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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brian O'Brian | 8-0 | 1 | 0 | 1.000 | 15.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 7 | 5 | 0 | 1 | 0 |
| Paul O'Callahan | 0-0 | 0 | 0 | .000 | 7.31 | 16 | 0 | 0 | 0 | 1 | 28.1 | 36 | 23 | 5 | 17 | 13 |
| Anderson O'Mara | 0-1 | 3 | 7 | .300 | 4.20 | 51 | 0 | 0 | 0 | 3 | 75.0 | 76 | 35 | 11 | 16 | 51 |
| Ron O'Slattery | 0-0 | 1 | 1 | .500 | 9.58 | 4 | 1 | 0 | 0 | 0 | 10.1 | 20 | 11 | 0 | 1 | 4 |
| Jake O'Tomalty | 0-1 | 2 | 2 | .500 | 3.02 | 33 | 0 | 0 | 0 | 2 | 41.2 | 39 | 14 | 5 | 17 | 28 |
| Alin Oanta | 0-2 | 8 | 9 | .471 | 4.95 | 35 | 16 | 0 | 0 | 1 | 100.0 | 97 | 55 | 14 | 51 | 68 |
| Jesús Olvero | -1-2 | 2 | 7 | .222 | 4.23 | 58 | 0 | 0 | 0 | 12 | 78.2 | 71 | 37 | 7 | 49 | 59 |
| Ramón Ortega | 33-1 | 131 | 75 | .636 | 3.19 | 312 | 261 | 39 | 12 | 4 | 1930.0 | 1614 | 684 | 189 | 546 | 1849 |
| Roberto Ortega | 0-0 | 8 | 10 | .444 | 3.26 | 27 | 27 | 3 | 0 | 0 | 190.2 | 190 | 69 | 11 | 31 | 132 |
| José Ortíz | 0-1 | 2 | 4 | .333 | 2.83 | 27 | 0 | 0 | 0 | 5 | 28.2 | 41 | 9 | 4 | 11 | 26 |
| Pedro Ortíz | 8-1 | 29 | 22 | .569 | 3.42 | 83 | 63 | 3 | 0 | 2 | 416.0 | 377 | 158 | 25 | 160 | 337 |
| Vincente Ortíz | -1-1 | 0 | 4 | .000 | 7.88 | 35 | 0 | 0 | 0 | 0 | 53.2 | 68 | 47 | 4 | 45 | 19 |
| Bill Oulton | 12-1 | 65 | 35 | .650 | 2.85 | 134 | 133 | 5 | 0 | 0 | 909.2 | 766 | 288 | 65 | 337 | 728 |
