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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Brien | 2017-2018 | 8 | 2 | .800 | 3.38 | 39 | 0 | 0 | 0 | 2 | 82.2 | 64 | 31 | 5 | 44 | 108 |
| Colin O'Connell | 2013-2013 | 0 | 0 | .000 | 40.50 | 2 | 0 | 0 | 0 | 0 | 0.2 | 2 | 3 | 0 | 2 | 0 |
| Connor O'Halloran | 2024-2024 | 0 | 0 | .000 | 20.25 | 2 | 0 | 0 | 0 | 0 | 1.1 | 3 | 3 | 2 | 3 | 1 |
| Jack O'Loughlin | 2024-2024 | 0 | 0 | .000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 2 | 0 | 6 | 3 |
| Benjamin O'Shea | 2013-2015 | 2 | 3 | .400 | 8.71 | 51 | 4 | 0 | 0 | 0 | 72.1 | 90 | 70 | 10 | 69 | 83 |
| Joey Oakie | 2025-2025 | 2 | 1 | .667 | 4.56 | 5 | 5 | 0 | 0 | 0 | 23.2 | 20 | 12 | 4 | 7 | 40 |
| Trevor Oaks | 2015-2015 | 0 | 1 | .000 | 16.88 | 3 | 0 | 0 | 0 | 1 | 2.2 | 2 | 5 | 0 | 7 | 8 |
| Scott Oberg | 2013-2013 | 2 | 1 | .667 | 14.73 | 5 | 0 | 0 | 0 | 0 | 3.2 | 5 | 6 | 0 | 7 | 6 |
| David Oca | 2016-2017 | 2 | 8 | .200 | 6.60 | 16 | 16 | 0 | 0 | 0 | 76.1 | 88 | 56 | 11 | 51 | 93 |
| Aaron Ochsenbein | 2022-2023 | 3 | 0 | 1.000 | 3.68 | 11 | 0 | 0 | 0 | 1 | 7.1 | 9 | 3 | 2 | 7 | 8 |
| Nate Ocker | 2021-2021 | 0 | 0 | .000 | 4.56 | 15 | 0 | 0 | 0 | 1 | 23.2 | 17 | 12 | 2 | 13 | 30 |
| Wyatt Olds | 2022-2024 | 1 | 2 | .333 | 13.83 | 10 | 2 | 0 | 0 | 1 | 13.2 | 17 | 21 | 3 | 25 | 16 |
| Mat Olsen | 2022-2025 | 1 | 4 | .200 | 8.74 | 37 | 0 | 0 | 0 | 1 | 57.2 | 77 | 56 | 12 | 45 | 48 |
| Tyler Olson | 2014-2015 | 6 | 1 | .857 | 6.59 | 27 | 0 | 0 | 0 | 1 | 42.1 | 36 | 31 | 4 | 30 | 55 |
| Austin Orewiler | 2017-2022 | 0 | 0 | .000 | 6.55 | 9 | 5 | 0 | 0 | 0 | 22.0 | 29 | 16 | 3 | 18 | 27 |
| Luis Ortiz | 2016-2016 | 1 | 1 | .500 | 5.27 | 18 | 0 | 0 | 0 | 0 | 27.1 | 22 | 16 | 4 | 12 | 48 |
| Robinson Ortiz | 2024-2024 | 0 | 1 | .000 | 9.90 | 6 | 0 | 0 | 0 | 0 | 10.0 | 12 | 11 | 3 | 9 | 15 |
| Eric Orze | 2023-2023 | 1 | 1 | .500 | 7.71 | 5 | 0 | 0 | 0 | 0 | 7.0 | 9 | 6 | 2 | 7 | 7 |
| Daniel Ouderkirk | 2025-2025 | 0 | 0 | .000 | 4.76 | 8 | 0 | 0 | 0 | 0 | 11.1 | 10 | 6 | 2 | 9 | 22 |
| Dillon Overton | 2014-2014 | 3 | 1 | .750 | 4.22 | 6 | 6 | 0 | 0 | 0 | 32.0 | 31 | 15 | 3 | 15 | 36 |
| Andrew Owen | 2023-2025 | 7 | 3 | .700 | 7.84 | 34 | 14 | 0 | 0 | 0 | 98.2 | 99 | 86 | 24 | 90 | 134 |
| David Owen | 2017-2018 | 2 | 1 | .667 | 12.33 | 27 | 0 | 0 | 0 | 0 | 30.2 | 53 | 42 | 9 | 44 | 23 |
| Drake Owenby | 2016-2018 | 4 | 5 | .444 | 4.40 | 25 | 20 | 0 | 0 | 0 | 102.1 | 98 | 50 | 11 | 53 | 139 |
| Billy Oxford | 2018-2022 | 4 | 5 | .444 | 4.52 | 43 | 6 | 0 | 0 | 8 | 83.2 | 67 | 42 | 11 | 68 | 117 |
| Ian Oxnevad | 2016-2017 | 2 | 3 | .400 | 6.75 | 28 | 4 | 0 | 0 | 0 | 57.1 | 64 | 43 | 5 | 51 | 72 |
