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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chris O'Grady | 2013-2014 | 2 | 1 | .667 | 4.38 | 32 | 0 | 0 | 0 | 3 | 37.0 | 33 | 18 | 2 | 32 | 38 |
| Ryan Och | 2023-2025 | 0 | 1 | .000 | 5.79 | 14 | 0 | 0 | 0 | 0 | 23.1 | 20 | 15 | 4 | 21 | 23 |
| Jacob Odle | 2024-2025 | 1 | 1 | .500 | 12.15 | 20 | 0 | 0 | 0 | 0 | 26.2 | 39 | 36 | 10 | 37 | 33 |
| Jochi Ogando | 2014-2015 | 3 | 3 | .500 | 9.24 | 53 | 0 | 0 | 0 | 0 | 61.1 | 82 | 63 | 8 | 64 | 77 |
| Pierson Ohl | 2023-2023 | 9 | 1 | .900 | 2.64 | 13 | 13 | 0 | 0 | 0 | 85.1 | 58 | 25 | 8 | 24 | 109 |
| Steven Okert | 2013-2014 | 8 | 4 | .667 | 6.41 | 36 | 19 | 0 | 0 | 1 | 106.2 | 113 | 76 | 12 | 69 | 119 |
| Peyton Olejnik | 2026-2026 | 1 | 2 | .333 | 10.61 | 3 | 3 | 0 | 0 | 0 | 9.1 | 11 | 11 | 1 | 14 | 21 |
| Albert Oliva | 2024-2026 | 3 | 0 | 1.000 | 8.15 | 10 | 0 | 0 | 0 | 0 | 17.2 | 19 | 16 | 2 | 26 | 15 |
| Helcris Olivarez | 2022-2024 | 2 | 0 | 1.000 | 3.12 | 7 | 0 | 0 | 0 | 0 | 8.2 | 11 | 3 | 0 | 10 | 13 |
| Connor Oliver | 2024-2025 | 4 | 0 | 1.000 | 6.40 | 19 | 0 | 0 | 0 | 0 | 32.1 | 41 | 23 | 7 | 31 | 38 |
| Bryant Olson | 2025-2025 | 1 | 2 | .333 | 11.68 | 12 | 0 | 0 | 0 | 0 | 12.1 | 18 | 16 | 4 | 12 | 13 |
| J.B. Olson | 2018-2023 | 3 | 4 | .429 | 9.63 | 36 | 0 | 0 | 0 | 0 | 43.0 | 65 | 46 | 13 | 28 | 30 |
| Reese Olson | 2020-2021 | 9 | 3 | .750 | 3.95 | 15 | 15 | 0 | 0 | 0 | 82.0 | 70 | 36 | 13 | 51 | 103 |
| Hunter Omlid | 2026-2026 | 0 | 1 | .000 | 15.19 | 2 | 2 | 0 | 0 | 0 | 5.1 | 10 | 9 | 1 | 9 | 9 |
| Ben Onyshko | 2019-2025 | 4 | 1 | .800 | 4.56 | 14 | 0 | 0 | 0 | 0 | 25.2 | 18 | 13 | 6 | 16 | 40 |
| Christian Oppor | 2024-2025 | 3 | 5 | .375 | 7.18 | 17 | 14 | 0 | 0 | 0 | 52.2 | 47 | 42 | 8 | 64 | 57 |
| Robert Orlan | 2013-2013 | 1 | 0 | 1.000 | 1.93 | 14 | 0 | 0 | 0 | 1 | 14.0 | 16 | 3 | 0 | 4 | 10 |
| Kaleb Ort | 2019-2025 | 8 | 4 | .667 | 6.86 | 69 | 9 | 0 | 0 | 6 | 101.0 | 112 | 77 | 19 | 99 | 113 |
| Braulio Ortiz | 2019-2019 | 0 | 0 | .000 | 4.91 | 13 | 0 | 0 | 0 | 0 | 18.1 | 15 | 10 | 3 | 13 | 23 |
| Braden Osbolt | 2026-2026 | 0 | 1 | .000 | 6.48 | 2 | 2 | 0 | 0 | 0 | 8.1 | 8 | 6 | 1 | 5 | 10 |
| Michel Otanez | 2022-2022 | 0 | 0 | .000 | 3.00 | 2 | 2 | 0 | 0 | 0 | 9.0 | 5 | 3 | 1 | 6 | 16 |
| Andy Otero | 2013-2015 | 7 | 12 | .368 | 7.17 | 42 | 40 | 0 | 0 | 0 | 172.0 | 198 | 137 | 14 | 116 | 207 |
| Micah Ottenbreit | 2024-2026 | 2 | 0 | 1.000 | 6.71 | 21 | 2 | 0 | 0 | 0 | 51.0 | 53 | 38 | 11 | 46 | 59 |
| Riley Ottesen | 2022-2022 | 1 | 2 | .333 | 3.02 | 20 | 20 | 0 | 0 | 0 | 47.2 | 29 | 16 | 3 | 30 | 71 |
| Layonel Ovalles | 2024-2024 | 2 | 4 | .333 | 9.00 | 10 | 10 | 0 | 0 | 0 | 45.0 | 54 | 45 | 12 | 30 | 49 |
| Ariel Ovando | 2016-2016 | 3 | 2 | .600 | 8.68 | 38 | 0 | 0 | 0 | 1 | 18.2 | 32 | 18 | 3 | 22 | 10 |
| Hunter Owen | 2024-2025 | 0 | 0 | .000 | 4.69 | 15 | 0 | 0 | 0 | 4 | 40.1 | 34 | 21 | 5 | 34 | 54 |
| Noah Owen | 2022-2025 | 3 | 2 | .600 | 3.72 | 35 | 4 | 0 | 0 | 0 | 48.1 | 49 | 20 | 6 | 34 | 54 |
| Josh Owens | 2026-2026 | 0 | 1 | .000 | 9.95 | 2 | 2 | 0 | 0 | 0 | 6.1 | 10 | 7 | 0 | 10 | 10 |
| Tyler Owens | 2020-2022 | 2 | 1 | .667 | 1.90 | 9 | 4 | 0 | 0 | 0 | 23.2 | 8 | 5 | 2 | 18 | 29 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Sandy Ozuna | 2026-2026 | 0 | 0 | .000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 2 | 3 | 1 | 3 | 3 |
