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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 |
|---|---|---|---|---|---|---|---|---|---|
| Scott O'Connor | 2026-2027 | .231 | 10 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Day | 2018-2028 | .000 | 0 | 0 | 157 | 83 | 0 | 3.93 | 2088 |
| Adam O'Dell | 2025-2028 | .202 | 19 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Doherty | 2023-2025 | .241 | 8 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Reese O'Donnell | 2017-2019 | .222 | 5 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Farrell | 2027-2028 | .321 | 32 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Farrell | 2020-2023 | .000 | 0 | 0 | 8 | 5 | 2 | 5.53 | 115 |
| Steve O'Farrell | 2024-2024 | .114 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Reese O'Higgins | 2015-2022 | .288 | 8 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Neal | 2012-2021 | .306 | 71 | 443 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2016-2028 | .000 | 0 | 0 | 42 | 55 | 107 | 4.65 | 836 |
| Mark O'Neil | 2021-2028 | .323 | 145 | 503 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Quinn | 2017-2022 | .000 | 0 | 0 | 50 | 67 | 0 | 5.44 | 640 |
| Roy O'Quinn | 2013-2019 | .236 | 95 | 282 | 0 | 0 | 0 | 0.00 | 0 |
| Foster O'Reilly | 2013-2023 | .262 | 4 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Gene O'Reilly | 2012-2019 | .250 | 85 | 331 | 0 | 0 | 0 | 0.00 | 0 |
| John Oakes | 2027-2028 | .284 | 35 | 166 | 0 | 0 | 0 | 0.00 | 0 |
| Anastasio Ocampo | 2028-2028 | .171 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| José Ochoa | 2018-2028 | .000 | 0 | 0 | 35 | 35 | 38 | 5.07 | 620 |
| León Oditón | 2012-2022 | .275 | 167 | 695 | 0 | 0 | 0 | 0.00 | 0 |
| Hidehira Ogawa | 2022-2022 | .216 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tomohiko Ogawa | 2023-2028 | .240 | 5 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oglethorpe | 2017-2026 | .318 | 137 | 571 | 0 | 0 | 0 | 0.00 | 0 |
| Jun'ichi Ogura | 2015-2018 | .272 | 2 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Nobukazu Ogura | 2024-2024 | .253 | 4 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Hidehira Ohayashi | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2021-2022 | .000 | 0 | 0 | 0 | 0 | 1 | 3.57 | 12 |
| Tatsukichi Ohayashi | 2019-2019 | .225 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Keitaro Ojima | 2020-2028 | .262 | 117 | 381 | 0 | 0 | 0 | 0.00 | 0 |
| Takiji Ojima | 2021-2023 | .221 | 22 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Yoshino Okabe | 2019-2025 | .245 | 27 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Masayuki Okada | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 11.88 | 5 |
| Izumo Okumura | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 8.44 | 20 |
| Jeff Olsen | 2014-2016 | .000 | 0 | 0 | 31 | 32 | 1 | 5.10 | 235 |
| Dave Olson | 2012-2016 | .294 | 30 | 206 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Omori | 2018-2028 | .267 | 10 | 186 | 0 | 0 | 0 | 0.00 | 0 |
| Chong-Duy Ong | 2025-2027 | .300 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Onishi | 2017-2024 | .000 | 0 | 0 | 20 | 20 | 6 | 5.53 | 354 |
| Takao Onishi | 2018-2022 | .000 | 0 | 0 | 0 | 7 | 0 | 6.84 | 26 |
| Yasujiro Ono | 2017-2028 | .000 | 0 | 0 | 37 | 31 | 65 | 4.40 | 707 |
| Ramon Ooyendijk | 2026-2028 | .308 | 33 | 157 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oram | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 1.69 | 4 |
| Giuseppe Orati | 2027-2028 | .000 | 0 | 0 | 1 | 0 | 0 | 4.05 | 20 |
| Pedro Ornelas | 2015-2017 | .244 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Orozco | 2022-2027 | .272 | 42 | 158 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortega | 2020-2026 | .266 | 2 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Ramiro Ortega | 2012-2028 | .000 | 0 | 0 | 71 | 78 | 50 | 4.72 | 1088 |
| Adrián Ortíz | 2018-2023 | .294 | 39 | 256 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 2025-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Ortíz | 2021-2024 | .000 | 0 | 0 | 4 | 6 | 2 | 4.50 | 104 |
| Javier Ortíz | 2026-2028 | .229 | 32 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2021-2026 | .000 | 0 | 0 | 25 | 17 | 36 | 4.53 | 323 |
| Jorge Ortíz | 2019-2028 | .000 | 0 | 0 | 71 | 63 | 3 | 5.12 | 1116 |
| Juan Ortíz | 2024-2026 | .235 | 16 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Carlos Ortíz | 2016-2020 | .289 | 5 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortíz | 2024-2025 | .267 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ortíz | 2020-2025 | .239 | 38 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 11.00 | 6 |
| Don Orton | 2023-2028 | .306 | 18 | 200 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osborn | 2019-2019 | .314 | 1 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Robert Osborne | 2016-2018 | .000 | 0 | 0 | 18 | 30 | 0 | 5.63 | 264 |
| Joe Osler | 2027-2028 | .247 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ospira | 2019-2028 | .276 | 37 | 251 | 0 | 0 | 0 | 0.00 | 0 |
| Sal Ostendorff | 2021-2028 | .304 | 201 | 629 | 0 | 0 | 0 | 0.00 | 0 |
| Eisuke Ota | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 1.83 | 10 |
| Fernando Otero | 2026-2026 | .000 | 0 | 0 | 2 | 5 | 1 | 6.04 | 27 |
| Vicente Otero | 2020-2028 | .000 | 0 | 0 | 19 | 24 | 28 | 4.61 | 391 |
| Woody Owen | 2017-2024 | .000 | 0 | 0 | 61 | 57 | 5 | 5.86 | 694 |
| Dominic Owens | 2021-2027 | .309 | 11 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob Owens | 2022-2023 | .000 | 0 | 0 | 1 | 4 | 1 | 5.85 | 46 |
| Tom Owens | 2012-2022 | .000 | 0 | 0 | 87 | 103 | 7 | 4.38 | 1070 |
| Tom Owens | 2013-2028 | .000 | 0 | 0 | 129 | 141 | 9 | 5.01 | 1611 |
| Kichibei Ozawa | 2026-2027 | .000 | 0 | 0 | 8 | 13 | 4 | 5.11 | 123 |
