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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jason O'Tomulty | 2126-2127 | 12 | 21 | .364 | 2.86 | 61 | 47 | 1 | 0 | 0 | 327.1 | 298 | 104 | 25 | 103 | 278 |
| Enrique Ocampo | 2113-2117 | 10 | 12 | .455 | 3.86 | 33 | 28 | 1 | 0 | 0 | 195.2 | 199 | 84 | 17 | 69 | 140 |
| Sifaks Ochieng | 2109-2109 | 1 | 0 | 1.000 | 5.40 | 1 | 1 | 0 | 0 | 0 | 5.0 | 5 | 3 | 0 | 5 | 4 |
| Kisho Ohayashi | 2124-2129 | 24 | 36 | .400 | 3.22 | 140 | 57 | 4 | 3 | 23 | 489.0 | 445 | 175 | 36 | 144 | 334 |
| Takao Ohayashi | 2126-2129 | 10 | 5 | .667 | 2.84 | 96 | 1 | 0 | 0 | 31 | 123.2 | 107 | 39 | 1 | 39 | 131 |
| Hagos Ojwang | 2105-2115 | 0 | 0 | .000 | 17.18 | 3 | 0 | 0 | 0 | 0 | 3.2 | 4 | 7 | 0 | 6 | 1 |
| Takiji Ono | 2121-2122 | 6 | 8 | .429 | 3.31 | 70 | 0 | 0 | 0 | 45 | 70.2 | 70 | 26 | 8 | 15 | 101 |
| Pedro Ontiveros | 2114-2121 | 43 | 51 | .457 | 4.08 | 247 | 86 | 4 | 2 | 25 | 781.1 | 867 | 354 | 54 | 267 | 426 |
| Reþit Orbay | 2117-2123 | 19 | 10 | .655 | 3.00 | 122 | 26 | 0 | 0 | 4 | 288.0 | 246 | 96 | 23 | 86 | 295 |
| Raúl Ordóñez | 2104-2108 | 11 | 4 | .733 | 4.09 | 142 | 2 | 0 | 0 | 38 | 180.1 | 184 | 82 | 16 | 63 | 172 |
| Galip Orga | 2104-2104 | 2 | 0 | 1.000 | 0.00 | 28 | 0 | 0 | 0 | 19 | 30.1 | 13 | 0 | 0 | 9 | 28 |
| Bartolomeo Orlandi | 2129-2129 | 2 | 3 | .400 | 4.18 | 9 | 9 | 0 | 0 | 0 | 56.0 | 45 | 26 | 3 | 22 | 48 |
| Mauro Ortega | 2122-2122 | 1 | 2 | .333 | 9.75 | 28 | 0 | 0 | 0 | 0 | 36.0 | 61 | 39 | 1 | 12 | 27 |
| Andrés Ortíz | 2118-2119 | 8 | 11 | .421 | 3.37 | 56 | 29 | 4 | 0 | 2 | 248.1 | 247 | 93 | 15 | 65 | 185 |
| José Ortíz | 2114-2114 | 7 | 12 | .368 | 3.79 | 27 | 27 | 2 | 2 | 0 | 173.1 | 175 | 73 | 13 | 48 | 67 |
| Seika Otani | 2100-2103 | 9 | 8 | .529 | 3.09 | 33 | 33 | 1 | 0 | 0 | 168.2 | 145 | 58 | 11 | 56 | 153 |
| Senichi Otsuka | 2100-2108 | 19 | 15 | .559 | 2.97 | 79 | 43 | 0 | 0 | 11 | 263.2 | 242 | 87 | 19 | 106 | 231 |
| Duridar Ottah | 2106-2110 | 13 | 19 | .406 | 2.97 | 203 | 1 | 0 | 0 | 29 | 227.1 | 194 | 75 | 13 | 62 | 209 |
| Ibrahim Ouaziz | 2105-2112 | 22 | 33 | .400 | 6.01 | 294 | 4 | 0 | 0 | 43 | 479.1 | 584 | 320 | 39 | 254 | 344 |
