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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Lonnie O'Brien | 2007-2007 | .278 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Tony O'Bryan | 2025-2030 | .268 | 55 | 268 | 0 | 0 | 0 | 0.00 | 0 |
| Scott O'Callahan | 2008-2009 | .238 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Clark O'Clery | 2007-2009 | .211 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony O'Connor | 2022-2022 | .000 | 0 | 0 | 1 | 0 | 0 | 1.50 | 10 |
| Rich O'Connor | 2017-2017 | .000 | 0 | 0 | 5 | 2 | 0 | 2.82 | 50 |
| Greg O'Day | 2009-2009 | .139 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Day | 2034-2034 | .351 | 9 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Samuel O'Day | 2037-2038 | .283 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff O'Fennaghty | 2007-2009 | .263 | 21 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Keith O'Higgins | 2031-2032 | .333 | 0 | 1 | 18 | 13 | 0 | 4.59 | 257 |
| Ben O'Keefe | 2007-2008 | .000 | 0 | 0 | 1 | 0 | 0 | 5.16 | 29 |
| Jim O'Kerwan | 2012-2013 | .276 | 64 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Ray O'Larly | 2038-2038 | .263 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Loan | 2018-2019 | .283 | 22 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Travis O'Monahan | 2037-2037 | .308 | 1 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Todd O'Neil | 2007-2007 | 1.000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Fred O'Neill | 2007-2008 | .184 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neill | 2032-2033 | .000 | 0 | 0 | 5 | 7 | 7 | 5.75 | 118 |
| Scott O'Neill | 2036-2038 | .241 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Roy O'Reilly | 2010-2010 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Anderson O'Rorke | 2038-2038 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Tormey | 2012-2013 | .077 | 1 | 2 | 7 | 9 | 26 | 3.82 | 131 |
| Dean Oglethorpe | 2031-2036 | .279 | 16 | 112 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Oglethorpe | 2027-2027 | .342 | 22 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Shotaro Ohayashi | 2010-2013 | .000 | 0 | 0 | 4 | 6 | 28 | 4.43 | 65 |
| Yoshiaki Ohayashi | 2014-2019 | .287 | 47 | 251 | 0 | 0 | 0 | 0.00 | 0 |
| Okura Oike | 2013-2014 | .000 | 0 | 0 | 6 | 15 | 0 | 5.59 | 82 |
| Tadamasa Oike | 2007-2009 | .000 | 0 | 0 | 13 | 8 | 5 | 3.48 | 176 |
| Orlando Ojeda | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 9.64 | 6 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Rafael Ojeda | 2007-2009 | .242 | 23 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Oliva | 2013-2016 | .000 | 0 | 0 | 1 | 2 | 2 | 2.36 | 50 |
| Reynaldo Oliva | 2038-2038 | .330 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Olivarez | 2012-2013 | .297 | 16 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Olivas | 2023-2023 | .348 | 9 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Oliveira | 2009-2009 | .000 | 0 | 0 | 3 | 7 | 0 | 4.48 | 66 |
| Roger Oliver | 2031-2032 | .000 | 0 | 0 | 12 | 15 | 67 | 3.77 | 169 |
| Jason Olsen | 2007-2007 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| In-ho Om | 2029-2029 | .000 | 0 | 0 | 16 | 5 | 0 | 4.56 | 142 |
| Sosuke Omori | 2007-2009 | .000 | 0 | 0 | 17 | 20 | 0 | 4.78 | 214 |
| Takaaki Omori | 2016-2017 | .000 | 0 | 0 | 9 | 7 | 29 | 4.89 | 121 |
| Takehide Ono | 2013-2015 | .000 | 0 | 0 | 2 | 12 | 33 | 3.34 | 119 |
| Luis Ontiveros | 2008-2008 | .000 | 0 | 0 | 4 | 2 | 1 | 3.49 | 65 |
| Ricardo Ontiveros | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 3 | 0.00 | 12 |
| Gilberto Orabuena | 2038-2038 | .329 | 11 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| David Ordóńez | 2037-2037 | .325 | 13 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Orosco | 2010-2012 | .264 | 17 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Orosco | 2010-2015 | .259 | 10 | 64 | 0 | 0 | 0 | 15.00 | 0 |
| Paul Orr | 2029-2035 | .000 | 0 | 0 | 21 | 30 | 13 | 5.75 | 397 |
| Alberto Ortega | 2013-2021 | .000 | 0 | 0 | 13 | 39 | 0 | 5.51 | 160 |
| José Ortega | 2034-2034 | .000 | 0 | 0 | 4 | 7 | 33 | 3.92 | 69 |
| José Ortega | 2028-2028 | .250 | 17 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2030-2035 | .248 | 31 | 170 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortíz | 2020-2023 | .276 | 39 | 174 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Ortíz | 2014-2016 | .271 | 15 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ortíz | 2032-2038 | .000 | 0 | 0 | 27 | 47 | 7 | 5.91 | 556 |
| José Ortíz | 2015-2015 | .000 | 0 | 0 | 3 | 1 | 1 | 4.70 | 106 |
| José Ortíz | 2008-2009 | .192 | 4 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2038-2038 | .310 | 0 | 5 | 0 | 0 | 0 | 6.75 | 2 |
| Juan Ortíz | 2034-2034 | .000 | 0 | 0 | 4 | 4 | 11 | 5.88 | 86 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pedro Ortíz | 2035-2035 | .307 | 13 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2007-2009 | .000 | 0 | 0 | 9 | 4 | 1 | 3.63 | 91 |
| Román Ortíz | 2007-2009 | .000 | 0 | 0 | 3 | 0 | 1 | 3.41 | 38 |
| Wilson Ortíz | 2032-2033 | .287 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Osborn | 2031-2036 | .246 | 14 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Edgardo Osorio | 2024-2025 | .273 | 27 | 167 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Osuba | 2036-2037 | .331 | 50 | 203 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Otero | 2011-2016 | .191 | 11 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Doyle Otterburn | 2017-2019 | .340 | 14 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Sloan Otto | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 1 | 2.77 | 18 |
| Gildun Ouakili | 2011-2021 | .000 | 0 | 0 | 73 | 62 | 2 | 4.89 | 847 |
| William Ouellette | 2011-2013 | .000 | 0 | 0 | 7 | 11 | 3 | 5.95 | 100 |
| Henry Owens | 2033-2038 | .000 | 0 | 0 | 13 | 13 | 3 | 5.06 | 241 |
| Kelly Owens | 2013-2016 | .229 | 25 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Robin Owens | 2033-2033 | .000 | 0 | 0 | 14 | 6 | 0 | 4.06 | 158 |
