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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 | 2013-2014 | 4 | 6 | .400 | 5.07 | 14 | 12 | 0 | 0 | 0 | 71.0 | 63 | 40 | 5 | 28 | 77 |
| Benjamin O'Shea | 2016-2017 | 1 | 1 | .500 | 4.10 | 20 | 1 | 0 | 0 | 2 | 41.2 | 46 | 19 | 3 | 22 | 40 |
| Bailey Ober | 2018-2018 | 2 | 1 | .667 | 3.18 | 4 | 4 | 0 | 0 | 0 | 22.2 | 19 | 8 | 6 | 9 | 19 |
| Ryan Och | 2022-2022 | 2 | 2 | .500 | 3.13 | 16 | 0 | 0 | 0 | 0 | 23.0 | 19 | 8 | 1 | 13 | 30 |
| Nate Ocker | 2020-2022 | 7 | 4 | .636 | 3.56 | 41 | 0 | 0 | 0 | 20 | 48.0 | 43 | 19 | 4 | 21 | 52 |
| Emilio Ogando | 2022-2022 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 5.1 | 7 | 4 | 1 | 2 | 7 |
| Helcris Olivarez | 2021-2023 | 5 | 8 | .385 | 3.61 | 30 | 30 | 0 | 0 | 0 | 127.0 | 114 | 51 | 13 | 76 | 154 |
| Jared Oliver | 2018-2018 | 0 | 1 | .000 | 6.55 | 4 | 4 | 0 | 0 | 0 | 11.0 | 15 | 8 | 0 | 8 | 12 |
| Braden Olthoff | 2022-2022 | 4 | 2 | .667 | 2.65 | 9 | 9 | 0 | 0 | 0 | 51.0 | 41 | 15 | 2 | 17 | 62 |
| Ben Onyshko | 2020-2023 | 3 | 3 | .500 | 5.69 | 41 | 5 | 0 | 0 | 2 | 49.0 | 64 | 31 | 3 | 29 | 51 |
| Austin Orewiler | 2019-2022 | 8 | 1 | .889 | 1.95 | 45 | 2 | 0 | 0 | 2 | 83.0 | 73 | 18 | 6 | 34 | 79 |
| Robert Orlan | 2019-2019 | 0 | 2 | .000 | 6.35 | 4 | 0 | 0 | 0 | 0 | 5.2 | 6 | 4 | 1 | 3 | 9 |
| Kaleb Ort | 2021-2021 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.2 | 0 | 0 | 0 | 3 | 2 |
| Braulio Ortiz | 2015-2018 | 14 | 6 | .700 | 3.60 | 71 | 17 | 0 | 0 | 6 | 202.1 | 155 | 81 | 9 | 100 | 284 |
| Luis Ortiz | 2015-2015 | 4 | 1 | .800 | 3.66 | 17 | 0 | 0 | 0 | 0 | 32.0 | 25 | 13 | 2 | 23 | 50 |
| Bryce Osmond | 2023-2023 | 1 | 5 | .167 | 5.53 | 15 | 15 | 0 | 0 | 0 | 66.2 | 77 | 41 | 8 | 41 | 80 |
| Michel Otanez | 2022-2022 | 2 | 4 | .333 | 2.92 | 15 | 6 | 0 | 0 | 0 | 40.0 | 30 | 13 | 4 | 26 | 56 |
| Connor Overton | 2021-2021 | 1 | 1 | .500 | 2.42 | 7 | 5 | 0 | 0 | 1 | 26.0 | 24 | 7 | 1 | 8 | 15 |
| David Owen | 2016-2019 | 9 | 1 | .900 | 4.37 | 57 | 0 | 0 | 0 | 4 | 90.2 | 103 | 44 | 8 | 39 | 100 |
| Noah Owen | 2022-2022 | 0 | 2 | .000 | 4.71 | 19 | 0 | 0 | 0 | 0 | 28.2 | 25 | 15 | 5 | 13 | 36 |
| Tyler Owens | 2022-2022 | 0 | 0 | .000 | 2.35 | 5 | 1 | 0 | 0 | 0 | 7.2 | 5 | 2 | 1 | 3 | 8 |
| Billy Oxford | 2019-2022 | 0 | 2 | .000 | 1.98 | 24 | 0 | 0 | 0 | 0 | 41.0 | 37 | 9 | 2 | 16 | 44 |
