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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brennan O'Bannon | 2021-2021 | .000 | 0 | 0 | 1 | 2 | 0 | 3.28 | 31 |
| Matt O'Brien | 2022-2023 | .226 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Dale O'Connell | 2022-2022 | .000 | 0 | 0 | 5 | 1 | 4 | 1.78 | 35 |
| Jim O'Connell | 2016-2023 | .244 | 17 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Connell | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 0 | 2.70 | 27 |
| Darin O'Connor | 2023-2026 | .260 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Mick O'Connor | 2023-2024 | .500 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Josh O'Donnell | 2019-2021 | .000 | 0 | 0 | 4 | 1 | 2 | 2.33 | 47 |
| Dan O'Grady | 2016-2022 | .000 | 0 | 0 | 3 | 6 | 11 | 4.97 | 87 |
| Ryan O'Hearn | 2017-2024 | .227 | 5 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Chase O'Neal | 2021-2021 | .194 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Neal | 2019-2019 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jamal O'Neal | 2023-2026 | .243 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jody O'Neil | 2017-2017 | .248 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Ross O'Rourke | 2018-2019 | .000 | 0 | 0 | 6 | 3 | 0 | 2.73 | 84 |
| Chris O'Sullivan | 2021-2021 | .292 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Ocampo | 2021-2021 | .298 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ochoa | 2020-2021 | .000 | 0 | 0 | 2 | 3 | 1 | 3.93 | 47 |
| Tae-geun Ock | 2019-2020 | .289 | 10 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Anton Octaviano | 2026-2026 | .214 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Odenweller | 2024-2025 | .176 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Odette | 2019-2021 | .241 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Jesse Odom | 2016-2018 | .000 | 0 | 0 | 2 | 2 | 0 | 2.92 | 52 |
| Jamie Offield | 2025-2025 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 10 |
| Aiichiro Ogata | 2021-2025 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tsunesuke Ogawa | 2023-2023 | .231 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| David Ogden | 2024-2024 | .000 | 0 | 0 | 0 | 2 | 1 | 3.74 | 16 |
| Fadeyka Oistrah | 2024-2025 | .000 | 0 | 0 | 5 | 0 | 0 | 7.76 | 19 |
| Joel Ojeda | 2016-2025 | .218 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Okamura | 2023-2025 | .213 | 3 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Wei-Tzu Oki | 2024-2026 | .000 | 0 | 0 | 2 | 3 | 0 | 6.28 | 50 |
| Shoshi Okuyama | 2026-2026 | .000 | 0 | 0 | 5 | 4 | 0 | 6.10 | 51 |
| Martin Olague | 2025-2025 | .000 | 0 | 0 | 2 | 7 | 0 | 4.87 | 48 |
| Jesus Olavarria | 2026-2026 | .000 | 0 | 0 | 2 | 2 | 0 | 1.75 | 51 |
| Miguel Olea | 2022-2022 | .000 | 0 | 0 | 7 | 3 | 0 | 2.49 | 99 |
| Paul Olechowski | 2026-2026 | .260 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Al Olivares | 2025-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Olivares | 2020-2024 | .000 | 0 | 0 | 21 | 12 | 20 | 3.17 | 244 |
| Ernie Olivarez | 2026-2026 | .220 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Olivas | 2019-2020 | .256 | 5 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Olivas | 2021-2026 | .000 | 0 | 0 | 3 | 0 | 2 | 5.40 | 30 |
| Justin Oliver | 2026-2026 | .202 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Noah Oliver | 2022-2023 | .000 | 0 | 0 | 2 | 3 | 0 | 3.65 | 40 |
| Jorge Olivero | 2022-2025 | .165 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Ollila | 2026-2026 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Alix Ollivier | 2018-2019 | .281 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olmstead | 2026-2026 | .196 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Olsen | 2024-2026 | .000 | 0 | 0 | 7 | 8 | 6 | 5.23 | 93 |
| Cory Olson | 2016-2025 | .000 | 0 | 0 | 4 | 1 | 0 | 2.36 | 41 |
| Justin Olson | 2018-2021 | .239 | 13 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olson | 2018-2020 | .000 | 0 | 0 | 3 | 1 | 0 | 1.99 | 58 |
| Robbie Olson | 2024-2026 | .327 | 15 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Habbo Olthoff | 2025-2026 | .181 | 6 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| John Olund | 2018-2020 | .249 | 5 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Olvera | 2024-2026 | .165 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Katsushi Onishi | 2025-2026 | .000 | 0 | 0 | 0 | 1 | 2 | 7.35 | 35 |
