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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brian O'Billry | 2010-2010 | .000 | 0 | 0 | 0 | 2 | 0 | 4.18 | 18 |
| Andrew O'Toole | 2008-2010 | .294 | 6 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Alfonso Ochoa | 2028-2032 | .155 | 1 | 7 | 23 | 21 | 0 | 2.68 | 257 |
| Takayuki Ogawa | 2011-2011 | .000 | 0 | 0 | 0 | 1 | 10 | 1.84 | 21 |
| Orinosuke Ohara | 2009-2009 | .000 | 0 | 1 | 3 | 4 | 0 | 3.67 | 38 |
| Kazunari Oka | 2020-2020 | .333 | 0 | 0 | 2 | 5 | 0 | 5.40 | 35 |
| Tetsuo Okazaki | 2008-2017 | .151 | 1 | 10 | 23 | 33 | 0 | 4.15 | 347 |
| David Olivas | 2012-2012 | .000 | 0 | 0 | 0 | 1 | 0 | 11.74 | 7 |
| Jason Oliver | 2013-2013 | .118 | 0 | 1 | 3 | 2 | 0 | 3.67 | 51 |
| José Olvera | 2038-2038 | .000 | 0 | 0 | 1 | 0 | 0 | 1.86 | 24 |
| Ramón Ornelas | 2009-2009 | .176 | 0 | 2 | 6 | 2 | 0 | 3.14 | 19 |
| Roberto Ortega | 2013-2013 | .000 | 0 | 0 | 2 | 0 | 0 | 1.53 | 34 |
| António Ortíz | 2009-2011 | .247 | 1 | 9 | 17 | 16 | 0 | 4.68 | 150 |
| Cristóbal Ortíz | 2037-2037 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ortíz | 2037-2039 | .212 | 0 | 1 | 9 | 7 | 3 | 3.28 | 94 |
| Jorge Ortíz | 2012-2012 | 1.000 | 0 | 0 | 0 | 2 | 0 | 8.10 | 8 |
| José Ortíz | 2016-2017 | .000 | 0 | 0 | 6 | 4 | 3 | 4.94 | 69 |
| Luis Manuel Ortíz | 2021-2024 | .103 | 1 | 3 | 7 | 11 | 1 | 3.95 | 112 |
| Pablo Ortíz | 2007-2011 | .177 | 1 | 8 | 29 | 11 | 0 | 3.16 | 393 |
| Raúl Ortíz | 2038-2039 | .166 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 2035-2039 | .232 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Otero | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 2.17 | 20 |
| Juan Otero | 2007-2008 | .330 | 20 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Valentín Otero | 2039-2039 | .000 | 0 | 0 | 0 | 0 | 0 | 1.23 | 4 |
| Michael Owens | 2017-2017 | .301 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
