 |
|
|
| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Brennan O'Bannon | 2023-2026 | .000 | 0 | 0 | 19 | 18 | 2 | 4.09 | 296 |
| Eric O'Berry | 2021-2021 | .214 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Brien | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 0 | 2.57 | 7 |
| Matt O'Brien | 2026-2026 | .375 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Dale O'Connell | 2024-2026 | .000 | 0 | 0 | 17 | 22 | 0 | 3.78 | 338 |
| Josh O'Donnell | 2024-2025 | .000 | 0 | 0 | 11 | 2 | 2 | 2.67 | 111 |
| Dan O'Grady | 2020-2023 | .000 | 0 | 0 | 11 | 9 | 9 | 3.22 | 198 |
| Ryan O'Hearn | 2021-2026 | .223 | 9 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Keefe | 2026-2026 | .000 | 0 | 0 | 2 | 1 | 0 | 4.15 | 18 |
| Jason O'Keeffe | 2016-2026 | .220 | 50 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Leary | 2025-2025 | .239 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Taylor O'Meara | 2026-2026 | .000 | 0 | 0 | 3 | 5 | 0 | 3.57 | 48 |
| Chase O'Neal | 2023-2024 | .325 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Neal | 2021-2026 | .200 | 11 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Jody O'Neil | 2024-2026 | .190 | 23 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 2018-2026 | .233 | 20 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Ross O'Rourke | 2020-2021 | .000 | 0 | 0 | 5 | 9 | 0 | 3.30 | 153 |
| Chris O'Sullivan | 2017-2022 | .245 | 13 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Ocampo | 2025-2025 | .281 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Oceguera | 2024-2025 | .000 | 0 | 0 | 0 | 0 | 1 | 5.87 | 16 |
| Billy Ochoa | 2022-2022 | .000 | 0 | 0 | 8 | 2 | 0 | 1.86 | 108 |
| Tae-geun Ock | 2019-2023 | .267 | 7 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Odenweller | 2026-2026 | .192 | 9 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Jamie Offield | 2017-2025 | .000 | 0 | 0 | 19 | 10 | 0 | 2.72 | 286 |
| Aiichiro Ogata | 2019-2019 | .118 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tsunesuke Ogawa | 2024-2026 | .202 | 7 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Jung-choon Oh | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 3.24 | 6 |
| Makoto Okamura | 2026-2026 | .177 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Olea | 2024-2024 | .000 | 0 | 0 | 7 | 6 | 0 | 2.15 | 115 |
| Paul Olechowski | 2026-2026 | .231 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tim Oley | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 2.51 | 11 |
| Roberto Olivas | 2018-2019 | .189 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Oliver | 2021-2023 | .000 | 0 | 0 | 21 | 15 | 0 | 2.68 | 376 |
| Noah Oliver | 2024-2024 | .000 | 0 | 0 | 1 | 0 | 0 | 1.86 | 24 |
| Alix Ollivier | 2023-2023 | .260 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Cory Olson | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 0 | 2.12 | 57 |
| Justin Olson | 2023-2024 | .240 | 11 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olson | 2021-2021 | .000 | 0 | 0 | 2 | 1 | 29 | 2.02 | 59 |
| John Olund | 2023-2024 | .203 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| David Openshaw | 2024-2025 | .253 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordonez | 2019-2019 | .177 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ordonez | 2025-2025 | .194 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Orduna | 2017-2024 | .216 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Blaine Orea | 2026-2026 | .164 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Orejuela | 2025-2026 | .000 | 0 | 0 | 1 | 3 | 0 | 6.61 | 29 |
| Vince Orman | 2021-2023 | .190 | 15 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Orsak | 2022-2024 | .000 | 0 | 0 | 3 | 2 | 2 | 2.13 | 68 |
| Alex Ortega | 2026-2026 | .115 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ortega | 2023-2024 | .000 | 0 | 0 | 11 | 13 | 0 | 3.65 | 157 |
| Damian Ortega | 2025-2026 | .000 | 0 | 0 | 6 | 5 | 5 | 3.49 | 106 |
| Erik Ortega | 2020-2022 | .000 | 0 | 0 | 22 | 21 | 0 | 3.38 | 433 |
| Alex Ortiz | 2025-2026 | .217 | 13 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ortiz | 2023-2026 | .233 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Ortiz | 2016-2024 | .232 | 14 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Ortiz | 2021-2024 | .000 | 0 | 0 | 9 | 9 | 2 | 4.51 | 202 |
| Flynn Orton | 2026-2026 | .303 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Ostby | 2021-2021 | .231 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Ostby | 2026-2026 | .132 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osterhout | 2016-2025 | .245 | 10 | 60 | 0 | 0 | 0 | 4.50 | 2 |
| Chomei Osumi | 2021-2025 | .231 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tsuneyoshi Ota | 2025-2026 | .000 | 0 | 0 | 6 | 3 | 4 | 3.03 | 62 |
| Paul Otero | 2023-2026 | .260 | 22 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ousley | 2021-2024 | .220 | 15 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Overbey | 2018-2023 | .288 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Owens | 2019-2019 | .000 | 0 | 0 | 2 | 0 | 2 | 1.85 | 19 |
