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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 | 2016-2021 | .000 | 0 | 0 | 3 | 4 | 1 | 6.93 | 54 |
| Tim O'Brian | 2042-2042 | .186 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Bob O'Bryan | 2046-2047 | .000 | 0 | 0 | 3 | 13 | 0 | 5.22 | 83 |
| Eddie O'Bryan | 2020-2029 | .275 | 10 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2021-2022 | .000 | 0 | 0 | 2 | 1 | 0 | 2.45 | 13 |
| Robert O'Connor | 2031-2031 | .266 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2015-2019 | .231 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Day | 2041-2042 | .000 | 0 | 0 | 6 | 14 | 2 | 8.18 | 100 |
| Junior O'Day | 2042-2044 | .240 | 11 | 49 | 1 | 0 | 1 | 7.82 | 7 |
| Alex O'Dell | 2043-2045 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 16 |
| Christian O'Dell | 2024-2024 | .246 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Bailey O'Donnell | 2045-2045 | .000 | 0 | 0 | 1 | 5 | 0 | 3.16 | 45 |
| Jimmy O'Flahavan | 2039-2040 | .000 | 0 | 0 | 9 | 8 | 0 | 3.79 | 83 |
| Trevor O'Herlihy | 2030-2030 | .214 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Nathaniel O'Heyne | 2022-2022 | .000 | 0 | 0 | 4 | 5 | 0 | 5.79 | 40 |
| William O'Keefe | 2035-2036 | .270 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Matt O'Keevan | 2036-2038 | .000 | 0 | 0 | 4 | 12 | 1 | 4.94 | 115 |
| Carl O'Malloy | 2020-2022 | .000 | 0 | 0 | 5 | 4 | 4 | 4.86 | 84 |
| Anderson O'Mara | 2026-2036 | .000 | 0 | 0 | 10 | 7 | 16 | 3.58 | 49 |
| Mark O'Monaghan | 2018-2018 | .434 | 6 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 2022-2022 | .277 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Neal | 2038-2038 | .375 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Neil | 2045-2046 | .000 | 0 | 0 | 11 | 5 | 0 | 4.35 | 135 |
| Eric O'Neill | 2023-2026 | .285 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Dana O'Quinlevan | 2046-2046 | .059 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Slattery | 2045-2047 | .000 | 0 | 0 | 7 | 4 | 5 | 4.85 | 67 |
| Ron O'Slattery | 2015-2023 | .000 | 0 | 0 | 26 | 14 | 1 | 3.33 | 238 |
| Ricky O'Toole | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 3.86 | 7 |
| Alin Oanta | 2019-2021 | .000 | 0 | 0 | 10 | 6 | 0 | 4.70 | 144 |
| Goodluck Obasanjo | 2035-2041 | .000 | 0 | 0 | 15 | 18 | 5 | 4.45 | 204 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Gabriel Obregón | 2044-2045 | .261 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Ocasio | 2044-2044 | .281 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ocasio | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ocegueda | 2033-2036 | .000 | 0 | 0 | 4 | 1 | 0 | 5.19 | 79 |
| Luis Ochoa | 2028-2036 | .000 | 0 | 0 | 14 | 4 | 22 | 2.88 | 120 |
| Hirohisa Ogasawara | 2029-2030 | .315 | 6 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Robby Oglethorpe | 2034-2036 | .000 | 0 | 0 | 12 | 12 | 0 | 4.90 | 138 |
| Munemori Ohara | 2024-2032 | .345 | 9 | 48 | 0 | 0 | 0 | 7.71 | 1 |
| Sakutaro Ohayashi | 2041-2041 | .000 | 0 | 0 | 4 | 0 | 1 | 3.00 | 23 |
| Shigenobu Ohayashi | 2033-2033 | .262 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2023-2023 | .000 | 0 | 0 | 7 | 4 | 0 | 4.09 | 54 |
| Jae-woo Ohm | 2039-2040 | .367 | 14 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 2025-2025 | .282 | 17 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Piotr Oja | 2027-2036 | .000 | 0 | 0 | 22 | 15 | 1 | 3.68 | 303 |
| Kazuchika Okada | 2038-2039 | .000 | 0 | 0 | 2 | 1 | 0 | 4.21 | 28 |
| Noriaki Okada | 2022-2023 | .256 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Josuke Okumura | 2041-2041 | .000 | 0 | 0 | 4 | 7 | 0 | 5.23 | 66 |
| Juan Oleastro | 2046-2046 | .271 | 14 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliva | 2037-2038 | .333 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Richello Oliva | 2044-2044 | .206 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olivares | 2018-2019 | .256 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Olivo | 2030-2031 | .176 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ainanani Oliwa | 2037-2047 | .000 | 0 | 0 | 8 | 6 | 11 | 4.00 | 64 |
| Corey Ollerton | 2039-2046 | .283 | 36 | 172 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2017-2019 | .312 | 19 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Doug Olsen | 2041-2041 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2016-2022 | .277 | 40 | 147 | 0 | 0 | 0 | 0.00 | 0 |
| Marc Olsen | 2041-2041 | .000 | 0 | 0 | 0 | 6 | 1 | 8.68 | 14 |
