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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 |
| Paul O'Dell | 2017-2017 | 1 | 3 | .250 | 14.21 | 7 | 4 | 0 | 0 | 0 | 19.0 | 36 | 30 | 4 | 27 | 6 |
| 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 | 2016-2017 | 0 | 1 | .000 | 5.15 | 33 | 0 | 0 | 0 | 2 | 50.2 | 46 | 29 | 9 | 28 | 52 |
| Carl O'Quinn | 2017-2017 | 3 | 2 | .600 | 3.30 | 8 | 8 | 1 | 0 | 0 | 62.2 | 52 | 23 | 7 | 17 | 52 |
| 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 |
| 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 | 2017-2017 | 2 | 3 | .400 | 4.15 | 21 | 0 | 0 | 0 | 1 | 21.2 | 27 | 10 | 3 | 17 | 13 |
| Yasujiro Ono | 2017-2017 | 0 | 0 | .000 | 4.35 | 8 | 0 | 0 | 0 | 0 | 10.1 | 6 | 5 | 3 | 8 | 14 |
| Ramiro Ortega | 2012-2017 | 20 | 14 | .588 | 4.72 | 339 | 10 | 0 | 0 | 11 | 421.1 | 460 | 221 | 43 | 175 | 372 |
| Pedro Ortíz | 2017-2017 | 0 | 0 | .000 | 11.00 | 5 | 0 | 0 | 0 | 0 | 9.0 | 13 | 11 | 3 | 4 | 6 |
| Robert Osborne | 2016-2017 | 16 | 25 | .390 | 5.31 | 67 | 56 | 0 | 0 | 0 | 286.2 | 321 | 169 | 32 | 132 | 206 |
| Woody Owen | 2017-2017 | 9 | 8 | .529 | 4.85 | 22 | 22 | 0 | 0 | 0 | 124.1 | 136 | 67 | 13 | 56 | 91 |
| Ryan Owens | 2012-2017 | 11 | 22 | .333 | 6.38 | 54 | 35 | 1 | 0 | 1 | 227.0 | 281 | 161 | 30 | 127 | 139 |
| Tom Owens | 2012-2017 | 54 | 48 | .529 | 3.64 | 218 | 143 | 3 | 0 | 7 | 936.2 | 905 | 379 | 39 | 353 | 741 |
| Tom Owens | 2013-2017 | 28 | 40 | .412 | 4.76 | 105 | 101 | 3 | 0 | 0 | 602.2 | 676 | 319 | 80 | 287 | 367 |
