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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ki-hyuk O | 2018-2020 | .000 | 0 | 0 | 7 | 9 | 0 | 4.06 | 56 |
| Brian O'Billry | 2013-2014 | .000 | 0 | 0 | 17 | 9 | 0 | 3.70 | 193 |
| Clancy O'connell | 2016-2018 | .000 | 0 | 0 | 16 | 4 | 16 | 3.61 | 125 |
| Andrew O'Toole | 2008-2008 | .337 | 12 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ochoa | 2037-2042 | .221 | 22 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ochoa | 2033-2042 | .000 | 0 | 0 | 14 | 8 | 15 | 3.57 | 177 |
| Orinosuke Ohara | 2012-2012 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 3 |
| Miguel Ojeda | 2040-2040 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsuo Okazaki | 2007-2008 | .000 | 0 | 0 | 13 | 12 | 0 | 4.21 | 215 |
| Javier Oliva | 2037-2042 | .263 | 19 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Olivares | 2014-2017 | .000 | 0 | 0 | 4 | 5 | 3 | 5.26 | 56 |
| David Olivas | 2010-2012 | .000 | 0 | 0 | 16 | 17 | 0 | 4.00 | 200 |
| Juan Ordóñez | 2016-2017 | .000 | 0 | 0 | 7 | 14 | 0 | 5.92 | 60 |
| Reynaldo Ornelas | 2008-2009 | .278 | 26 | 124 | 0 | 0 | 0 | 0.00 | 0 |
| Valentim Ornelas | 2015-2021 | .000 | 0 | 0 | 56 | 35 | 0 | 3.39 | 759 |
| Juan Orozco | 2038-2042 | .192 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Orralde | 2030-2042 | .270 | 127 | 529 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Ortega | 2030-2042 | .242 | 166 | 558 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Ortega | 2007-2017 | .271 | 52 | 359 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Ortíz | 2007-2016 | .324 | 168 | 517 | 0 | 0 | 0 | 0.00 | 0 |
| Jaime Ortíz | 2011-2016 | .000 | 0 | 0 | 18 | 22 | 4 | 4.73 | 173 |
| Jesús Ortíz | 2039-2042 | .310 | 11 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2007-2014 | .278 | 19 | 256 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2012-2012 | .000 | 0 | 0 | 8 | 9 | 0 | 3.50 | 104 |
| José Ortíz | 2019-2019 | .000 | 0 | 0 | 2 | 0 | 0 | 3.48 | 15 |
| Lorenzo Ortíz | 2034-2042 | .271 | 100 | 390 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortíz | 2037-2042 | .241 | 20 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortíz | 2012-2012 | .000 | 0 | 0 | 8 | 4 | 0 | 3.72 | 40 |
| Pancho Ortíz | 2041-2042 | .174 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortíz | 2017-2027 | .274 | 110 | 376 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Armando Otero | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 4 |
| Jorge Oyervides | 2034-2041 | .000 | 0 | 0 | 11 | 11 | 1 | 4.23 | 143 |
