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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Connor O'Halloran | 2023-2023 | 3 | 1 | .750 | 6.30 | 6 | 1 | 0 | 0 | 0 | 10.0 | 8 | 7 | 1 | 8 | 9 |
| Jack O'Loughlin | 2024-2024 | 2 | 1 | .667 | 5.51 | 3 | 3 | 0 | 0 | 0 | 16.1 | 18 | 10 | 3 | 14 | 19 |
| Joey Oakie | 2025-2025 | 3 | 5 | .375 | 7.91 | 20 | 20 | 0 | 0 | 0 | 91.0 | 126 | 80 | 22 | 39 | 78 |
| Bailey Ober | 2020-2020 | 7 | 3 | .700 | 2.40 | 18 | 18 | 0 | 0 | 0 | 97.1 | 72 | 26 | 11 | 16 | 110 |
| Wyatt Olds | 2023-2023 | 2 | 4 | .333 | 6.75 | 7 | 7 | 0 | 0 | 0 | 36.0 | 41 | 27 | 7 | 21 | 33 |
| Peyton Olejnik | 2025-2025 | 2 | 14 | .125 | 8.39 | 30 | 23 | 0 | 0 | 4 | 113.2 | 152 | 106 | 24 | 91 | 96 |
| Jose Olivares | 2023-2023 | 3 | 4 | .429 | 6.25 | 21 | 20 | 0 | 0 | 0 | 85.0 | 82 | 59 | 15 | 43 | 83 |
| Jon Olsen | 2022-2025 | 16 | 19 | .457 | 5.80 | 75 | 52 | 0 | 0 | 1 | 339.2 | 409 | 219 | 55 | 162 | 278 |
| J.B. Olson | 2022-2022 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Robert Orlan | 2015-2017 | 7 | 3 | .700 | 4.85 | 51 | 2 | 0 | 0 | 0 | 91.0 | 99 | 49 | 10 | 58 | 83 |
| Jorge Ortega | 2017-2019 | 14 | 5 | .737 | 4.17 | 57 | 14 | 0 | 0 | 4 | 179.0 | 182 | 83 | 25 | 45 | 171 |
| Jesus Ortiz | 2019-2019 | 0 | 0 | .000 | 3.38 | 1 | 0 | 0 | 0 | 0 | 2.2 | 3 | 1 | 1 | 2 | 2 |
| Robinson Ortiz | 2020-2025 | 17 | 11 | .607 | 4.44 | 69 | 33 | 0 | 0 | 2 | 219.0 | 209 | 108 | 35 | 83 | 204 |
| Eric Orze | 2022-2022 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 2 | 0 | 0 | 0 | 5 |
| Michael Osinski | 2019-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 1 | 0 |
| Graham Osman | 2023-2023 | 2 | 0 | 1.000 | 1.12 | 5 | 0 | 0 | 0 | 0 | 8.0 | 3 | 1 | 0 | 5 | 13 |
| Travis Ott | 2015-2021 | 8 | 18 | .308 | 5.67 | 81 | 37 | 0 | 0 | 2 | 243.0 | 269 | 153 | 34 | 128 | 215 |
| Adam Ottavino | 2007-2007 | 12 | 8 | .600 | 3.08 | 27 | 27 | 1 | 0 | 0 | 143.0 | 130 | 49 | 10 | 63 | 128 |
| Layonel Ovalles | 2024-2025 | 3 | 2 | .600 | 4.55 | 16 | 10 | 0 | 0 | 2 | 59.1 | 58 | 30 | 9 | 32 | 61 |
| Johan Oviedo | 2019-2019 | 3 | 8 | .273 | 6.47 | 27 | 27 | 0 | 0 | 0 | 111.1 | 119 | 80 | 13 | 89 | 72 |
| Luis Oviedo | 2019-2023 | 8 | 15 | .348 | 6.47 | 51 | 46 | 0 | 0 | 0 | 204.1 | 239 | 147 | 30 | 112 | 145 |
| Henry Owens | 2018-2018 | 2 | 2 | .500 | 3.63 | 10 | 10 | 0 | 0 | 0 | 44.2 | 41 | 18 | 2 | 30 | 52 |
| Ian Oxnevad | 2018-2020 | 6 | 12 | .333 | 5.18 | 33 | 28 | 0 | 0 | 1 | 156.1 | 174 | 90 | 17 | 64 | 149 |
