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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brennan O'Bannon | 0-2022 | 1 | 2 | .333 | 3.28 | 5 | 5 | 0 | 0 | 0 | 24.2 | 25 | 9 | 0 | 8 | 31 |
| Dale O'Connell | 0-2023 | 5 | 1 | .833 | 1.78 | 29 | 0 | 0 | 0 | 4 | 30.1 | 22 | 6 | 3 | 11 | 35 |
| John O'Connell | 0-2025 | 0 | 1 | .000 | 2.70 | 5 | 5 | 0 | 0 | 0 | 23.1 | 17 | 7 | 1 | 8 | 27 |
| Josh O'Donnell | 0-2021 | 4 | 1 | .800 | 2.33 | 20 | 5 | 0 | 0 | 2 | 46.1 | 28 | 12 | 3 | 18 | 47 |
| Dan O'Grady | -1-2019 | 3 | 6 | .333 | 4.97 | 52 | 8 | 0 | 0 | 11 | 83.1 | 77 | 46 | 14 | 42 | 87 |
| Ross O'Rourke | 0-2020 | 6 | 3 | .667 | 2.73 | 20 | 9 | 0 | 0 | 0 | 66.0 | 53 | 20 | 5 | 18 | 84 |
| Billy Ochoa | 1-2021 | 2 | 3 | .400 | 3.93 | 21 | 2 | 0 | 0 | 1 | 34.1 | 35 | 15 | 1 | 19 | 47 |
| Jesse Odom | 1-2020 | 2 | 2 | .500 | 2.92 | 7 | 7 | 0 | 0 | 0 | 40.0 | 28 | 13 | 3 | 9 | 52 |
| Jamie Offield | 0-2017 | 1 | 0 | 1.000 | 0.00 | 2 | 1 | 0 | 0 | 0 | 6.1 | 1 | 0 | 0 | 1 | 10 |
| David Ogden | 0-2026 | 0 | 2 | .000 | 3.74 | 20 | 1 | 0 | 0 | 1 | 21.2 | 26 | 9 | 0 | 7 | 16 |
| Fadeyka Oistrah | 0-2026 | 5 | 0 | 1.000 | 7.76 | 15 | 0 | 0 | 0 | 0 | 26.2 | 32 | 23 | 4 | 12 | 19 |
| Wei-Tzu Oki | 0-2026 | 2 | 3 | .400 | 6.28 | 38 | 1 | 0 | 0 | 0 | 53.0 | 68 | 37 | 5 | 28 | 50 |
| Shoshi Okuyama | 0-2026 | 5 | 4 | .556 | 6.10 | 14 | 12 | 0 | 0 | 0 | 59.0 | 78 | 40 | 6 | 20 | 51 |
| Martin Olague | 0-6 | 2 | 7 | .222 | 4.87 | 13 | 13 | 0 | 0 | 0 | 57.1 | 68 | 31 | 6 | 20 | 48 |
| Jesus Olavarria | 0-2026 | 2 | 2 | .500 | 1.75 | 9 | 9 | 0 | 0 | 0 | 46.1 | 36 | 9 | 4 | 12 | 51 |
| Miguel Olea | 0-2022 | 7 | 3 | .700 | 2.49 | 14 | 14 | 0 | 0 | 0 | 76.0 | 60 | 21 | 4 | 21 | 99 |
| Tony Olivares | 2-2025 | 21 | 12 | .636 | 3.17 | 109 | 22 | 0 | 0 | 20 | 230.0 | 201 | 81 | 21 | 83 | 244 |
| Willie Olivas | 0-2026 | 3 | 0 | 1.000 | 5.40 | 21 | 0 | 0 | 0 | 2 | 41.2 | 49 | 25 | 4 | 20 | 30 |
| Noah Oliver | 0-2023 | 2 | 3 | .400 | 3.65 | 7 | 7 | 0 | 0 | 0 | 37.0 | 33 | 15 | 3 | 13 | 40 |
| Gary Olsen | -1-2024 | 7 | 8 | .467 | 5.23 | 78 | 1 | 0 | 0 | 6 | 105.0 | 111 | 61 | 16 | 49 | 93 |
| Cory Olson | 1-2016 | 4 | 1 | .800 | 2.36 | 10 | 9 | 0 | 0 | 0 | 49.2 | 31 | 13 | 5 | 10 | 41 |
