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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 | 0 | 1 | .000 | 9.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 5 | 2 | 1 | 2 | 0 |
| Peter O'Brien | 2016-2021 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 0 | 0 | 0 | 3 | 0 |
| Riley O'Brien | 2021-2023 | 3 | 6 | .333 | 5.33 | 31 | 16 | 0 | 0 | 0 | 96.1 | 97 | 57 | 16 | 53 | 94 |
| Darren O'Day | 2013-2022 | 0 | 1 | .000 | 27.00 | 3 | 0 | 0 | 0 | 0 | 1.0 | 3 | 3 | 1 | 0 | 3 |
| Mike O'Reilly | 2019-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.1 | 2 | 0 | 0 | 3 | 1 |
| Ryan O'Rourke | 2018-2018 | 1 | 0 | 1.000 | 5.59 | 9 | 0 | 0 | 0 | 0 | 9.2 | 11 | 6 | 0 | 6 | 11 |
| Trevor Oaks | 2018-2018 | 0 | 1 | .000 | 10.12 | 1 | 1 | 0 | 0 | 0 | 5.1 | 8 | 6 | 3 | 2 | 3 |
| Bailey Ober | 2022-2022 | 4 | 2 | .667 | 4.48 | 9 | 9 | 1 | 0 | 0 | 62.1 | 62 | 31 | 11 | 15 | 54 |
| Scott Oberg | 2016-2016 | 2 | 1 | .667 | 6.35 | 35 | 0 | 0 | 0 | 1 | 51.0 | 62 | 36 | 5 | 43 | 45 |
| Brett Oberholtzer | 2013-2013 | 1 | 0 | 1.000 | 1.04 | 13 | 0 | 0 | 0 | 0 | 17.1 | 16 | 2 | 0 | 6 | 15 |
| David Oca | 2017-2017 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 2 | 0 |
| Alexi Ogando | 2018-2018 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 1 | 1.1 | 1 | 0 | 0 | 1 | 2 |
| Andy Oliver | 2014-2015 | 19 | 25 | .432 | 5.46 | 68 | 66 | 2 | 1 | 1 | 362.1 | 403 | 220 | 45 | 196 | 335 |
| Lester Oliveros | 2013-2015 | 2 | 2 | .500 | 5.09 | 27 | 0 | 0 | 0 | 4 | 35.1 | 40 | 20 | 7 | 21 | 35 |
| Adam Oller | 2022-2023 | 8 | 17 | .320 | 5.64 | 37 | 37 | 0 | 0 | 0 | 222.0 | 240 | 139 | 43 | 98 | 177 |
| Edgar Olmos | 2016-2016 | 6 | 3 | .667 | 4.77 | 53 | 0 | 0 | 0 | 2 | 77.1 | 69 | 41 | 6 | 48 | 56 |
| Reese Olson | 2022-2023 | 5 | 7 | .417 | 5.92 | 17 | 16 | 0 | 0 | 0 | 86.2 | 84 | 57 | 16 | 48 | 60 |
| Tyler Olson | 2018-2020 | 1 | 0 | 1.000 | 4.72 | 22 | 0 | 0 | 0 | 1 | 34.1 | 39 | 18 | 4 | 20 | 41 |
| Logan Ondrusek | 2013-2016 | 11 | 6 | .647 | 3.10 | 138 | 0 | 0 | 0 | 7 | 174.0 | 163 | 60 | 19 | 74 | 171 |
| Austin Orewiler | 2017-2017 | 2 | 0 | 1.000 | 5.94 | 7 | 0 | 0 | 0 | 0 | 16.2 | 17 | 11 | 3 | 17 | 5 |
| Braulio Ortiz | 2019-2019 | 1 | 0 | 1.000 | 10.12 | 5 | 0 | 0 | 0 | 0 | 8.0 | 11 | 9 | 3 | 9 | 4 |
| Luis Ortiz | 2023-2023 | 5 | 4 | .556 | 3.62 | 12 | 12 | 0 | 0 | 0 | 74.2 | 68 | 30 | 7 | 26 | 58 |
| Josh Osich | 2020-2020 | 1 | 2 | .333 | 7.02 | 16 | 0 | 0 | 0 | 0 | 16.2 | 23 | 13 | 3 | 13 | 12 |
| Roberto Osuna | 2017-2018 | 0 | 1 | .000 | 3.38 | 10 | 0 | 0 | 0 | 5 | 8.0 | 7 | 3 | 1 | 1 | 10 |
| Andy Otero | 2022-2022 | 0 | 0 | .000 | 3.00 | 1 | 1 | 0 | 0 | 0 | 6.0 | 4 | 2 | 0 | 3 | 5 |
| Dan Otero | 2013-2016 | 8 | 6 | .571 | 5.55 | 93 | 0 | 0 | 0 | 18 | 94.0 | 107 | 58 | 14 | 29 | 96 |
| Adam Ottavino | 2020-2020 | 1 | 1 | .500 | 18.00 | 3 | 0 | 0 | 0 | 0 | 4.0 | 11 | 8 | 1 | 4 | 3 |
| Glenn Otto | 2019-2023 | 12 | 10 | .545 | 3.84 | 66 | 35 | 1 | 1 | 8 | 243.2 | 231 | 104 | 23 | 109 | 232 |
| Connor Overton | 2023-2023 | 11 | 7 | .611 | 4.91 | 24 | 24 | 1 | 1 | 0 | 139.1 | 152 | 76 | 21 | 44 | 87 |
| Dillon Overton | 2016-2022 | 36 | 35 | .507 | 6.51 | 117 | 107 | 1 | 1 | 0 | 590.1 | 789 | 427 | 111 | 207 | 393 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Henry Owens | 2017-2017 | 0 | 0 | .000 | 4.05 | 1 | 1 | 0 | 0 | 0 | 6.2 | 6 | 3 | 1 | 3 | 6 |
| Rudy Owens | 2013-2014 | 16 | 12 | .571 | 5.30 | 44 | 44 | 1 | 0 | 0 | 248.0 | 291 | 146 | 38 | 57 | 178 |
