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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 | 1 | 0 | 1.000 | 2.33 | 5 | 1 | 0 | 0 | 0 | 19.1 | 15 | 5 | 2 | 7 | 20 |
| Enrique Ocampo | 2112-2115 | 17 | 5 | .773 | 2.29 | 218 | 1 | 0 | 0 | 3 | 263.2 | 169 | 67 | 18 | 119 | 252 |
| Kisho Ohayashi | 2126-2128 | 7 | 3 | .700 | 3.09 | 130 | 1 | 0 | 0 | 0 | 180.2 | 158 | 62 | 11 | 51 | 142 |
| Takao Ohayashi | 2127-2129 | 10 | 13 | .435 | 4.31 | 133 | 2 | 0 | 0 | 12 | 173.1 | 202 | 83 | 12 | 73 | 166 |
| Teemu Ojanen | 2100-2104 | 14 | 12 | .538 | 3.42 | 92 | 39 | 1 | 0 | 2 | 300.0 | 294 | 114 | 32 | 90 | 257 |
| Dimas Olival | 2124-2129 | 5 | 6 | .455 | 3.45 | 12 | 12 | 2 | 0 | 0 | 75.2 | 70 | 29 | 4 | 28 | 71 |
| Rajminder Omarjeet | 2101-2113 | 0 | 0 | .000 | 11.57 | 2 | 0 | 0 | 0 | 0 | 2.1 | 6 | 3 | 1 | 2 | 0 |
| Takiji Ono | 2122-2129 | 9 | 9 | .500 | 3.53 | 123 | 0 | 0 | 0 | 29 | 155.2 | 125 | 61 | 13 | 52 | 184 |
| Pedro Ontiveros | 2118-2119 | 0 | 2 | .000 | 5.10 | 53 | 0 | 0 | 0 | 0 | 77.2 | 94 | 44 | 12 | 29 | 59 |
| Reþit Orbay | 2118-2122 | 12 | 16 | .429 | 4.24 | 207 | 0 | 0 | 0 | 5 | 301.2 | 264 | 142 | 50 | 115 | 358 |
| Raúl Ordóñez | 2104-2108 | 0 | 0 | .000 | 3.60 | 20 | 0 | 0 | 0 | 2 | 25.0 | 24 | 10 | 2 | 12 | 17 |
| Galip Orga | 2104-2111 | 28 | 23 | .549 | 3.37 | 380 | 1 | 0 | 0 | 85 | 413.2 | 362 | 155 | 30 | 161 | 366 |
| Andrés Ortíz | 2110-2114 | 58 | 63 | .479 | 3.86 | 152 | 152 | 17 | 4 | 0 | 1014.1 | 957 | 435 | 114 | 351 | 719 |
| Josuke Osada | 2100-2104 | 56 | 62 | .475 | 3.30 | 166 | 162 | 8 | 2 | 0 | 1062.2 | 957 | 390 | 115 | 292 | 883 |
| Khaleel Osmani | 2126-2129 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 1 | 0 |
| Seika Otani | 2101-2103 | 12 | 16 | .429 | 5.45 | 81 | 32 | 0 | 0 | 0 | 229.2 | 251 | 139 | 41 | 84 | 225 |
| Senichi Otsuka | 2101-2109 | 27 | 42 | .391 | 4.40 | 328 | 63 | 0 | 0 | 4 | 658.2 | 644 | 322 | 67 | 282 | 507 |
| Duridar Ottah | 2102-2108 | 3 | 2 | .600 | 3.00 | 22 | 0 | 0 | 0 | 0 | 30.0 | 28 | 10 | 4 | 7 | 18 |
| Matt Ottenhof | 2108-2112 | 0 | 0 | .000 | 19.64 | 6 | 0 | 0 | 0 | 0 | 11.0 | 19 | 24 | 4 | 19 | 2 |
| Ibrahim Ouaziz | 2102-2111 | 10 | 11 | .476 | 4.75 | 157 | 10 | 0 | 0 | 5 | 256.0 | 302 | 135 | 21 | 142 | 148 |
| Nabil Owuor | 2100-2100 | 3 | 5 | .375 | 4.16 | 40 | 6 | 0 | 0 | 3 | 75.2 | 84 | 35 | 10 | 29 | 64 |
