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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 | 2016-2016 | 3 | 2 | .600 | 4.06 | 7 | 6 | 0 | 0 | 0 | 31.0 | 31 | 14 | 2 | 16 | 27 |
| Ryan O'Rourke | 2014-2022 | 21 | 15 | .583 | 4.80 | 266 | 0 | 0 | 0 | 4 | 369.0 | 377 | 197 | 40 | 176 | 407 |
| Scott Oberg | 2015-2015 | 0 | 0 | .000 | 1.23 | 5 | 0 | 0 | 0 | 0 | 7.1 | 2 | 1 | 0 | 3 | 13 |
| Nate Ocker | 2022-2022 | 2 | 0 | 1.000 | 1.06 | 8 | 0 | 0 | 0 | 0 | 17.0 | 9 | 2 | 0 | 0 | 17 |
| Sarkis Ohanian | 2017-2019 | 2 | 1 | .667 | 2.35 | 19 | 0 | 0 | 0 | 0 | 30.2 | 16 | 8 | 1 | 20 | 33 |
| Jon Olczak | 2018-2021 | 9 | 3 | .750 | 3.74 | 61 | 0 | 0 | 0 | 17 | 96.1 | 84 | 40 | 7 | 34 | 86 |
| Edgar Olmos | 2013-2013 | 3 | 1 | .750 | 4.43 | 8 | 8 | 0 | 0 | 0 | 42.2 | 38 | 21 | 3 | 10 | 35 |
| Ryan Olson | 2018-2019 | 7 | 15 | .318 | 7.95 | 41 | 41 | 0 | 0 | 0 | 171.0 | 221 | 151 | 26 | 142 | 136 |
| Tyler Olson | 2015-2015 | 1 | 3 | .250 | 6.75 | 6 | 6 | 0 | 0 | 0 | 28.0 | 31 | 21 | 3 | 12 | 28 |
| Austin Orewiler | 2019-2020 | 7 | 5 | .583 | 7.24 | 91 | 1 | 0 | 0 | 0 | 115.2 | 153 | 93 | 13 | 82 | 80 |
| Jhailyn Ortiz | 2018-2020 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 3 | 0 |
| J.D. Osborne | 2019-2021 | 0 | 0 | .000 | 36.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 4 | 0 | 5 | 1 |
| Glenn Otto | 2018-2021 | 4 | 7 | .364 | 5.83 | 38 | 27 | 0 | 0 | 3 | 132.2 | 137 | 86 | 16 | 84 | 120 |
| Drake Owenby | 2019-2019 | 2 | 0 | 1.000 | 4.18 | 19 | 7 | 0 | 0 | 0 | 60.1 | 60 | 28 | 9 | 26 | 45 |
| Hagen Owenby | 2018-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 1 | 0 |
| Henry Owens | 2013-2014 | 15 | 8 | .652 | 3.65 | 35 | 33 | 0 | 0 | 0 | 199.2 | 169 | 81 | 19 | 96 | 200 |
