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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 | 3-2026 | 19 | 18 | .514 | 4.09 | 94 | 45 | 0 | 0 | 2 | 326.0 | 319 | 148 | 42 | 95 | 296 |
| Jake O'Brien | 0-2024 | 1 | 0 | 1.000 | 2.57 | 1 | 1 | 0 | 0 | 0 | 7.0 | 3 | 2 | 1 | 1 | 7 |
| Dale O'Connell | 4-0 | 17 | 22 | .436 | 3.78 | 63 | 63 | 0 | 0 | 0 | 321.2 | 290 | 135 | 21 | 141 | 338 |
| Josh O'Donnell | 0-2026 | 11 | 2 | .846 | 2.67 | 46 | 11 | 0 | 0 | 2 | 108.0 | 83 | 32 | 3 | 39 | 111 |
| Dan O'Grady | 2-2026 | 11 | 9 | .550 | 3.22 | 59 | 31 | 0 | 0 | 9 | 209.1 | 174 | 75 | 13 | 74 | 198 |
| Greg O'Keefe | 0-3 | 2 | 1 | .667 | 4.15 | 4 | 4 | 0 | 0 | 0 | 21.2 | 20 | 10 | 0 | 8 | 18 |
| Taylor O'Meara | 0-3 | 3 | 5 | .375 | 3.57 | 9 | 9 | 0 | 0 | 0 | 53.0 | 58 | 21 | 4 | 15 | 48 |
| Ross O'Rourke | 0-2025 | 5 | 9 | .357 | 3.30 | 25 | 25 | 0 | 0 | 0 | 144.2 | 125 | 53 | 9 | 39 | 153 |
| Alex Oceguera | 0-4 | 0 | 0 | .000 | 5.87 | 13 | 0 | 0 | 0 | 1 | 23.0 | 28 | 15 | 7 | 11 | 16 |
| Billy Ochoa | 0-2025 | 8 | 2 | .800 | 1.86 | 35 | 8 | 0 | 0 | 0 | 87.0 | 63 | 18 | 1 | 40 | 108 |
| Jamie Offield | 5-2026 | 19 | 10 | .655 | 2.72 | 39 | 39 | 1 | 1 | 0 | 232.0 | 177 | 70 | 18 | 50 | 286 |
| Jung-choon Oh | 0-2026 | 1 | 1 | .500 | 3.24 | 15 | 0 | 0 | 0 | 0 | 8.1 | 6 | 3 | 1 | 6 | 6 |
| Miguel Olea | 0-2024 | 7 | 6 | .538 | 2.15 | 16 | 16 | 0 | 0 | 0 | 100.2 | 69 | 24 | 6 | 35 | 115 |
| Tim Oley | 0-2025 | 0 | 0 | .000 | 2.51 | 2 | 2 | 0 | 0 | 0 | 14.1 | 8 | 4 | 1 | 2 | 11 |
| Joel Oliver | 3-2025 | 21 | 15 | .583 | 2.68 | 56 | 56 | 0 | 0 | 0 | 335.1 | 246 | 100 | 21 | 108 | 376 |
| Noah Oliver | 0-2025 | 1 | 0 | 1.000 | 1.86 | 3 | 3 | 0 | 0 | 0 | 19.1 | 9 | 4 | 2 | 7 | 24 |
| Cory Olson | 0-2024 | 3 | 2 | .600 | 2.12 | 10 | 10 | 0 | 0 | 0 | 59.1 | 43 | 14 | 5 | 21 | 57 |
| Mike Olson | 0-2026 | 2 | 1 | .667 | 2.02 | 47 | 0 | 0 | 0 | 29 | 49.0 | 29 | 11 | 6 | 19 | 59 |
| Jeremy Orejuela | 0-3 | 1 | 3 | .250 | 6.61 | 6 | 6 | 0 | 0 | 0 | 31.1 | 37 | 23 | 6 | 15 | 29 |
| Ryan Orsak | 1-2019 | 3 | 2 | .600 | 2.13 | 40 | 0 | 0 | 0 | 2 | 63.1 | 55 | 15 | 2 | 23 | 68 |
| Antonio Ortega | 1-2026 | 11 | 13 | .458 | 3.65 | 36 | 29 | 1 | 0 | 0 | 177.2 | 157 | 72 | 7 | 66 | 157 |
| Damian Ortega | 0-3 | 6 | 5 | .545 | 3.49 | 66 | 0 | 0 | 0 | 5 | 95.1 | 71 | 37 | 9 | 33 | 106 |
| Erik Ortega | 5-2024 | 22 | 21 | .512 | 3.38 | 65 | 65 | 0 | 0 | 0 | 367.1 | 321 | 138 | 20 | 154 | 433 |
| Vince Ortiz | -1-6 | 9 | 9 | .500 | 4.51 | 104 | 17 | 1 | 0 | 2 | 211.1 | 204 | 106 | 25 | 120 | 202 |
| Mike Osterhout | 2-0 | 0 | 0 | .000 | 4.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 2 | 1 | 0 | 3 | 2 |
| Tsuneyoshi Ota | 0-3 | 6 | 3 | .667 | 3.03 | 41 | 0 | 0 | 0 | 4 | 59.1 | 52 | 20 | 6 | 29 | 62 |
| Joe Owens | 0-2017 | 2 | 0 | 1.000 | 1.85 | 25 | 0 | 0 | 0 | 2 | 24.1 | 17 | 5 | 0 | 12 | 19 |
