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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 | 2021-2023 | 19 | 9 | .679 | 3.61 | 63 | 26 | 0 | 0 | 1 | 214.2 | 197 | 86 | 15 | 123 | 184 |
| 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 |
| Jon Olczak | 2018-2023 | 11 | 4 | .733 | 4.40 | 131 | 0 | 0 | 0 | 21 | 165.2 | 167 | 81 | 21 | 58 | 126 |
| Andy Oliver | 2013-2013 | 6 | 2 | .750 | 4.70 | 16 | 16 | 1 | 0 | 0 | 99.2 | 105 | 52 | 12 | 39 | 95 |
| Ryan Olson | 2019-2023 | 11 | 16 | .407 | 4.84 | 91 | 27 | 0 | 0 | 1 | 258.2 | 292 | 139 | 37 | 111 | 184 |
| 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 | 2021-2022 | 8 | 11 | .421 | 4.35 | 32 | 32 | 0 | 0 | 0 | 167.2 | 185 | 81 | 20 | 71 | 116 |
| Glenn Otto | 2019-2020 | 5 | 17 | .227 | 9.28 | 50 | 48 | 0 | 0 | 0 | 150.1 | 192 | 155 | 23 | 148 | 98 |
| 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 |
