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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dave O'Brien | 2029-2030 | .297 | 18 | 143 | 0 | 0 | 0 | 0.00 | 0 |
| Pete O'Bryan | 2019-2020 | .296 | 13 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Nate O'Dell | 2024-2024 | .304 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Alan O'Ferrall | 2025-2027 | .242 | 8 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| James O'Herlihy | 2025-2030 | .268 | 3 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Teddy O'Herlihy | 2020-2020 | .000 | 0 | 0 | 11 | 6 | 0 | 2.95 | 159 |
| Bill O'Neil | 2020-2021 | .297 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Rob O'Quinn | 2017-2019 | .000 | 0 | 0 | 3 | 9 | 63 | 3.35 | 82 |
| Randy Oakley | 2026-2026 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Ocascio | 2023-2023 | .262 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Osamu Ochi | 2023-2023 | .000 | 0 | 0 | 6 | 2 | 4 | 3.27 | 42 |
| Frank Ogrady | 2013-2019 | .000 | 0 | 0 | 21 | 34 | 0 | 5.23 | 185 |
| Eisuke Oike | 2031-2031 | .000 | 0 | 0 | 1 | 0 | 0 | 3.52 | 17 |
| José Ojeda | 2020-2020 | .304 | 19 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Sal Ojeda | 2015-2016 | .000 | 0 | 0 | 10 | 12 | 0 | 5.23 | 103 |
| Kiyoshi Okada | 2031-2031 | .172 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jonas Oleiro | 2021-2021 | .000 | 0 | 0 | 2 | 8 | 0 | 5.90 | 72 |
| Bill Olesen | 2017-2017 | .000 | 0 | 0 | 4 | 7 | 0 | 3.68 | 59 |
| Bartolo Olivarez | 2017-2017 | .000 | 0 | 0 | 16 | 7 | 0 | 3.26 | 182 |
| Esteban Olivas | 2019-2025 | .276 | 14 | 274 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Olivas | 2016-2019 | .000 | 0 | 0 | 18 | 27 | 2 | 3.58 | 241 |
| Salvador Olivas | 2027-2031 | .287 | 27 | 143 | 0 | 0 | 0 | 0.00 | 0 |
| Ezra Olivera | 2013-2015 | .252 | 3 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Fausto Oliveros | 2013-2014 | .249 | 8 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Olivo | 2017-2017 | .259 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Tuan Olmstead | 2014-2014 | .000 | 0 | 0 | 0 | 2 | 0 | 3.66 | 19 |
| Jason Olson | 2031-2031 | .333 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Marty Olson | 2031-2031 | .000 | 0 | 0 | 7 | 3 | 40 | 3.14 | 47 |
| Alfredo Olvera | 2025-2027 | .307 | 9 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Ambroz Ondra | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 2.22 | 17 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Subaru Ono | 2026-2030 | .000 | 0 | 0 | 14 | 18 | 2 | 4.98 | 234 |
| Francisco Orama | 2027-2028 | .263 | 21 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ordóńez | 2015-2015 | .305 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Orme | 2013-2014 | .300 | 10 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Erubiel Ornelas | 2014-2017 | .221 | 27 | 162 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Orosco | 2024-2024 | .000 | 0 | 0 | 11 | 5 | 0 | 3.77 | 142 |
| Armando Ortega | 2019-2020 | .281 | 16 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2027-2030 | .275 | 12 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2025-2026 | .285 | 7 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2025-2025 | .294 | 6 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Claudio Ortega | 2024-2024 | .390 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Diego Ortega | 2020-2024 | .000 | 0 | 0 | 7 | 1 | 7 | 2.89 | 78 |
| Sancho Ortega | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 6.95 | 11 |
| Ángel Ortíz | 2016-2019 | .000 | 0 | 0 | 15 | 9 | 37 | 2.84 | 92 |
| António Ortíz | 2026-2029 | .274 | 20 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ortiz | 2014-2025 | .312 | 8 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Emiliano Ortiz | 2013-2018 | .285 | 8 | 169 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ortíz | 2020-2021 | .211 | 2 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Germán Ortíz | 2028-2031 | .000 | 0 | 0 | 16 | 3 | 4 | 3.13 | 160 |
| Javier Ortíz | 2026-2029 | .314 | 34 | 181 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2021-2026 | .293 | 0 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2026-2029 | .000 | 0 | 0 | 13 | 9 | 7 | 2.76 | 159 |
| Miguel Ortíz | 2025-2031 | .267 | 44 | 301 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2022-2024 | .265 | 17 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2023-2024 | .000 | 0 | 0 | 5 | 6 | 3 | 4.33 | 105 |
| Ricardo Ortíz | 2030-2031 | .259 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortíz | 2019-2021 | .259 | 13 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Osborn | 2029-2031 | .319 | 11 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Osborne | 2023-2027 | .314 | 4 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Yasunobu Ota | 2030-2031 | .000 | 0 | 0 | 12 | 14 | 0 | 5.54 | 190 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Otero | 2022-2024 | .000 | 0 | 0 | 5 | 5 | 2 | 3.23 | 74 |
| Igor Overdevest | 2016-2016 | .289 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Overgaag | 2021-2022 | .277 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Arthur Owens | 2013-2022 | .000 | 0 | 0 | 16 | 8 | 5 | 3.71 | 125 |
| Kaoru Oyama | 2019-2020 | .279 | 4 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Senzo Oyama | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Theodore Ozuna | 2013-2022 | .000 | 0 | 0 | 34 | 44 | 2 | 4.73 | 608 |
