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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 |
|---|---|---|---|---|---|---|---|---|---|
| Eric O'Berry | 2016-2019 | .189 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby O'Born | 2016-2016 | .200 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Brien | 2020-2026 | .000 | 0 | 0 | 25 | 27 | 6 | 4.47 | 275 |
| Matt O'Brien | 2026-2026 | .197 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Matt O'Connor | 2020-2026 | .000 | 0 | 0 | 80 | 72 | 11 | 3.25 | 864 |
| Lee O'Hanian | 2016-2026 | .000 | 0 | 0 | 51 | 57 | 295 | 3.00 | 682 |
| Jason O'Keeffe | 2017-2019 | .236 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Leary | 2018-2026 | .243 | 44 | 199 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Leary | 2016-2019 | .000 | 0 | 0 | 15 | 8 | 5 | 4.46 | 164 |
| Tanner O'Malley | 2016-2017 | .206 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Chase O'Neal | 2024-2026 | .206 | 13 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Neil | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 22.50 | 2 |
| Jody O'Neil | 2020-2023 | .198 | 12 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 2016-2022 | .225 | 11 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Ross O'Rourke | 2023-2026 | .000 | 0 | 0 | 4 | 8 | 0 | 4.56 | 72 |
| Chris O'Sullivan | 2019-2019 | .271 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Tey | 2020-2026 | .225 | 92 | 296 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Oakes | 2016-2020 | .000 | 0 | 0 | 13 | 18 | 41 | 3.81 | 232 |
| Dave Oberkrom | 2019-2022 | .229 | 7 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ochoa | 2023-2026 | .000 | 0 | 0 | 18 | 20 | 7 | 4.46 | 281 |
| Mario Ochoa | 2020-2026 | .268 | 108 | 317 | 0 | 0 | 0 | 0.00 | 0 |
| Tae-geun Ock | 2023-2026 | .261 | 21 | 110 | 0 | 0 | 0 | 27.00 | 0 |
| Jesse Odom | 2019-2021 | .000 | 0 | 0 | 1 | 2 | 1 | 5.95 | 33 |
| Jamie Offield | 2022-2026 | .000 | 0 | 0 | 3 | 7 | 0 | 7.71 | 64 |
| Makoto Okamura | 2026-2026 | .083 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Olea | 2025-2026 | .000 | 0 | 0 | 13 | 7 | 0 | 3.61 | 187 |
| Andy Oleksy | 2017-2019 | .000 | 0 | 0 | 3 | 2 | 3 | 7.11 | 50 |
| Tim Oley | 2016-2020 | .000 | 0 | 0 | 25 | 41 | 8 | 4.29 | 329 |
| Isaiah Oliver | 2016-2026 | .254 | 353 | 912 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Oliver | 2024-2026 | .000 | 0 | 0 | 4 | 1 | 4 | 3.83 | 113 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Noah Oliver | 2024-2026 | .000 | 0 | 0 | 16 | 23 | 0 | 4.06 | 449 |
| Alix Ollivier | 2024-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Cory Olson | 2022-2026 | .000 | 0 | 0 | 1 | 3 | 4 | 4.24 | 46 |
| Justin Olson | 2025-2025 | .429 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olson | 2023-2025 | .000 | 0 | 0 | 2 | 2 | 5 | 4.24 | 77 |
| John Olund | 2024-2025 | .667 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| David Openshaw | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Orozco | 2020-2021 | .208 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Orr | 2016-2020 | .221 | 56 | 206 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Orsak | 2016-2020 | .000 | 0 | 0 | 9 | 16 | 0 | 5.20 | 126 |
| Antonio Ortega | 2025-2026 | .000 | 0 | 0 | 5 | 3 | 4 | 3.77 | 90 |
| Erik Ortega | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 3.63 | 11 |
| Melvin Ortiz | 2022-2022 | .188 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Osborne | 2016-2021 | .000 | 0 | 0 | 51 | 56 | 11 | 4.49 | 748 |
| R.J. Oshman | 2016-2017 | .204 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osterhout | 2019-2020 | .250 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Chomei Osumi | 2021-2026 | .260 | 3 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Ottman | 2026-2026 | .167 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ousley | 2023-2024 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Overbey | 2016-2020 | .162 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Overdorff | 2016-2025 | .225 | 68 | 283 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Owens | 2016-2018 | .000 | 0 | 0 | 10 | 6 | 0 | 4.78 | 117 |
| Steve Owens | 2016-2023 | .000 | 0 | 0 | 26 | 45 | 3 | 4.51 | 373 |
