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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Casey O'Finan | 2146-2148 | 1 | 1 | .500 | 0.93 | 7 | 2 | 0 | 0 | 4 | 19.1 | 7 | 2 | 1 | 3 | 22 |
| Jorge Ocampo | 2143-2146 | 0 | 1 | .000 | 2.25 | 3 | 0 | 0 | 0 | 1 | 4.0 | 3 | 1 | 0 | 2 | 8 |
| Mariano Ochoa | 2141-2148 | 2 | 2 | .500 | 4.87 | 7 | 6 | 0 | 0 | 0 | 40.2 | 40 | 22 | 5 | 12 | 39 |
| Takao Ohayashi | 2127-2135 | 1 | 1 | .500 | 5.23 | 7 | 0 | 0 | 0 | 1 | 10.1 | 11 | 6 | 2 | 3 | 13 |
| Madidu Olamina | 2131-2131 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 3 | 0 | 0 | 1 | 2 |
| Roger Oldford | 2140-2148 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 0 | 0 | 0 | 1 | 4 |
| Dimas Olival | 2127-2133 | 1 | 0 | 1.000 | 1.00 | 2 | 2 | 0 | 0 | 0 | 9.0 | 3 | 1 | 0 | 2 | 5 |
| Kululu Olujimi | 2146-2148 | 0 | 0 | .000 | 2.16 | 3 | 1 | 0 | 0 | 0 | 8.1 | 6 | 2 | 0 | 2 | 7 |
| Takiji Ono | 2125-2132 | 0 | 0 | .000 | 2.25 | 3 | 0 | 0 | 0 | 0 | 4.0 | 3 | 1 | 0 | 3 | 4 |
| Bartolomeo Orlandi | 2133-2135 | 0 | 0 | .000 | 1.08 | 3 | 1 | 0 | 0 | 0 | 8.1 | 5 | 1 | 0 | 4 | 10 |
| Isko Orpilla | 2134-2140 | 0 | 2 | .000 | 3.32 | 4 | 3 | 0 | 0 | 0 | 19.0 | 16 | 7 | 2 | 4 | 22 |
| Alfonso Osequedo | 2147-2147 | 0 | 0 | .000 | 5.79 | 1 | 1 | 0 | 0 | 0 | 4.2 | 10 | 3 | 0 | 0 | 5 |
