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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 | 2024-2026 | .000 | 0 | 0 | 4 | 1 | 0 | 4.10 | 59 |
| Eric O'Berry | 2016-2022 | .242 | 26 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Brien | 2019-2024 | .000 | 0 | 0 | 9 | 6 | 0 | 2.13 | 140 |
| Matt O'Brien | 2026-2026 | .256 | 5 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Dale O'Connell | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 0 |
| Matt O'Connor | 2016-2019 | .000 | 0 | 0 | 0 | 0 | 3 | 4.80 | 14 |
| Josh O'Donnell | 2025-2026 | .000 | 0 | 0 | 13 | 11 | 8 | 3.46 | 142 |
| Dan O'Grady | 2020-2026 | .000 | 0 | 0 | 23 | 27 | 49 | 3.63 | 354 |
| Ryan O'Hearn | 2022-2024 | .244 | 3 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Keeffe | 2016-2026 | .229 | 82 | 215 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Leary | 2018-2026 | .229 | 51 | 212 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Leary | 2020-2025 | .000 | 0 | 0 | 20 | 16 | 28 | 3.28 | 296 |
| Chase O'Neal | 2024-2026 | .224 | 36 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Neal | 2023-2025 | .168 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Neil | 2016-2021 | .000 | 0 | 0 | 43 | 49 | 1 | 3.83 | 717 |
| Jody O'Neil | 2020-2026 | .223 | 23 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 2016-2026 | .255 | 41 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Ross O'Rourke | 2022-2025 | .000 | 0 | 0 | 34 | 29 | 0 | 3.70 | 414 |
| Chris O'Sullivan | 2016-2022 | .265 | 18 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Tey | 2020-2026 | .311 | 18 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Oakes | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 1 | 7.04 | 5 |
| Dave Oberkrom | 2016-2023 | .235 | 22 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ochoa | 2023-2025 | .000 | 0 | 0 | 9 | 8 | 0 | 3.75 | 140 |
| Mario Ochoa | 2020-2023 | .310 | 6 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Tae-geun Ock | 2023-2026 | .309 | 12 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Jesse Odom | 2016-2020 | .000 | 0 | 0 | 27 | 22 | 2 | 3.86 | 392 |
| Jamie Offield | 2018-2026 | .000 | 0 | 0 | 51 | 47 | 7 | 3.53 | 852 |
| Tsunesuke Ogawa | 2025-2026 | .234 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jung-choon Oh | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 2.70 | 7 |
| Miguel Olea | 2024-2025 | .000 | 0 | 0 | 10 | 13 | 0 | 3.62 | 229 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Paul Olechowski | 2026-2026 | .245 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oleksy | 2016-2019 | .000 | 0 | 0 | 5 | 10 | 1 | 4.28 | 105 |
| Tim Oley | 2021-2025 | .000 | 0 | 0 | 30 | 20 | 7 | 3.32 | 329 |
| Tony Olivares | 2026-2026 | .000 | 0 | 0 | 7 | 4 | 0 | 3.16 | 53 |
| Ernie Olivarez | 2026-2026 | .056 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Isaiah Oliver | 2024-2024 | .235 | 2 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Oliver | 2023-2026 | .000 | 0 | 0 | 2 | 7 | 35 | 2.87 | 109 |
| Noah Oliver | 2024-2025 | .000 | 0 | 0 | 0 | 3 | 0 | 3.52 | 49 |
| Alix Ollivier | 2023-2025 | .227 | 21 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Cory Olson | 2020-2026 | .000 | 0 | 0 | 45 | 42 | 22 | 3.80 | 714 |
| Justin Olson | 2024-2026 | .205 | 13 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olson | 2018-2026 | .000 | 0 | 0 | 18 | 20 | 72 | 2.64 | 303 |
| John Olund | 2024-2026 | .232 | 12 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| David Openshaw | 2024-2025 | .185 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Orduna | 2017-2024 | .128 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Orman | 2023-2024 | .220 | 10 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Orozco | 2018-2022 | .263 | 56 | 236 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Orsak | 2016-2024 | .000 | 0 | 0 | 43 | 29 | 8 | 3.57 | 661 |
| Erik Ortega | 2019-2024 | .000 | 0 | 0 | 3 | 2 | 0 | 4.74 | 40 |
| Melvin Ortiz | 2018-2023 | .256 | 34 | 152 | 0 | 0 | 0 | 0.00 | 0 |
| R.J. Oshman | 2017-2017 | .255 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Ostby | 2026-2026 | .236 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osterhout | 2016-2023 | .265 | 69 | 261 | 0 | 0 | 0 | 0.00 | 0 |
| Chomei Osumi | 2022-2024 | .259 | 2 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Otero | 2025-2026 | .191 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ousley | 2021-2024 | .248 | 11 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Overbey | 2016-2023 | .275 | 13 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Overdorff | 2018-2025 | .217 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Owens | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 7.20 | 2 |
| Steve Owens | 2016-2023 | .000 | 0 | 0 | 18 | 19 | 9 | 3.02 | 270 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
