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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 | 2015-2020 | .275 | 22 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Monaghan | 2017-2018 | .264 | 8 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Neill | 2020-2020 | .403 | 2 | 6 | 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 | 2020-2020 | .000 | 0 | 0 | 2 | 11 | 0 | 5.73 | 46 |
| Brian Olivares | 2015-2018 | .300 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2016-2016 | .289 | 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 | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2015-2019 | .270 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2016-2018 | .276 | 3 | 43 | 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 | 2016-2019 | .000 | 0 | 0 | 2 | 2 | 3 | 4.52 | 77 |
| Orlando Ortíz | 2018-2020 | .200 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Roger Osborne | 2015-2017 | .282 | 16 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 5 | 6 | 0 | 2.90 | 115 |
