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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Riley O'Brien | 2021-2023 | 3 | 7 | .300 | 2.87 | 111 | 11 | 0 | 0 | 2 | 248.0 | 203 | 79 | 21 | 114 | 255 |
| Darren [UNRATED] O'Day | 2021-2021 | 1 | 0 | 1.000 | 3.27 | 13 | 0 | 0 | 0 | 1 | 11.0 | 11 | 4 | 1 | 5 | 11 |
| Bailey Ober | 2021-2021 | 3 | 2 | .600 | 3.10 | 28 | 0 | 0 | 0 | 4 | 58.0 | 45 | 20 | 9 | 9 | 62 |
| Brett Oberholtzer | 2021-2021 | 1 | 0 | 1.000 | 3.38 | 11 | 0 | 0 | 0 | 1 | 29.1 | 25 | 11 | 6 | 11 | 31 |
| Jake Odorizzi | 2023-2024 | 18 | 9 | .667 | 3.82 | 33 | 33 | 1 | 0 | 0 | 214.2 | 187 | 91 | 23 | 47 | 161 |
| Helcris Olivarez | 2021-2021 | 0 | 0 | .000 | 3.31 | 6 | 0 | 0 | 0 | 0 | 16.1 | 15 | 6 | 3 | 6 | 19 |
| Reese Olson | 2024-2024 | 12 | 7 | .632 | 2.69 | 28 | 28 | 2 | 2 | 0 | 184.1 | 149 | 55 | 12 | 36 | 227 |
| Luis Ortiz | 2023-2024 | 20 | 8 | .714 | 3.81 | 49 | 37 | 0 | 0 | 0 | 255.0 | 239 | 108 | 14 | 78 | 187 |
| Glenn Otto | 2023-2024 | 19 | 10 | .655 | 3.23 | 51 | 51 | 2 | 0 | 0 | 300.2 | 224 | 108 | 21 | 103 | 274 |
| Johan Oviedo | 2021-2023 | 18 | 35 | .340 | 4.93 | 79 | 79 | 0 | 0 | 0 | 429.0 | 440 | 235 | 31 | 213 | 334 |