| Kazuhiro Ono | 2022-2023 | .000 | 0 | 0 | 5 | 5 | 3 | 4.26 | 61 |
| Khaled Onyebuchi | 2022-2023 | .000 | 0 | 0 | 5 | 1 | 0 | 3.63 | 45 |
| David Openshaw | 2017-2023 | .182 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Vinny Oquendo | 2021-2022 | .209 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Ordonez | 2020-2026 | .246 | 10 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ordonez | 2021-2021 | .205 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Orduna | 2016-2019 | .258 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Orduna | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 1 | 1.35 | 11 |
| Blaine Orea | 2020-2023 | .269 | 12 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Heath Orlowski | 2024-2025 | .000 | 0 | 0 | 2 | 2 | 16 | 2.68 | 46 |
| Shane Orman | 2016-2022 | .231 | 9 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Orman | 2018-2019 | .190 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oropeza | 2024-2025 | .000 | 0 | 0 | 2 | 1 | 1 | 5.18 | 26 |
| Philip Orpen | 2024-2026 | .216 | 2 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Orrostieta | 2024-2025 | .375 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Orta | 2020-2022 | .000 | 0 | 0 | 3 | 1 | 4 | 3.18 | 76 |
| Alexis Ortega | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 1 | 9.00 | 11 |
| Antonio Ortega | 2021-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 10.34 | 14 |
| Bill Ortega | 2023-2026 | .301 | 31 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Ortega | 2023-2026 | .238 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Octavio Ortegon | 2025-2026 | .300 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortiz | 2016-2024 | .230 | 1 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ortiz | 2020-2025 | .350 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortiz | 2022-2023 | .230 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2026-2026 | .232 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortiz | 2026-2026 | .308 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 2024-2026 | .000 | 0 | 0 | 2 | 2 | 3 | 6.10 | 48 |
| Vince Ortiz | 2019-2019 | .000 | 0 | 0 | 5 | 2 | 0 | 2.36 | 84 |
| Flynn Orton | 2021-2023 | .278 | 9 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Kanei Osada | 2025-2026 | .000 | 0 | 0 | 5 | 1 | 1 | 2.57 | 36 |
| Barney Osborne | 2023-2025 | .000 | 0 | 0 | 7 | 2 | 1 | 5.20 | 61 |
| Jacob Osborne | 2025-2026 | .293 | 9 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| John Osborne | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 27.00 | 2 |
| Kevin Osborne | 2025-2026 | .289 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| R.J. Oshman | 2017-2017 | .308 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Ostby | 2017-2019 | .275 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Ostby | 2026-2026 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Allen Ostrom | 2023-2024 | .429 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Chomei Osumi | 2019-2019 | .235 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Kunio Ota | 2022-2025 | .283 | 0 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Sachiko Ota | 2022-2023 | .258 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuneyoshi Ota | 2021-2023 | .000 | 0 | 0 | 7 | 2 | 1 | 1.62 | 58 |
| Emanuel Otero | 2020-2023 | .000 | 0 | 0 | 3 | 0 | 1 | 3.13 | 76 |
| Paul Otero | 2019-2020 | .251 | 8 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Nozumo Otsuka | 2026-2026 | .000 | 0 | 0 | 1 | 2 | 2 | 5.17 | 38 |
| Kevin Ottman | 2025-2025 | .315 | 10 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Otto | 2025-2026 | .000 | 0 | 0 | 1 | 0 | 1 | 3.55 | 21 |
| Nelle Oudijk | 2025-2026 | .000 | 0 | 0 | 5 | 2 | 2 | 3.67 | 42 |
| Mike Ousley | 2016-2019 | .253 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Overbey | 2020-2020 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Overdorff | 2025-2025 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Overend | 2024-2026 | .226 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Overholt | 2024-2026 | .269 | 0 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Owens | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 5 | 1.59 | 7 |
| Chris Owens | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gordie Owens | 2025-2026 | .273 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Owens | 2025-2026 | .260 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Owens | 2025-2026 | .000 | 0 | 0 | 4 | 4 | 0 | 4.04 | 64 |