| Gerold Olthof | 2036-2036 | .265 | 6 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Olvera | 2015-2015 | .240 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jesús Olvero | 2021-2021 | .000 | 0 | 0 | 3 | 0 | 1 | 0.56 | 11 |
| Doppo Omikado | 2036-2038 | .000 | 0 | 0 | 5 | 1 | 1 | 3.83 | 70 |
| Yasuhiko Onishi | 2045-2045 | .242 | 6 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Octávio Ontiveros | 2031-2033 | .235 | 6 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Oort | 2047-2047 | .000 | 0 | 0 | 0 | 1 | 0 | 7.71 | 1 |
| Phil Oostermeer | 2033-2040 | .268 | 16 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Opio | 2044-2044 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Oquendo | 2029-2036 | .000 | 0 | 0 | 7 | 8 | 44 | 3.07 | 87 |
| Dave Orchard | 2015-2024 | .326 | 21 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordóñez | 2029-2032 | .000 | 0 | 0 | 17 | 25 | 0 | 5.18 | 138 |
| Gerald Orlebar | 2047-2047 | .000 | 0 | 0 | 5 | 1 | 0 | 2.64 | 39 |
| Sasha Orlovsky | 2044-2046 | .192 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2021-2031 | .263 | 6 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Román Ornelas | 2039-2040 | .000 | 0 | 0 | 7 | 2 | 2 | 3.49 | 105 |
| Luis Oropeza | 2031-2036 | .000 | 0 | 0 | 6 | 2 | 6 | 4.60 | 51 |
| António Orozco | 2046-2046 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2017-2032 | .250 | 8 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orozco | 2025-2025 | .378 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2017-2020 | .250 | 28 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2045-2045 | .000 | 0 | 0 | 1 | 0 | 1 | 0.00 | 4 |
| Juan Ortega | 2023-2024 | .263 | 1 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Ortega | 2015-2015 | .312 | 5 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 2028-2029 | .000 | 0 | 0 | 3 | 18 | 4 | 6.74 | 31 |
| Salvador Ortega | 2047-2047 | .219 | 7 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2017 | .282 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2020-2021 | .000 | 0 | 0 | 14 | 12 | 0 | 5.27 | 112 |
| Emílio Ortíz | 2023-2024 | .181 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Ortíz | 2044-2046 | .254 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Ortíz | 2035-2035 | .157 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2038-2043 | .294 | 6 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Ortíz | 2032-2032 | .000 | 0 | 0 | 3 | 0 | 0 | 1.52 | 20 |
| José Ortíz | 2019-2028 | .000 | 0 | 0 | 10 | 21 | 40 | 5.70 | 84 |
| Lorenzo Ortíz | 2045-2045 | .205 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2021-2022 | .000 | 0 | 0 | 2 | 10 | 0 | 5.30 | 51 |
| Pedro Ortíz | 2020-2034 | .000 | 0 | 0 | 0 | 0 | 10 | 3.93 | 9 |
| Raúl Ortíz | 2024-2032 | .312 | 4 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2022-2031 | .000 | 0 | 0 | 8 | 12 | 22 | 5.48 | 90 |
| Richard Osborn | 2029-2033 | .000 | 0 | 0 | 7 | 8 | 14 | 6.26 | 58 |
| Andrew Osborne | 2015-2016 | .000 | 0 | 0 | 6 | 7 | 0 | 6.25 | 31 |
| Gus Osborne | 2039-2039 | .000 | 0 | 0 | 2 | 11 | 0 | 6.59 | 98 |
| Ken Osborne | 2020-2021 | .283 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Roger Osborne | 2018-2022 | .264 | 11 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Wesley Osborne | 2017-2017 | .233 | 10 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Toyokazu Oshima | 2035-2038 | .238 | 18 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Osmond | 2041-2041 | .316 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2043-2044 | .324 | 8 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Alfred Osuch | 2038-2042 | .000 | 0 | 0 | 13 | 29 | 0 | 5.93 | 194 |
| Yakamochi Ota | 2044-2045 | .267 | 11 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Shohei Otani | 2037-2038 | .325 | 32 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Aldo Ottens | 2038-2047 | .000 | 0 | 0 | 27 | 17 | 0 | 3.38 | 318 |
| Bastien Oudin | 2044-2047 | .243 | 12 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2034-2034 | .000 | 0 | 0 | 3 | 1 | 0 | 3.32 | 22 |
| Matt Ouweneel | 2035-2035 | .250 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| DeMarvion Overshown | 2042-2043 | .277 | 9 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Owens | 2027-2029 | .000 | 0 | 0 | 23 | 20 | 0 | 4.31 | 255 |
| Nolan Owens | 2042-2046 | .000 | 0 | 0 | 1 | 4 | 1 | 6.81 | 38 |
| Ralph Owens | 2042-2045 | .000 | 0 | 0 | 14 | 5 | 2 | 3.58 | 92 |
| Tex Owens | 2044-2044 | .000 | 0 | 0 | 1 | 2 | 0 | 6.88 | 16 |
| Tim Owens | 2039-2047 | .000 | 0 | 0 | 39 | 46 | 0 | 5.33 | 416 |
