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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Charles O'Connor | 2012-2016 | 19 | 17 | .528 | 2.70 | 316 | 0 | 0 | 0 | 48 | 343.1 | 273 | 103 | 17 | 150 | 309 |
| Tom O'Day | 2018-2019 | 22 | 17 | .564 | 4.14 | 55 | 55 | 1 | 0 | 0 | 332.2 | 336 | 153 | 25 | 146 | 304 |
| Paul O'Dell | 2017-2018 | 1 | 5 | .167 | 16.48 | 11 | 6 | 0 | 0 | 0 | 25.2 | 53 | 47 | 7 | 37 | 8 |
| Brian O'Keggan | 2012-2017 | 29 | 34 | .460 | 5.01 | 252 | 56 | 1 | 1 | 4 | 552.0 | 650 | 307 | 89 | 127 | 330 |
| Jeff O'Macken | 2012-2012 | 0 | 2 | .000 | 11.93 | 5 | 3 | 0 | 0 | 0 | 14.1 | 31 | 19 | 5 | 10 | 10 |
| Clayton O'Neil | 2016-2019 | 3 | 9 | .250 | 4.70 | 131 | 0 | 0 | 0 | 22 | 168.2 | 167 | 88 | 20 | 83 | 179 |
| Carl O'Quinn | 2017-2019 | 29 | 29 | .500 | 4.73 | 75 | 75 | 3 | 0 | 0 | 477.1 | 495 | 251 | 83 | 188 | 364 |
| Dave O'Rorke | 2012-2012 | 4 | 4 | .500 | 5.31 | 17 | 14 | 0 | 0 | 0 | 79.2 | 97 | 47 | 10 | 41 | 42 |
| Francisco Ochoa | 2014-2014 | 0 | 2 | .000 | 14.46 | 3 | 3 | 0 | 0 | 0 | 9.1 | 21 | 15 | 3 | 8 | 6 |
| José Ochoa | 2018-2019 | 2 | 2 | .500 | 6.71 | 38 | 0 | 0 | 0 | 3 | 59.0 | 66 | 44 | 6 | 34 | 37 |
| Masayuki Okada | 2018-2018 | 0 | 0 | .000 | 11.88 | 5 | 0 | 0 | 0 | 0 | 8.1 | 15 | 11 | 3 | 4 | 5 |
| Tsumemasa Okada | 2012-2014 | 12 | 4 | .750 | 4.73 | 142 | 1 | 0 | 0 | 4 | 173.0 | 184 | 91 | 15 | 77 | 121 |
| Izumo Okumura | 2019-2019 | 0 | 0 | .000 | 8.44 | 8 | 0 | 0 | 0 | 1 | 16.0 | 17 | 15 | 7 | 14 | 20 |
| Wesley Oliver | 2012-2012 | 2 | 3 | .400 | 5.62 | 51 | 0 | 0 | 0 | 1 | 73.2 | 88 | 46 | 12 | 42 | 52 |
| Jeff Olsen | 2014-2016 | 31 | 32 | .492 | 5.10 | 82 | 76 | 2 | 0 | 1 | 443.0 | 474 | 251 | 57 | 148 | 235 |
| Marshall Olsen | 2012-2014 | 9 | 12 | .429 | 4.42 | 159 | 1 | 0 | 0 | 24 | 181.1 | 171 | 89 | 20 | 77 | 209 |
| Katsumi Onishi | 2017-2019 | 6 | 4 | .600 | 4.38 | 79 | 0 | 0 | 0 | 2 | 100.2 | 112 | 49 | 15 | 66 | 65 |
| Takao Onishi | 2018-2018 | 0 | 5 | .000 | 9.58 | 5 | 5 | 0 | 0 | 0 | 20.2 | 36 | 22 | 5 | 8 | 8 |
| Yasujiro Ono | 2017-2019 | 7 | 2 | .778 | 5.25 | 93 | 0 | 0 | 0 | 2 | 70.1 | 72 | 41 | 14 | 51 | 89 |
| Rick Oram | 2018-2018 | 0 | 0 | .000 | 1.69 | 13 | 0 | 0 | 0 | 0 | 5.1 | 6 | 1 | 0 | 6 | 4 |
| Ramiro Ortega | 2012-2019 | 32 | 24 | .571 | 4.34 | 468 | 10 | 0 | 0 | 18 | 541.2 | 569 | 261 | 50 | 217 | 489 |
| Jorge Ortíz | 2019-2019 | 2 | 0 | 1.000 | 3.14 | 2 | 2 | 0 | 0 | 0 | 14.1 | 14 | 5 | 2 | 3 | 7 |
| Pedro Ortíz | 2017-2017 | 0 | 0 | .000 | 11.00 | 5 | 0 | 0 | 0 | 0 | 9.0 | 13 | 11 | 3 | 4 | 6 |
| Robert Osborne | 2016-2018 | 18 | 30 | .375 | 5.63 | 87 | 76 | 0 | 0 | 0 | 372.2 | 414 | 233 | 43 | 192 | 264 |
| Woody Owen | 2017-2019 | 25 | 19 | .568 | 5.33 | 65 | 65 | 0 | 0 | 0 | 368.0 | 398 | 218 | 45 | 183 | 265 |
| Ryan Owens | 2012-2017 | 11 | 22 | .333 | 6.38 | 54 | 35 | 1 | 0 | 1 | 227.0 | 281 | 161 | 30 | 127 | 139 |
| Tom Owens | 2012-2019 | 62 | 59 | .512 | 3.80 | 254 | 179 | 3 | 0 | 7 | 1124.0 | 1096 | 474 | 53 | 423 | 861 |
| Tom Owens | 2013-2019 | 48 | 57 | .457 | 4.87 | 164 | 158 | 3 | 0 | 0 | 941.2 | 1062 | 510 | 132 | 431 | 619 |
