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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steven O'connor | 2144-2144 | 10 | 10 | .500 | 3.28 | 28 | 28 | 0 | 0 | 0 | 170.0 | 132 | 62 | 6 | 83 | 171 |
| Brent O'Monahan | 2102-2104 | 17 | 5 | .773 | 1.96 | 80 | 14 | 0 | 0 | 35 | 170.0 | 113 | 37 | 10 | 52 | 169 |
| Jason O'Tomulty | 2123-2124 | 12 | 9 | .571 | 3.41 | 33 | 33 | 1 | 1 | 0 | 203.1 | 187 | 77 | 10 | 78 | 187 |
| Enrique Ocampo | 2107-2109 | 20 | 18 | .526 | 3.05 | 58 | 52 | 3 | 2 | 0 | 345.0 | 305 | 117 | 26 | 106 | 262 |
| Sifaks Ochieng | 2109-2109 | 4 | 0 | 1.000 | 4.87 | 7 | 7 | 0 | 0 | 0 | 40.2 | 39 | 22 | 3 | 10 | 46 |
| Mariano Ochoa | 2141-2141 | 5 | 6 | .455 | 2.84 | 14 | 14 | 0 | 0 | 0 | 101.1 | 75 | 32 | 5 | 27 | 75 |
| Kikpurui Odhieng | 2142-2142 | 2 | 4 | .333 | 3.06 | 37 | 0 | 0 | 0 | 0 | 50.0 | 44 | 17 | 0 | 26 | 42 |
| Ienobu Ohayashi | 2134-2141 | 28 | 12 | .700 | 2.27 | 56 | 56 | 6 | 3 | 0 | 393.1 | 283 | 99 | 21 | 104 | 388 |
| Shoichi Okubo | 2143-2146 | 5 | 12 | .294 | 5.02 | 58 | 26 | 0 | 0 | 0 | 152.1 | 144 | 85 | 10 | 96 | 127 |
| Madidu Olamina | 2130-2133 | 15 | 15 | .500 | 3.39 | 38 | 38 | 4 | 4 | 0 | 263.0 | 278 | 99 | 14 | 42 | 186 |
| Roger Oldford | 2138-2138 | 5 | 10 | .333 | 3.94 | 59 | 0 | 0 | 0 | 31 | 64.0 | 74 | 28 | 5 | 22 | 65 |
| Carlos Oliva | 2143-2143 | 1 | 4 | .200 | 4.83 | 46 | 0 | 0 | 0 | 2 | 59.2 | 60 | 32 | 5 | 34 | 44 |
| Dimas Olival | 2120-2140 | 15 | 21 | .417 | 4.10 | 50 | 50 | 2 | 1 | 0 | 283.0 | 329 | 129 | 9 | 87 | 120 |
| Jesús Oliveira | 2104-2108 | 12 | 27 | .308 | 6.38 | 57 | 50 | 14 | 2 | 0 | 288.0 | 324 | 204 | 9 | 161 | 200 |
| Marçall Olmpio | 2102-2106 | 15 | 9 | .625 | 3.13 | 86 | 31 | 0 | 0 | 6 | 241.1 | 215 | 84 | 13 | 88 | 189 |
| Kululu Olujimi | 2138-2138 | 17 | 5 | .773 | 2.64 | 25 | 25 | 0 | 0 | 0 | 177.1 | 154 | 52 | 12 | 38 | 139 |
| Alfredo Olvera | 2118-2118 | 7 | 10 | .412 | 4.09 | 33 | 23 | 1 | 1 | 0 | 156.1 | 164 | 71 | 9 | 70 | 123 |
| Fath Omar | 2137-2140 | 39 | 38 | .506 | 3.17 | 99 | 99 | 6 | 5 | 0 | 648.1 | 563 | 228 | 31 | 216 | 541 |
| Tekeste Omitra | 2144-2145 | 5 | 2 | .714 | 3.49 | 70 | 0 | 0 | 0 | 1 | 56.2 | 41 | 22 | 3 | 36 | 67 |
| Miguel Ondonez | 2115-2116 | 3 | 9 | .250 | 3.08 | 95 | 0 | 0 | 0 | 52 | 96.1 | 88 | 33 | 4 | 59 | 127 |
| Angus Opie | 2145-2145 | 8 | 9 | .471 | 2.97 | 28 | 23 | 2 | 1 | 0 | 157.2 | 155 | 52 | 5 | 25 | 102 |
| Reþit Orbay | 2124-2131 | 17 | 10 | .630 | 2.71 | 140 | 30 | 0 | 0 | 6 | 348.2 | 281 | 105 | 21 | 70 | 386 |
| Isko Orpilla | 2130-2130 | 3 | 15 | .167 | 7.24 | 23 | 23 | 0 | 0 | 0 | 115.2 | 162 | 93 | 11 | 64 | 34 |
| Mauro Ortega | 2119-2124 | 7 | 14 | .333 | 2.49 | 136 | 1 | 0 | 0 | 57 | 152.0 | 145 | 42 | 5 | 48 | 113 |
| Eduardo Ortíz | 2144-2146 | 19 | 21 | .475 | 2.95 | 84 | 47 | 0 | 0 | 3 | 320.0 | 282 | 105 | 27 | 134 | 285 |
| Héctor Ortíz | 2129-2135 | 13 | 13 | .500 | 4.06 | 63 | 37 | 5 | 0 | 9 | 277.0 | 287 | 125 | 15 | 77 | 212 |
| José Ortíz | 2111-2119 | 16 | 11 | .593 | 3.60 | 112 | 16 | 3 | 0 | 6 | 245.1 | 208 | 98 | 21 | 101 | 287 |
| Vicente Ortíz | 2104-2104 | 2 | 1 | .667 | 3.20 | 11 | 0 | 0 | 0 | 2 | 19.2 | 18 | 7 | 0 | 19 | 0 |
| Alfonso Osequedo | 2139-2139 | 12 | 7 | .632 | 2.79 | 26 | 26 | 1 | 0 | 0 | 183.2 | 157 | 57 | 4 | 60 | 150 |
| Masashige Ota | 2145-2146 | 9 | 8 | .529 | 1.70 | 56 | 17 | 0 | 0 | 2 | 163.2 | 105 | 31 | 5 | 63 | 189 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Senichi Otsuka | 2110-2110 | 0 | 0 | .000 | 0.87 | 10 | 0 | 0 | 0 | 3 | 10.1 | 10 | 1 | 1 | 5 | 5 |
| Kokaji Ottah | 2145-2146 | 5 | 3 | .625 | 1.71 | 22 | 3 | 0 | 0 | 1 | 58.0 | 31 | 11 | 1 | 16 | 54 |
| Lucas Overy | 2144-2146 | 9 | 5 | .643 | 1.97 | 62 | 10 | 0 | 0 | 10 | 127.2 | 114 | 28 | 4 | 43 | 119 |
