| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|
| O'Donell, Aaron | RP | Houston Bayou Rats | 24 | 03/18/2009 | San Antonio | USA | Left | Left | 6' 1" | 200 lbs | $300,000 | | O'Donnell, Dennis | C | Houston Bayou Rats | 30 | 05/31/2003 | Sudbury | CAN | Right | Right | 6' 0" | 235 lbs | - | | O'Donnell, Leon | RF | Hollywood Stars | 30 | 03/26/2003 | Ithaca | USA | Right | Right | 6' 4" | 205 lbs | $4,520,000 | | O'Slattery, Ken | RP | Hollywood Stars | 26 | 02/23/2007 | Catawissa | USA | Right | Right | 6' 5" | 210 lbs | $510,000 | | Ochoa, Juan | CF | Seattle Pilots | 27 | 07/17/2006 | Tecpan | MEX | Right | Right | 6' 0" | 190 lbs | $300,000 | | Ogawa, Yasujiro | SP | Oakland Oaks | 17 | 11/17/2016 | Urayasu | JPN | Switch | Right | 6' 2" | 185 lbs | - | | Ohayashi, Shinji | RF | Hollywood Stars | 20 | 06/27/2013 | Moriyama | JPN | Left | Left | 6' 2" | 195 lbs | - | | Okada, Mitsunari | 3B | Chicago Whales | 32 | 06/22/2001 | Shiozawa | JPN | Right | Right | 6' 2" | 245 lbs | $3,120,000 | | Okubo, Danjuro | SS | Brooklyn Superbas | 16 | 12/03/2017 | Ogori | JPN | Right | Right | 6' 0" | 175 lbs | - | | Olberos, Felipe | RP | Cleveland Spiders | 29 | 09/29/2004 | Unknown | MEX | Right | Right | 6' 5" | 240 lbs | $300,000 | | Ontiveros, José | SP | Houston Bayou Rats | 30 | 03/17/2003 | Pascagoula | USA | Right | Right | 6' 3" | 230 lbs | $550,000 | | Ordóńez, Alfredo | RP | Philadelphia Quakers | 23 | 11/24/2010 | Tarragona | ESP | Right | Right | 6' 2" | 210 lbs | $300,000 | | Ortega, António | RP | Free Agent | 31 | 01/27/2003 | Brick | USA | Right | Right | 6' 3" | 235 lbs | - | | Ortíz, Alberto | SP | Seattle Pilots | 19 | 03/07/2014 | Candelaria | CUB | Right | Right | 6' 3" | 190 lbs | - | | Ortíz, Enrique | RP | Chicago Whales | 24 | 09/10/2009 | Lazaro Cardenas | MEX | Right | Right | 6' 2" | 215 lbs | - | | Ortíz, Iván | SP | Boston Beaneaters | 16 | 05/12/2017 | Soyapango | SLV | Right | Right | 6' 7" | 200 lbs | - | | Ortíz, Mario | RP | Boston Beaneaters | 26 | 03/29/2007 | Fresnillo | MEX | Right | Right | 6' 0" | 205 lbs | $900,000 | | Ortíz, Raúl | C | St. Louis Perfectos | 33 | 10/05/2000 | Bay Village | USA | Right | Right | 6' 3" | 255 lbs | $25,430,000 | | Ortíz, Roberto | SP | Hollywood Stars | 20 | 02/02/2014 | Chinandega | NCA | Switch | Right | 6' 2" | 180 lbs | - |
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