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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 |
|---|---|---|---|---|---|---|---|---|---|
| Myles O'Cronin | 2034-2036 | .257 | 4 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Day | 2024-2025 | .244 | 14 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Denny O'Dugan | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 2 | 13.50 | 11 |
| Steve O'Fennaghty | 2037-2037 | .000 | 0 | 0 | 6 | 9 | 0 | 5.42 | 90 |
| Jimmy O'Flahavan | 2028-2028 | .000 | 0 | 0 | 10 | 7 | 0 | 1.90 | 186 |
| Bill O'Halloran | 2034-2034 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor O'Herlihy | 2026-2026 | .361 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Keefe | 2035-2035 | .000 | 0 | 0 | 2 | 7 | 0 | 7.07 | 58 |
| Matt O'Keevan | 2033-2033 | .000 | 0 | 0 | 4 | 2 | 0 | 4.22 | 62 |
| Anderson O'Mara | 2024-2025 | .000 | 0 | 0 | 7 | 14 | 0 | 3.74 | 84 |
| Larry O'Morgan | 2026-2027 | .238 | 2 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neil | 2034-2036 | .195 | 3 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Flemming O'Neill | 2023-2024 | .216 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 2026-2026 | .242 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Brendon O'Rourke | 2035-2036 | .000 | 0 | 0 | 7 | 11 | 8 | 4.18 | 139 |
| Jeffrey O'Tarcert | 2036-2037 | .207 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Marvello Obra | 2028-2030 | .228 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Obregón | 2037-2037 | .232 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ocampo | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 3.56 | 18 |
| Gilberto Ocasio | 2031-2032 | .241 | 7 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ocasio | 2037-2037 | .219 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ocasio | 2034-2036 | .182 | 14 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ochoa | 2025-2028 | .000 | 0 | 0 | 3 | 3 | 8 | 1.89 | 65 |
| Torajiro Ogawa | 2036-2036 | .250 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Oglethorpe | 2031-2033 | .201 | 12 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Robby Oglethorpe | 2031-2032 | .000 | 0 | 0 | 14 | 9 | 0 | 3.20 | 272 |
| Shigenobu Ohayashi | 2029-2029 | .302 | 8 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jae-woo Ohm | 2037-2037 | .353 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Piotr Oja | 2025-2026 | .000 | 0 | 0 | 8 | 7 | 2 | 2.83 | 154 |
| Kazuchika Okada | 2028-2029 | .000 | 0 | 0 | 14 | 9 | 1 | 2.94 | 174 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Noriaki Okada | 2022-2022 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kimi Okubo | 2033-2034 | .233 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Olivo | 2026-2026 | .288 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Ainanani Oliwa | 2031-2032 | .000 | 0 | 0 | 9 | 9 | 39 | 2.78 | 255 |
| Corey Ollerton | 2036-2037 | .209 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gerold Olthof | 2033-2035 | .272 | 33 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| José Olvera | 2025-2025 | .281 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Satoshi Ono | 2029-2034 | .000 | 0 | 0 | 8 | 6 | 0 | 2.63 | 161 |
| Octávio Ontiveros | 2025-2028 | .258 | 4 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Anthon Oort | 2035-2037 | .258 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Oostermeer | 2029-2030 | .257 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ciprian Oprita | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 8.44 | 3 |
| Falco Opsteegh | 2031-2031 | .202 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Oquendo | 2026-2026 | .000 | 0 | 0 | 12 | 5 | 0 | 2.40 | 168 |
| Hugo Ordiales | 2025-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 3.41 | 31 |
| Juan Ordóńez | 2022-2022 | .000 | 0 | 0 | 5 | 3 | 1 | 4.79 | 47 |
| Francisco Ornelas | 2021-2021 | .209 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Román Ornelas | 2032-2034 | .000 | 0 | 0 | 14 | 13 | 29 | 3.21 | 232 |
| Cruz Orneleas | 2030-2030 | .277 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oropeza | 2027-2029 | .000 | 0 | 0 | 2 | 1 | 6 | 1.32 | 87 |
| Curt Orser | 2029-2029 | .000 | 0 | 0 | 3 | 3 | 1 | 2.21 | 52 |
| Carlos Ortega | 2022-2026 | .000 | 0 | 0 | 21 | 14 | 7 | 2.69 | 370 |
| David Ortega | 2030-2030 | .000 | 0 | 0 | 0 | 2 | 8 | 2.18 | 30 |
| José Ortega | 2020-2021 | .263 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2026-2028 | .000 | 0 | 0 | 6 | 1 | 4 | 1.36 | 45 |
| Álex Ortíz | 2036-2036 | .000 | 0 | 0 | 2 | 2 | 0 | 5.57 | 19 |
| Carlos Ortíz | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 1.42 | 7 |
| Gustavo Ortíz | 2030-2034 | .220 | 11 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jack Ortíz | 2034-2034 | .000 | 0 | 0 | 1 | 2 | 3 | 3.96 | 28 |
| Jesús Ortíz | 2024-2025 | .310 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2034-2036 | .281 | 12 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2030-2031 | .194 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| José Antonio Ortíz | 2024-2024 | .296 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2021-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 1.04 | 11 |
| Pancho Ortíz | 2026-2027 | .000 | 0 | 0 | 3 | 6 | 1 | 2.96 | 64 |
| Pedro Ortíz | 2033-2034 | .235 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Royce Ortíz | 2032-2032 | .000 | 0 | 0 | 2 | 2 | 1 | 5.62 | 18 |
| Tony Ortíz | 2025-2025 | .000 | 0 | 0 | 1 | 0 | 0 | 0.87 | 7 |
| Víctor Ortíz | 2035-2035 | .158 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2020-2021 | .000 | 0 | 0 | 4 | 3 | 15 | 3.96 | 21 |
| Ximena Ortíz | 2031-2032 | .248 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| John Orton | 2022-2025 | .000 | 0 | 0 | 23 | 27 | 3 | 3.38 | 417 |
| António Osorio | 2030-2033 | .000 | 0 | 0 | 6 | 7 | 6 | 3.71 | 107 |
| Jesús Osorio | 2029-2029 | .235 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 2022-2023 | .253 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 2026-2028 | .240 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Alfred Osuch | 2031-2033 | .000 | 0 | 0 | 23 | 18 | 3 | 3.26 | 294 |
| Tsugahara Ota | 2036-2037 | .000 | 0 | 0 | 4 | 3 | 2 | 5.80 | 28 |
| Jesús Otero | 2023-2026 | .000 | 0 | 0 | 12 | 21 | 10 | 4.28 | 212 |
| Aldo Ottens | 2035-2036 | .000 | 0 | 0 | 14 | 6 | 0 | 2.55 | 166 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 6 | 1 | 0 | 2.23 | 67 |
| Marvin Overbeek | 2030-2035 | .241 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Rich Overby | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 0 | 2.20 | 17 |
| DeMarvion Overshown | 2031-2032 | .259 | 10 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Giel Overwater | 2029-2031 | .000 | 0 | 0 | 17 | 6 | 0 | 2.29 | 229 |
| Clarence Oveur | 2026-2029 | .000 | 0 | 0 | 10 | 11 | 2 | 4.64 | 146 |
| Jorge Oyas | 2034-2035 | .000 | 0 | 0 | 18 | 14 | 0 | 3.29 | 273 |
