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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lloyd O'Neal | 2106-2108 | 1 | 0 | 1.000 | 5.79 | 6 | 0 | 0 | 0 | 1 | 14.0 | 17 | 9 | 0 | 7 | 3 |
| Sifaks Ochieng | 2108-2108 | 9 | 6 | .600 | 2.14 | 23 | 23 | 0 | 0 | 0 | 139.0 | 91 | 33 | 8 | 40 | 158 |
| Kisho Ohayashi | 2122-2122 | 4 | 3 | .571 | 3.24 | 33 | 3 | 0 | 0 | 0 | 58.1 | 54 | 21 | 1 | 28 | 44 |
| Takao Ohayashi | 2125-2125 | 1 | 0 | 1.000 | 0.69 | 11 | 0 | 0 | 0 | 8 | 13.0 | 6 | 1 | 0 | 4 | 15 |
| Madidu Olamina | 2127-2128 | 15 | 9 | .625 | 4.44 | 31 | 31 | 4 | 0 | 0 | 196.2 | 232 | 97 | 12 | 35 | 103 |
| Takiji Ono | 2119-2119 | 5 | 3 | .625 | 3.38 | 49 | 0 | 0 | 0 | 6 | 56.0 | 62 | 21 | 1 | 23 | 65 |
| Reþit Orbay | 2116-2116 | 6 | 2 | .750 | 2.35 | 50 | 0 | 0 | 0 | 23 | 53.2 | 38 | 14 | 2 | 25 | 85 |
| Galip Orga | 2102-2102 | 7 | 7 | .500 | 2.18 | 29 | 29 | 0 | 0 | 0 | 132.0 | 118 | 32 | 5 | 44 | 99 |
| Bartolomeo Orlandi | 2127-2128 | 14 | 15 | .483 | 4.04 | 52 | 44 | 0 | 0 | 0 | 267.0 | 237 | 120 | 12 | 106 | 236 |
| Mauro Ortega | 2121-2121 | 3 | 0 | 1.000 | 1.85 | 14 | 0 | 0 | 0 | 0 | 24.1 | 24 | 5 | 1 | 4 | 23 |
| Senichi Otsuka | 2109-2109 | 1 | 0 | 1.000 | 3.86 | 4 | 0 | 0 | 0 | 0 | 7.0 | 8 | 3 | 1 | 1 | 6 |
| Duridar Ottah | 2103-2103 | 6 | 7 | .462 | 3.90 | 33 | 18 | 0 | 0 | 1 | 113.0 | 116 | 49 | 5 | 51 | 63 |
| Ibrahim Ouaziz | 2104-2107 | 8 | 8 | .500 | 3.33 | 127 | 0 | 0 | 0 | 1 | 124.1 | 123 | 46 | 8 | 63 | 121 |
