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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tom O'Day | 48-1 | 157 | 83 | .654 | 3.93 | 352 | 352 | 17 | 6 | 0 | 2268.1 | 2230 | 990 | 157 | 870 | 2088 |
| Eric O'Farrell | 0-0 | 8 | 5 | .615 | 5.53 | 105 | 6 | 0 | 0 | 2 | 200.1 | 226 | 123 | 26 | 86 | 115 |
| Clayton O'Neil | 5-1 | 42 | 55 | .433 | 4.65 | 501 | 67 | 5 | 0 | 107 | 991.0 | 1060 | 512 | 133 | 402 | 836 |
| Carl O'Quinn | 5-0 | 50 | 67 | .427 | 5.44 | 149 | 148 | 8 | 0 | 0 | 898.0 | 1005 | 543 | 176 | 325 | 640 |
| José Ochoa | 2-1 | 35 | 35 | .500 | 5.07 | 581 | 0 | 0 | 0 | 38 | 719.0 | 733 | 405 | 73 | 411 | 620 |
| Hideki Ohayashi | 0-0 | 0 | 0 | .000 | 3.57 | 10 | 0 | 0 | 0 | 1 | 17.2 | 17 | 7 | 2 | 15 | 12 |
| Masayuki Okada | 0-0 | 0 | 0 | .000 | 11.88 | 5 | 0 | 0 | 0 | 0 | 8.1 | 15 | 11 | 3 | 4 | 5 |
| Izumo Okumura | 0-0 | 0 | 0 | .000 | 8.44 | 8 | 0 | 0 | 0 | 1 | 16.0 | 17 | 15 | 7 | 14 | 20 |
| Jeff Olsen | 3-0 | 31 | 32 | .492 | 5.10 | 82 | 76 | 2 | 0 | 1 | 443.0 | 474 | 251 | 57 | 148 | 235 |
| Taro Omori | 2-1 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Katsumi Onishi | -2-2 | 20 | 20 | .500 | 5.53 | 315 | 0 | 0 | 0 | 6 | 379.0 | 428 | 233 | 67 | 261 | 354 |
| Takao Onishi | 0-0 | 0 | 7 | .000 | 6.84 | 17 | 8 | 0 | 0 | 0 | 52.2 | 73 | 40 | 8 | 22 | 26 |
| Yasujiro Ono | 6-1 | 37 | 31 | .544 | 4.40 | 563 | 12 | 0 | 0 | 65 | 550.0 | 515 | 269 | 66 | 299 | 707 |
| Rick Oram | 0-0 | 0 | 0 | .000 | 1.69 | 13 | 0 | 0 | 0 | 0 | 5.1 | 6 | 1 | 0 | 6 | 4 |
| Giuseppe Orati | 0-1 | 1 | 0 | 1.000 | 4.05 | 8 | 0 | 0 | 0 | 0 | 13.1 | 9 | 6 | 4 | 3 | 20 |
| Ramiro Ortega | 13-1 | 71 | 78 | .477 | 4.72 | 998 | 49 | 1 | 0 | 50 | 1402.1 | 1585 | 736 | 161 | 477 | 1088 |
| Félix Ortíz | 1-0 | 4 | 6 | .400 | 4.50 | 116 | 0 | 0 | 0 | 2 | 140.0 | 149 | 70 | 11 | 69 | 104 |
| Jesús Ortíz | 2-6 | 25 | 17 | .595 | 4.53 | 281 | 6 | 0 | 0 | 36 | 403.2 | 408 | 203 | 42 | 160 | 323 |
| Jorge Ortíz | 5-1 | 71 | 63 | .530 | 5.12 | 257 | 182 | 3 | 0 | 3 | 1183.2 | 1168 | 674 | 186 | 639 | 1116 |
| Pedro Ortíz | 0-0 | 0 | 0 | .000 | 11.00 | 5 | 0 | 0 | 0 | 0 | 9.0 | 13 | 11 | 3 | 4 | 6 |
| Robert Osborne | 4-2018 | 18 | 30 | .375 | 5.63 | 87 | 76 | 0 | 0 | 0 | 372.2 | 414 | 233 | 43 | 192 | 264 |
| Eisuke Ota | 0-2 | 0 | 0 | .000 | 1.83 | 3 | 3 | 0 | 0 | 0 | 19.2 | 13 | 4 | 2 | 3 | 10 |
| Fernando Otero | 0-6 | 2 | 5 | .286 | 6.04 | 9 | 8 | 0 | 0 | 1 | 44.2 | 58 | 30 | 7 | 10 | 27 |
| Vicente Otero | 2-1 | 19 | 24 | .442 | 4.61 | 294 | 2 | 0 | 0 | 28 | 421.1 | 419 | 216 | 60 | 184 | 391 |
| Woody Owen | 4-0 | 61 | 57 | .517 | 5.86 | 216 | 130 | 7 | 2 | 5 | 907.1 | 1037 | 591 | 145 | 443 | 694 |
| Jacob Owens | -1-0 | 1 | 4 | .200 | 5.85 | 53 | 1 | 0 | 0 | 1 | 84.2 | 94 | 55 | 18 | 57 | 46 |
| Tom Owens | 31-0 | 87 | 103 | .458 | 4.38 | 350 | 275 | 6 | 1 | 7 | 1618.0 | 1706 | 788 | 99 | 650 | 1070 |
| Tom Owens | 21-1 | 129 | 141 | .478 | 5.01 | 451 | 366 | 6 | 1 | 9 | 2333.0 | 2717 | 1298 | 361 | 775 | 1611 |
| Kichibei Ozawa | 0-2 | 8 | 13 | .381 | 5.11 | 42 | 20 | 0 | 0 | 4 | 174.1 | 192 | 99 | 26 | 66 | 123 |
