right | 6' 6" | 220 lbs | - |
| Ouwens, Filip | SP | Portland Beavers | 19 | 09/29/2009 | Unknown | ARU | Right | Right | 6' 0" | 175 lbs | - |
| Ouyang, Shi-xian | SP | Mile High Mustangs | 17 | 01/24/2011 | Unknown | TPE | Right | Right | 6' 3" | 185 lbs | - |
| Overhill, Ryan | SS | Free Agent | 22 | 02/27/2006 | Blandford Forum | ENG | Left | Right | 6' 2" | 180 lbs | - |
| Oviedo, Oscar | C | San Diego Hops | 16 | 01/01/2012 | Santiago | DOM | Left | Right | 6' 3" | 200 lbs | - |
| Ow, Hsui-chen | 1B | Free Agent | 21 | 01/12/2007 | Unknown | CAN | Right | Right | 6' 4" | 215 lbs | - |
| Owens, Tom | SP | Jersey Jesters | 35 | 08/19/1993 | Brooklyn | USA | Right | Right | 6' 6" | 255 lbs | $1,100,000 |
| Oyama, Takafumi | CF | Free Agent | 25 | 10/26/2003 | Kisarazu | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Oynelas, Juan | SS | Free Agent | 28 | 01/25/2000 | Ciudad Guayana | VEN | Right | Right | 6' 1" | 200 lbs | - |
| Ozawa, Hoshi | SS | San Diego Hops | 17 | 10/21/2011 | Higashiosaka | JPN | Right | Right | 6' 2" | 170 lbs | - |
| Ozawa, Kichibei | RP | Havana Stogies | 26 | 09/17/2002 | Izumi | JPN | Right | Right | 6' 0" | 195 lbs | $500,000 |