| Mike Olson | 1-2020 | 3 | 1 | .750 | 1.99 | 33 | 1 | 0 | 0 | 0 | 45.1 | 31 | 10 | 3 | 25 | 58 |
| Katsushi Onishi | 0-2025 | 0 | 1 | .000 | 7.35 | 27 | 0 | 0 | 0 | 2 | 52.2 | 68 | 43 | 5 | 38 | 35 |
| Kazuhiro Ono | 0-2026 | 5 | 5 | .500 | 4.26 | 30 | 8 | 0 | 0 | 3 | 57.0 | 57 | 27 | 4 | 17 | 61 |
| Khaled Onyebuchi | 1-2025 | 5 | 1 | .833 | 3.63 | 17 | 6 | 0 | 0 | 0 | 44.2 | 38 | 18 | 3 | 16 | 45 |
| Mario Orduna | 0-2024 | 0 | 1 | .000 | 1.35 | 10 | 0 | 0 | 0 | 1 | 13.1 | 5 | 2 | 1 | 11 | 11 |
| Heath Orlowski | 0-2026 | 2 | 2 | .500 | 2.68 | 48 | 0 | 0 | 0 | 16 | 40.1 | 42 | 12 | 5 | 13 | 46 |
| Luis Oropeza | 0-2023 | 2 | 1 | .667 | 5.18 | 27 | 0 | 0 | 0 | 1 | 41.2 | 50 | 24 | 7 | 29 | 26 |
| Luis Orta | 0-2025 | 3 | 1 | .750 | 3.18 | 49 | 0 | 0 | 0 | 4 | 56.2 | 46 | 20 | 7 | 19 | 76 |
| Alexis Ortega | 0-10 | 1 | 1 | .500 | 9.00 | 8 | 0 | 0 | 0 | 1 | 14.0 | 19 | 14 | 5 | 7 | 11 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Antonio Ortega | 0-2022 | 1 | 1 | .500 | 10.34 | 11 | 1 | 0 | 0 | 0 | 15.2 | 26 | 18 | 1 | 10 | 14 |
| Nelson Ortiz | 0-6 | 2 | 2 | .500 | 6.10 | 31 | 0 | 0 | 0 | 3 | 48.2 | 60 | 33 | 8 | 23 | 48 |
| Vince Ortiz | 0-2020 | 5 | 2 | .714 | 2.36 | 13 | 13 | 0 | 0 | 0 | 72.1 | 57 | 19 | 3 | 17 | 84 |
| Kanei Osada | 0-0 | 5 | 1 | .833 | 2.57 | 38 | 1 | 0 | 0 | 1 | 70.0 | 59 | 20 | 3 | 21 | 36 |
| Barney Osborne | 0-2026 | 7 | 2 | .778 | 5.20 | 37 | 12 | 0 | 0 | 1 | 79.2 | 94 | 46 | 13 | 22 | 61 |
| John Osborne | 0-2025 | 0 | 0 | .000 | 27.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 3 | 2 | 1 | 1 | 2 |
| Tsuneyoshi Ota | 0-2023 | 7 | 2 | .778 | 1.62 | 41 | 5 | 0 | 0 | 1 | 66.2 | 45 | 12 | 4 | 20 | 58 |
| Emanuel Otero | -1-2023 | 3 | 0 | 1.000 | 3.13 | 41 | 4 | 0 | 0 | 1 | 72.0 | 64 | 25 | 8 | 27 | 76 |
| Nozumo Otsuka | 0-6 | 1 | 2 | .333 | 5.17 | 15 | 0 | 0 | 0 | 2 | 40.0 | 42 | 23 | 2 | 20 | 38 |
| Mike Otto | 0-6 | 1 | 0 | 1.000 | 3.55 | 28 | 0 | 0 | 0 | 1 | 33.0 | 34 | 13 | 2 | 14 | 21 |
| Nelle Oudijk | 0-2024 | 5 | 2 | .714 | 3.67 | 34 | 0 | 0 | 0 | 2 | 56.1 | 59 | 23 | 5 | 18 | 42 |
| Bob Owens | 0-2024 | 0 | 0 | .000 | 1.59 | 6 | 0 | 0 | 0 | 5 | 5.2 | 4 | 1 | 0 | 0 | 7 |
| Justin Owens | 0-2026 | 4 | 4 | .500 | 4.04 | 15 | 13 | 0 | 0 | 0 | 71.1 | 79 | 32 | 6 | 17 | 64 |
