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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sifaks Ochieng | 2108-2108 | 0 | 0 | .000 | 20.25 | 2 | 0 | 0 | 0 | 0 | 1.1 | 3 | 3 | 1 | 1 | 1 |
| Ienobu Ohayashi | 2136-2140 | 0 | 1 | .000 | 7.36 | 4 | 0 | 0 | 0 | 0 | 3.2 | 3 | 3 | 0 | 6 | 9 |
| Takao Ohayashi | 2136-2144 | 2 | 0 | 1.000 | 1.77 | 13 | 4 | 0 | 0 | 3 | 20.1 | 11 | 4 | 1 | 5 | 35 |
| Dimas Olival | 2124-2136 | 0 | 2 | .000 | 5.40 | 8 | 5 | 0 | 0 | 0 | 28.1 | 36 | 17 | 4 | 11 | 43 |
| Takiji Ono | 2124-2124 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 1 | 2.0 | 0 | 0 | 0 | 1 | 6 |
| Angus Opie | 2148-2148 | 0 | 0 | .000 | 2.08 | 1 | 0 | 0 | 0 | 0 | 4.1 | 3 | 1 | 0 | 0 | 2 |
| Reþit Orbay | 2120-2120 | 0 | 0 | .000 | 36.00 | 3 | 0 | 0 | 0 | 0 | 2.0 | 8 | 8 | 8 | 2 | 3 |
| Raúl Ordóñez | 2108-2108 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 1 |
| José Ortíz | 2116-2120 | 1 | 1 | .500 | 9.28 | 4 | 1 | 0 | 0 | 0 | 10.2 | 15 | 11 | 8 | 4 | 16 |
| Alfonso Osequedo | 2140-2148 | 0 | 1 | .000 | 5.06 | 4 | 1 | 0 | 0 | 0 | 10.2 | 11 | 6 | 1 | 4 | 10 |
| Senichi Otsuka | 2108-2112 | 0 | 0 | .000 | 3.38 | 6 | 0 | 0 | 0 | 0 | 8.0 | 6 | 3 | 1 | 2 | 6 |
