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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2016-2020 | .000 | 0 | 0 | 0 | 2 | 0 | 6.14 | 9 |
| Dave O'Day | 2015-2017 | .294 | 23 | 177 | 0 | 0 | 0 | 0.00 | 0 |
| P.J. O'Keefe | 2015-2023 | .268 | 25 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2023-2023 | .000 | 0 | 0 | 3 | 3 | 5 | 1.71 | 29 |
| Mark O'Monaghan | 2017-2018 | .264 | 8 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2023-2023 | .000 | 0 | 0 | 2 | 2 | 16 | 2.98 | 16 |
| Eric O'Neill | 2020-2020 | .403 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin O'Quinlevan | 2023-2023 | .216 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2015-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 1.08 | 6 |
| Dale O'Sullivan | 2017-2018 | .444 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Toole | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 1.50 | 3 |
| Alin Oanta | 2017-2018 | .000 | 0 | 0 | 11 | 9 | 0 | 5.51 | 87 |
| Héctor Ocampo | 2020-2023 | .000 | 0 | 0 | 7 | 21 | 1 | 5.19 | 159 |
| Noriaki Okada | 2022-2022 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olivares | 2015-2018 | .300 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2016-2023 | .275 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Olvera | 2016-2019 | .243 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2016-2019 | .000 | 0 | 0 | 11 | 6 | 11 | 4.22 | 186 |
| Anbrosio Oppenes | 2020-2023 | .272 | 9 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2015-2019 | .270 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2021-2021 | .270 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2016-2018 | .276 | 3 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 10.38 | 5 |
| José Ortega | 2021-2021 | .237 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2023-2023 | .248 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2022-2023 | .324 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2020 | .279 | 19 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2016-2018 | .000 | 0 | 0 | 7 | 11 | 6 | 5.81 | 83 |
| Luis Ortíz | 2016-2023 | .000 | 0 | 0 | 9 | 15 | 3 | 4.06 | 247 |
| Orlando Ortíz | 2018-2020 | .200 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Vincente Ortíz | 2021-2022 | .000 | 0 | 0 | 5 | 6 | 16 | 4.81 | 17 |
| Roger Osborne | 2015-2017 | .282 | 16 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jasper Otto | 2022-2022 | .236 | 3 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 5 | 6 | 0 | 2.90 | 115 |
| Doruk Oyan | 2023-2023 | .000 | 0 | 0 | 5 | 7 | 0 | 4.83 | 82 |
