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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shawn O'Brien | 2012-2017 | 10 | 14 | .417 | 3.59 | 121 | 0 | 0 | 0 | 36 | 153.0 | 131 | 61 | 11 | 68 | 133 |
| William O'Brien | 2047-2049 | 2 | 0 | 1.000 | 2.77 | 14 | 0 | 0 | 0 | 1 | 26.0 | 19 | 8 | 2 | 18 | 26 |
| Eric O'Bryan | 2020-2033 | 20 | 7 | .741 | 4.00 | 90 | 27 | 2 | 1 | 3 | 274.1 | 285 | 122 | 20 | 93 | 260 |
| Dave O'Cosgrove | 2047-2050 | 3 | 0 | 1.000 | 0.88 | 12 | 0 | 0 | 0 | 0 | 30.2 | 15 | 3 | 1 | 12 | 32 |
| Alan O'Criodan | 2049-2051 | 2 | 2 | .500 | 3.72 | 35 | 4 | 0 | 0 | 1 | 82.1 | 70 | 34 | 13 | 27 | 104 |
| Steve O'Feeny | 2037-2040 | 12 | 6 | .667 | 3.68 | 32 | 27 | 1 | 0 | 0 | 168.2 | 150 | 69 | 22 | 78 | 148 |
| Brett O'Halloran | 2028-2029 | 3 | 2 | .600 | 5.15 | 33 | 7 | 0 | 0 | 0 | 71.2 | 79 | 41 | 8 | 30 | 70 |
| Doug O'Halloran | 2023-2029 | 18 | 13 | .581 | 3.24 | 189 | 0 | 0 | 0 | 47 | 194.1 | 197 | 70 | 9 | 74 | 141 |
| David O'Heydon | 2034-2036 | 15 | 13 | .536 | 3.70 | 39 | 33 | 0 | 0 | 0 | 204.1 | 199 | 84 | 15 | 83 | 158 |
| Scott O'Larissey | 2028-2035 | 28 | 17 | .622 | 3.36 | 276 | 0 | 0 | 0 | 30 | 267.2 | 265 | 100 | 23 | 83 | 196 |
| Dominic O'Neal | 2015-2028 | 35 | 22 | .614 | 3.66 | 73 | 70 | 5 | 1 | 0 | 455.1 | 407 | 185 | 35 | 107 | 460 |
| Mike O'Neal | 2015-2021 | 10 | 8 | .556 | 5.80 | 133 | 1 | 0 | 0 | 4 | 156.2 | 177 | 101 | 18 | 84 | 109 |
| Bobby O'Quinn | 2042-2046 | 22 | 42 | .344 | 4.27 | 82 | 76 | 7 | 1 | 1 | 504.0 | 529 | 239 | 48 | 189 | 387 |
| Will O'Reilly | 2012-2014 | 30 | 18 | .625 | 3.08 | 77 | 60 | 8 | 2 | 1 | 450.0 | 435 | 154 | 42 | 85 | 302 |
| Jason Odom | 2017-2020 | 23 | 12 | .657 | 3.84 | 86 | 40 | 5 | 1 | 1 | 323.2 | 283 | 138 | 34 | 121 | 244 |
| Tomohiko Ohayashi | 2021-2022 | 1 | 2 | .333 | 9.00 | 12 | 0 | 0 | 0 | 0 | 11.0 | 15 | 11 | 1 | 8 | 12 |
| Toru Ohayashi | 2013-2014 | 7 | 3 | .700 | 3.63 | 61 | 5 | 0 | 0 | 3 | 116.2 | 124 | 47 | 11 | 43 | 102 |
| Yoshifumi Okamoto | 2036-2040 | 37 | 31 | .544 | 3.84 | 89 | 89 | 15 | 3 | 0 | 607.0 | 561 | 259 | 56 | 202 | 513 |
| Dan Oldreive | 2014-2020 | 37 | 28 | .569 | 4.20 | 195 | 87 | 4 | 1 | 4 | 634.2 | 664 | 296 | 57 | 166 | 513 |
| Ismael Olivares | 2034-2042 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Luis Olivares | 2049-2051 | 10 | 14 | .417 | 3.88 | 51 | 47 | 4 | 1 | 0 | 246.0 | 223 | 106 | 43 | 70 | 290 |
| Rob Olivarez | 2031-2042 | 40 | 28 | .588 | 3.84 | 133 | 91 | 4 | 1 | 7 | 637.0 | 564 | 272 | 77 | 209 | 611 |
| Mauro Olivas | 2013-2017 | 27 | 17 | .614 | 4.15 | 57 | 57 | 4 | 1 | 0 | 379.2 | 428 | 175 | 29 | 79 | 192 |
| Colton Oliver | 2028-2034 | 7 | 20 | .259 | 4.02 | 133 | 22 | 0 | 0 | 6 | 324.2 | 306 | 145 | 42 | 122 | 259 |
| Bradley Olson | 2011-2023 | 21 | 6 | .778 | 2.63 | 39 | 39 | 5 | 0 | 0 | 274.0 | 246 | 80 | 12 | 54 | 204 |
