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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mikey O'Brien | 2014-2016 | 14 | 13 | .519 | 5.05 | 42 | 42 | 0 | 0 | 0 | 222.2 | 239 | 125 | 29 | 116 | 166 |
| Riley O'Brien | 2021-2025 | 22 | 16 | .579 | 3.99 | 117 | 30 | 0 | 0 | 7 | 317.2 | 282 | 141 | 29 | 182 | 274 |
| Brian O'Keefe | 2020-2022 | 0 | 0 | .000 | 20.25 | 6 | 0 | 0 | 0 | 0 | 4.0 | 8 | 9 | 1 | 9 | 3 |
| Ryan O'Rourke | 2018-2019 | 9 | 5 | .643 | 4.23 | 111 | 0 | 0 | 0 | 2 | 140.1 | 140 | 66 | 13 | 69 | 126 |
| Scott Oberg | 2015-2017 | 10 | 4 | .714 | 4.26 | 91 | 0 | 0 | 0 | 3 | 126.2 | 113 | 60 | 11 | 69 | 131 |
| Aaron Ochsenbein | 2024-2025 | 7 | 4 | .636 | 4.06 | 79 | 0 | 0 | 0 | 4 | 146.1 | 148 | 66 | 21 | 69 | 114 |
| Pierson Ohl | 2025-2025 | 13 | 10 | .565 | 7.57 | 27 | 27 | 0 | 0 | 0 | 151.0 | 221 | 127 | 32 | 43 | 76 |
| Andy Oliver | 2013-2013 | 6 | 2 | .750 | 4.70 | 16 | 16 | 1 | 0 | 0 | 99.2 | 105 | 52 | 12 | 39 | 95 |
| Austin Orewiler | 2018-2018 | 1 | 1 | .500 | 5.04 | 18 | 0 | 0 | 0 | 1 | 30.1 | 38 | 17 | 4 | 20 | 16 |
| Oliver Ortega | 2023-2023 | 1 | 0 | 1.000 | 2.61 | 22 | 0 | 0 | 0 | 2 | 38.0 | 30 | 11 | 4 | 16 | 41 |
| Luis Ortiz | 2021-2025 | 9 | 11 | .450 | 4.21 | 37 | 33 | 0 | 0 | 0 | 184.0 | 197 | 86 | 23 | 78 | 130 |
| Eric Orze | 2024-2025 | 7 | 7 | .500 | 6.88 | 75 | 0 | 0 | 0 | 14 | 87.2 | 90 | 67 | 13 | 67 | 82 |
| Adam Ottavino | 2025-2025 | 0 | 0 | .000 | 4.32 | 7 | 0 | 0 | 0 | 0 | 8.1 | 6 | 4 | 1 | 5 | 11 |
| Glenn Otto | 2019-2025 | 7 | 18 | .280 | 9.33 | 64 | 49 | 0 | 0 | 0 | 183.1 | 238 | 190 | 27 | 174 | 133 |
| Layonel Ovalles | 2025-2025 | 1 | 0 | 1.000 | 3.18 | 1 | 1 | 0 | 0 | 0 | 5.2 | 5 | 2 | 1 | 1 | 7 |
| Connor Overton | 2025-2025 | 0 | 0 | .000 | 12.86 | 2 | 2 | 0 | 0 | 0 | 7.0 | 15 | 10 | 3 | 2 | 11 |
| Drake Owenby | 2019-2019 | 0 | 3 | .000 | 7.14 | 17 | 6 | 0 | 0 | 2 | 40.1 | 59 | 32 | 8 | 22 | 34 |
| Henry Owens | 2014-2014 | 5 | 4 | .556 | 4.15 | 11 | 11 | 0 | 0 | 0 | 65.0 | 53 | 30 | 8 | 26 | 74 |
