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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 | 2018-2018 | 13 | 5 | .722 | 3.75 | 22 | 22 | 1 | 0 | 0 | 139.1 | 138 | 58 | 10 | 56 | 126 |
| 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 | 2016-2018 | 1 | 4 | .200 | 4.35 | 82 | 0 | 0 | 0 | 15 | 122.0 | 115 | 59 | 12 | 64 | 136 |
| Carl O'Quinn | 2017-2018 | 19 | 13 | .594 | 4.54 | 42 | 42 | 2 | 0 | 0 | 279.1 | 274 | 141 | 44 | 108 | 225 |
| 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 | 2018-2018 | 1 | 0 | 1.000 | 4.30 | 20 | 0 | 0 | 0 | 0 | 37.2 | 36 | 18 | 2 | 17 | 22 |
| 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 |
| 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 | 2017-2018 | 4 | 3 | .571 | 3.35 | 40 | 0 | 0 | 0 | 1 | 45.2 | 50 | 17 | 5 | 27 | 29 |
| Takao Onishi | 2018-2018 | 0 | 5 | .000 | 9.58 | 5 | 5 | 0 | 0 | 0 | 20.2 | 36 | 22 | 5 | 8 | 8 |
| Yasujiro Ono | 2017-2018 | 0 | 2 | .000 | 4.41 | 39 | 0 | 0 | 0 | 2 | 34.2 | 24 | 17 | 8 | 31 | 42 |
| Rick Oram | 2018-2018 | 0 | 0 | .000 | 1.69 | 13 | 0 | 0 | 0 | 0 | 5.1 | 6 | 1 | 0 | 6 | 4 |
| Ramiro Ortega | 2012-2018 | 25 | 21 | .543 | 4.58 | 397 | 10 | 0 | 0 | 13 | 469.1 | 507 | 239 | 48 | 193 | 420 |
| 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 | 2017-2018 | 13 | 12 | .520 | 5.69 | 34 | 34 | 0 | 0 | 0 | 183.1 | 211 | 116 | 22 | 87 | 131 |
| Ryan Owens | 2012-2017 | 11 | 22 | .333 | 6.38 | 54 | 35 | 1 | 0 | 1 | 227.0 | 281 | 161 | 30 | 127 | 139 |
| Tom Owens | 2012-2018 | 60 | 56 | .517 | 3.78 | 247 | 172 | 3 | 0 | 7 | 1083.1 | 1057 | 455 | 50 | 410 | 835 |
| Tom Owens | 2013-2018 | 37 | 48 | .435 | 4.97 | 132 | 128 | 3 | 0 | 0 | 758.0 | 865 | 419 | 107 | 361 | 485 |