| Peter Olson | 2021-2026 | 36 | 17 | .679 | 3.65 | 88 | 64 | 3 | 1 | 3 | 456.2 | 473 | 185 | 52 | 100 | 348 |
| Richie Olvera | 2043-2049 | 16 | 20 | .444 | 4.42 | 55 | 48 | 0 | 0 | 0 | 267.0 | 236 | 131 | 16 | 125 | 231 |
| Min-gook Ong | 2046-2049 | 16 | 22 | .421 | 4.23 | 129 | 25 | 2 | 0 | 9 | 338.0 | 333 | 159 | 56 | 86 | 336 |
| Kozue Ono | 2014-2021 | 14 | 17 | .452 | 3.68 | 217 | 1 | 0 | 0 | 52 | 261.1 | 265 | 107 | 24 | 103 | 238 |
| Javier Ontiveros | 2051-2051 | 1 | 1 | .500 | 2.62 | 3 | 3 | 1 | 0 | 0 | 24.0 | 25 | 7 | 5 | 0 | 24 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Felipe Ordóñez | 2011-2023 | 2 | 4 | .333 | 2.95 | 61 | 0 | 0 | 0 | 35 | 64.0 | 57 | 21 | 5 | 16 | 35 |
| Steve Orduna | 2010-2010 | 11 | 13 | .458 | 3.77 | 36 | 34 | 3 | 0 | 0 | 231.2 | 252 | 97 | 15 | 72 | 169 |
| Alfredo Ornelas | 2035-2044 | 33 | 30 | .524 | 2.95 | 107 | 67 | 9 | 1 | 9 | 546.2 | 492 | 179 | 42 | 193 | 402 |
| Cris Orozco | 2012-2014 | 9 | 14 | .391 | 4.12 | 105 | 0 | 0 | 0 | 46 | 126.2 | 140 | 58 | 13 | 48 | 95 |
| Adrian Orr | 2028-2042 | 9 | 10 | .474 | 4.69 | 140 | 13 | 0 | 0 | 7 | 257.0 | 264 | 134 | 36 | 127 | 252 |
| Arturo Ortíz | 2043-2044 | 4 | 4 | .500 | 2.54 | 30 | 0 | 0 | 0 | 6 | 49.2 | 37 | 14 | 5 | 15 | 50 |
| Fernando Ortíz | 2028-2029 | 2 | 4 | .333 | 5.10 | 16 | 11 | 0 | 0 | 0 | 65.1 | 77 | 37 | 8 | 36 | 48 |
| Juan Ortíz | 2028-2031 | 11 | 21 | .344 | 5.11 | 55 | 55 | 0 | 0 | 0 | 295.2 | 297 | 168 | 45 | 167 | 339 |
| Lorenzo Ortíz | 2039-2047 | 16 | 15 | .516 | 4.23 | 136 | 11 | 2 | 0 | 7 | 325.2 | 296 | 153 | 42 | 135 | 270 |
| Manuel Ortíz | 2011-2017 | 23 | 24 | .489 | 4.34 | 226 | 17 | 0 | 0 | 39 | 342.1 | 342 | 165 | 30 | 140 | 268 |
| Marcos Ortiz | 2011-2011 | 2 | 1 | .667 | 5.61 | 9 | 2 | 0 | 0 | 0 | 25.2 | 32 | 16 | 1 | 3 | 15 |
| Pedro Ortíz | 2023-2035 | 1 | 5 | .167 | 3.19 | 59 | 0 | 0 | 0 | 16 | 73.1 | 51 | 26 | 7 | 47 | 115 |
| Edmund Osborne | 2010-2022 | 24 | 16 | .600 | 5.60 | 55 | 51 | 3 | 0 | 1 | 342.1 | 406 | 213 | 42 | 98 | 268 |
| Greg Osborne | 2046-2051 | 6 | 4 | .600 | 2.59 | 39 | 0 | 0 | 0 | 14 | 48.2 | 33 | 14 | 5 | 27 | 53 |
| Luis Osorio | 2046-2051 | 13 | 17 | .433 | 4.46 | 47 | 37 | 1 | 0 | 1 | 240.0 | 216 | 119 | 29 | 98 | 189 |
| Kenko Otani | 2034-2034 | 5 | 5 | .500 | 3.31 | 16 | 16 | 0 | 0 | 0 | 92.1 | 91 | 34 | 7 | 23 | 78 |
| Fu-Kang Ow | 2050-2051 | 16 | 7 | .696 | 2.32 | 31 | 27 | 8 | 3 | 1 | 205.2 | 146 | 53 | 26 | 52 | 273 |
| Joe Owen | 2050-2051 | 16 | 21 | .432 | 4.56 | 51 | 51 | 2 | 0 | 0 | 290.0 | 297 | 147 | 24 | 119 | 229 |
| Mike Owen | 2028-2032 | 19 | 10 | .655 | 3.67 | 108 | 27 | 1 | 1 | 4 | 272.1 | 228 | 111 | 22 | 167 | 298 |
| Henry Owens | 2036-2042 | 20 | 22 | .476 | 3.01 | 251 | 0 | 0 | 0 | 117 | 257.1 | 217 | 86 | 19 | 121 | 286 |
| Juro Ozawa | 2029-2032 | 9 | 6 | .600 | 2.47 | 101 | 0 | 0 | 0 | 34 | 105.2 | 94 | 29 | 8 | 40 | 114 |
