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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 | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 7.04 | 8 |
| Jack O'Brien | 2016-2021 | .269 | 49 | 248 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Brien | 2016-2019 | .263 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2015-2016 | .000 | 0 | 0 | 2 | 9 | 3 | 8.01 | 75 |
| Dennis O'Connor | 2015-2017 | .300 | 24 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Day | 2027-2028 | .229 | 14 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Nathaniel O'Heyne | 2021-2022 | .000 | 0 | 0 | 1 | 1 | 0 | 3.70 | 21 |
| William O'Keefe | 2026-2028 | .253 | 11 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Homer O'Lannigan | 2018-2021 | .000 | 0 | 0 | 23 | 33 | 0 | 4.73 | 520 |
| Aaron O'Neill | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 10.80 | 1 |
| Dustin O'Quinlevan | 2018-2019 | .264 | 10 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Will O'Slattery | 2021-2025 | .000 | 0 | 0 | 2 | 5 | 7 | 4.67 | 32 |
| Dale O'Sullivan | 2019-2025 | .204 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ocampo | 2026-2027 | .000 | 0 | 0 | 10 | 16 | 0 | 4.56 | 183 |
| Robert Emmet Odlum | 2024-2028 | .220 | 7 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oglander | 2024-2026 | .274 | 1 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Floyd Oglethorpe | 2018-2018 | .000 | 0 | 0 | 0 | 1 | 0 | 8.78 | 31 |
| Ralph Ogstoun | 2023-2028 | .000 | 0 | 0 | 7 | 6 | 4 | 4.42 | 67 |
| Noburo Oishi | 2028-2028 | .000 | 0 | 0 | 12 | 2 | 0 | 2.07 | 124 |
| Takechi Okubo | 2027-2028 | .250 | 28 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliva | 2017-2022 | .000 | 0 | 0 | 9 | 6 | 4 | 5.26 | 131 |
| Brian Olivares | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2022-2022 | .500 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Olvera | 2020-2022 | .289 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| José Olvera | 2027-2028 | .239 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2028-2028 | .000 | 0 | 0 | 0 | 4 | 2 | 5.04 | 19 |
| Tzu-hsia Ong | 2026-2026 | .000 | 0 | 0 | 3 | 1 | 0 | 6.54 | 11 |
| Anbrosio Oppenes | 2027-2028 | .204 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordóńez | 2027-2027 | .000 | 0 | 0 | 5 | 5 | 0 | 3.12 | 51 |
| José Orihvela | 2027-2028 | .196 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Steve Ormston | 2020-2020 | .500 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Ornelas | 2026-2028 | .000 | 0 | 0 | 12 | 12 | 49 | 5.28 | 91 |
| Jesús Orozco | 2025-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 2.00 | 22 |
| Cisco Ortega | 2022-2028 | .000 | 0 | 0 | 11 | 9 | 46 | 3.75 | 104 |
| David Ortega | 2020-2020 | .180 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 6 |
| Francisco Ortega | 2022-2022 | .271 | 5 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2016-2020 | .000 | 0 | 0 | 5 | 8 | 25 | 5.50 | 47 |
| Alberto Ortíz | 2015-2020 | .343 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2018-2019 | .375 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortíz | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 1.59 | 7 |
| Carlos Ortíz | 2017-2019 | .000 | 0 | 0 | 2 | 5 | 2 | 6.50 | 60 |
| Cisco Ortíz | 2025-2028 | .000 | 0 | 0 | 26 | 11 | 1 | 3.31 | 263 |
| Emílio Ortíz | 2019-2019 | .209 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2028-2028 | .333 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2024-2026 | .000 | 0 | 0 | 19 | 19 | 0 | 3.58 | 220 |
| Manuel Ortíz | 2016-2019 | .000 | 0 | 0 | 12 | 5 | 9 | 4.33 | 158 |
| Martin Ortíz | 2022-2025 | .000 | 0 | 0 | 2 | 4 | 2 | 4.45 | 42 |
| Orlando Ortíz | 2018-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2019-2023 | .309 | 16 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 2024-2026 | .308 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Osborne | 2018-2019 | .290 | 1 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2027-2027 | .235 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Otero | 2028-2028 | .000 | 0 | 0 | 12 | 8 | 0 | 3.45 | 142 |
| Juan Otero | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2025-2025 | .000 | 0 | 0 | 1 | 1 | 18 | 3.89 | 32 |
| Jasper Otto | 2024-2027 | .306 | 24 | 146 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oudekirk | 2016-2021 | .253 | 28 | 187 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2017-2017 | .216 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Owens | 2024-2024 | .000 | 0 | 0 | 2 | 2 | 0 | 2.23 | 31 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Doruk Oyan | 2015-2019 | .000 | 0 | 0 | 12 | 13 | 0 | 5.66 | 249 |
