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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 | 2028-2028 | .333 | 10 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Pat O'Brien | 2030-2031 | .000 | 0 | 0 | 7 | 7 | 1 | 5.61 | 81 |
| Pete O'Bryan | 2018-2024 | .242 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Jeffery O'Callan | 2022-2024 | .366 | 2 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Kent O'Connor | 2021-2022 | .250 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Nate O'Dell | 2023-2023 | .314 | 5 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| James O'Herlihy | 2024-2026 | .326 | 2 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Teddy O'Herlihy | 2019-2019 | .000 | 0 | 0 | 14 | 6 | 0 | 3.03 | 107 |
| Artie O'Neal | 2030-2031 | .224 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Neil | 2019-2020 | .282 | 6 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin O'Quinn | 2031-2031 | .286 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Rob O'Quinn | 2015-2016 | .000 | 0 | 0 | 2 | 3 | 28 | 2.25 | 39 |
| Luther O'Rorke | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Randy Oakley | 2024-2027 | .200 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ocampo | 2027-2030 | .000 | 0 | 0 | 8 | 3 | 0 | 4.86 | 65 |
| Mauro Ocascio | 2021-2023 | .219 | 7 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Osamu Ochi | 2019-2022 | .000 | 0 | 0 | 11 | 12 | 65 | 3.45 | 98 |
| Ernesto Ochoa | 2030-2031 | .000 | 0 | 0 | 3 | 4 | 3 | 4.13 | 61 |
| Frank Ogrady | 2013-2016 | .000 | 0 | 0 | 13 | 6 | 1 | 2.79 | 94 |
| Masakazu Ohayashi | 2021-2025 | .205 | 4 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Eisuke Oike | 2031-2031 | .000 | 0 | 0 | 8 | 7 | 0 | 2.61 | 127 |
| Sal Ojeda | 2013-2019 | .000 | 0 | 0 | 3 | 3 | 1 | 1.99 | 43 |
| Kiyoshi Okada | 2031-2031 | .311 | 1 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Jonas Oleiro | 2019-2027 | .000 | 0 | 0 | 20 | 20 | 0 | 5.13 | 192 |
| Bill Olesen | 2017-2017 | .000 | 0 | 0 | 9 | 0 | 0 | 2.27 | 65 |
| Andrés Oliva | 2026-2026 | .231 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olivares | 2018-2019 | .000 | 0 | 0 | 11 | 13 | 0 | 3.71 | 98 |
| Bartolo Olivarez | 2014-2016 | .000 | 0 | 0 | 23 | 40 | 0 | 3.49 | 253 |
| Adrián Olivas | 2031-2031 | .286 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Olivas | 2016-2018 | .308 | 0 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Javier Olivas | 2014-2015 | .000 | 0 | 0 | 13 | 10 | 0 | 3.23 | 90 |
| Salvador Olivas | 2024-2030 | .255 | 12 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Olivencio | 2030-2031 | .274 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Oliver | 2019-2021 | .222 | 2 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Fausto Oliveros | 2014-2014 | .282 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Olivo | 2016-2016 | .263 | 7 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Olson | 2029-2030 | .150 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Marty Olson | 2029-2030 | .000 | 0 | 0 | 4 | 16 | 26 | 2.95 | 74 |
| Michael Olson | 2016-2022 | .297 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Olson | 2025-2025 | .000 | 0 | 0 | 7 | 11 | 0 | 3.69 | 108 |
| Alfredo Olvera | 2024-2025 | .285 | 3 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Subaru Ono | 2026-2026 | .000 | 0 | 0 | 10 | 5 | 0 | 3.91 | 92 |
| Roberto Ontiveros | 2027-2029 | .000 | 0 | 0 | 3 | 7 | 3 | 4.26 | 65 |
| Francisco Orama | 2024-2026 | .261 | 22 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ordóńez | 2014-2015 | .296 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Ordóńez | 2021-2028 | .209 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Erubiel Ornelas | 2013-2013 | .273 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Orosco | 2022-2024 | .000 | 0 | 0 | 3 | 2 | 5 | 1.91 | 25 |
| Don Orr | 2018-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 1.02 | 14 |
| Armando Ortega | 2017-2018 | .271 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2026-2026 | .269 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2024-2024 | .364 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2024-2024 | .276 | 6 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Claudio Ortega | 2022-2023 | .360 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Diego Ortega | 2018-2019 | .000 | 0 | 0 | 3 | 2 | 0 | 3.93 | 45 |
| Francisco Ortega | 2027-2028 | .000 | 0 | 0 | 6 | 4 | 6 | 6.53 | 63 |
| José Ortega | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 9 |
| Sancho Ortega | 2030-2031 | .000 | 0 | 0 | 5 | 0 | 3 | 2.43 | 105 |
| Álex Ortíz | 2030-2031 | .237 | 5 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2026-2029 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| António Ortíz | 2023-2026 | .265 | 6 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ortiz | 2013-2025 | .289 | 8 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ortíz | 2018-2018 | .268 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Germán Ortíz | 2026-2027 | .000 | 0 | 0 | 1 | 1 | 0 | 2.28 | 68 |
| Javier Ortíz | 2025-2026 | .289 | 10 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2019-2020 | .221 | 12 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2019-2020 | .296 | 1 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2024-2026 | .000 | 0 | 0 | 4 | 3 | 3 | 4.09 | 55 |
| Miguel Ortíz | 2030-2031 | .000 | 0 | 0 | 8 | 4 | 4 | 3.43 | 200 |
| Miguel Ortíz | 2024-2029 | .212 | 18 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2020-2023 | .344 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2019-2023 | .000 | 0 | 0 | 11 | 5 | 1 | 2.72 | 103 |
| Pancho Ortíz | 2016-2016 | .244 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortíz | 2017-2020 | .000 | 0 | 0 | 3 | 0 | 3 | 5.86 | 47 |
| Ricardo Ortíz | 2029-2031 | .303 | 1 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Osborn | 2028-2029 | .300 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Osborne | 2022-2027 | .281 | 2 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Alfonso Osorio | 2031-2031 | .227 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Yasunobu Ota | 2029-2029 | .000 | 0 | 0 | 8 | 5 | 0 | 3.29 | 101 |
| Juan Otero | 2017-2020 | .000 | 0 | 0 | 4 | 0 | 6 | 1.88 | 37 |
| Igor Overdevest | 2014-2016 | .239 | 3 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Overgaag | 2020-2020 | .251 | 4 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Roger Owens | 2020-2023 | .000 | 0 | 0 | 3 | 4 | 0 | 3.61 | 7 |
| Kaoru Oyama | 2016-2025 | .307 | 0 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Senzo Oyama | 2024-2025 | .376 | 4 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Theodore Ozuna | 2015-2015 | .000 | 0 | 0 | 5 | 3 | 0 | 2.28 | 70 |
