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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 | 2013-2017 | 8 | 5 | .615 | 6.40 | 122 | 0 | 0 | 0 | 8 | 135.0 | 130 | 96 | 13 | 108 | 88 |
| William O'Brien | 2047-2047 | 0 | 0 | .000 | 2.35 | 5 | 5 | 0 | 0 | 0 | 7.2 | 7 | 2 | 0 | 3 | 5 |
| Eric O'Bryan | 2021-2033 | 71 | 68 | .511 | 4.82 | 347 | 188 | 12 | 5 | 22 | 1381.0 | 1444 | 739 | 112 | 710 | 979 |
| Dave O'Cosgrove | 2049-2051 | 2 | 1 | .667 | 3.92 | 34 | 0 | 0 | 0 | 1 | 85.0 | 85 | 37 | 6 | 41 | 71 |
| Alan O'Criodan | 2051-2051 | 1 | 0 | 1.000 | 3.38 | 2 | 0 | 0 | 0 | 0 | 8.0 | 7 | 3 | 1 | 1 | 8 |
| Steve O'Feeny | 2040-2040 | 0 | 0 | .000 | 1.42 | 3 | 0 | 0 | 0 | 0 | 6.1 | 4 | 1 | 1 | 0 | 8 |
| Brett O'Halloran | 2027-2029 | 0 | 0 | .000 | 6.61 | 8 | 0 | 0 | 0 | 0 | 16.1 | 20 | 12 | 1 | 8 | 10 |
| Doug O'Halloran | 2025-2026 | 2 | 1 | .667 | 4.94 | 82 | 0 | 0 | 0 | 0 | 31.0 | 30 | 17 | 3 | 23 | 21 |
| David O'Heydon | 2035-2047 | 119 | 135 | .469 | 4.33 | 368 | 329 | 29 | 8 | 1 | 2211.1 | 2277 | 1063 | 281 | 658 | 1554 |
| Scott O'Larissey | 2029-2036 | 3 | 1 | .750 | 3.93 | 45 | 0 | 0 | 0 | 0 | 89.1 | 96 | 39 | 12 | 28 | 41 |
| Dominic O'Neal | 2017-2029 | 126 | 121 | .510 | 4.53 | 344 | 311 | 19 | 1 | 0 | 2027.0 | 2030 | 1020 | 226 | 736 | 1579 |
| Mike O'Neal | 2014-2017 | 7 | 8 | .467 | 5.01 | 182 | 1 | 0 | 0 | 3 | 210.1 | 222 | 117 | 24 | 116 | 139 |
| Bobby O'Quinn | 2044-2051 | 60 | 52 | .536 | 4.76 | 215 | 136 | 2 | 1 | 1 | 1058.2 | 1050 | 560 | 168 | 350 | 959 |
| Jason Odom | 2018-2021 | 0 | 0 | .000 | 3.46 | 6 | 1 | 0 | 0 | 0 | 13.0 | 12 | 5 | 1 | 10 | 10 |
| Toru Ohayashi | 2013-2016 | 4 | 9 | .308 | 5.40 | 88 | 8 | 0 | 0 | 1 | 136.2 | 162 | 82 | 19 | 70 | 84 |
| Yoshifumi Okamoto | 2038-2050 | 105 | 96 | .522 | 4.35 | 263 | 256 | 39 | 10 | 0 | 1731.1 | 1849 | 836 | 219 | 540 | 1129 |
| Dan Oldreive | 2019-2019 | 0 | 0 | .000 | 10.80 | 4 | 0 | 0 | 0 | 0 | 6.2 | 8 | 8 | 1 | 8 | 1 |
| Vernon Olguin | 2007-2009 | 25 | 29 | .463 | 5.21 | 90 | 69 | 1 | 0 | 0 | 452.1 | 520 | 262 | 59 | 103 | 272 |
| Luis Olivares | 2049-2051 | 0 | 7 | .000 | 6.48 | 34 | 23 | 0 | 0 | 0 | 90.1 | 105 | 65 | 22 | 22 | 86 |
| Rob Olivarez | 2034-2041 | 16 | 8 | .667 | 4.58 | 69 | 33 | 0 | 0 | 1 | 238.0 | 241 | 121 | 43 | 92 | 205 |
| Colton Oliver | 2031-2031 | 0 | 0 | .000 | 9.90 | 10 | 0 | 0 | 0 | 0 | 10.0 | 16 | 11 | 4 | 3 | 11 |
| Ruben Olmeda | 2007-2009 | 17 | 31 | .354 | 4.92 | 66 | 66 | 2 | 2 | 0 | 385.2 | 355 | 211 | 58 | 153 | 356 |
| Bradley Olson | 2013-2023 | 64 | 52 | .552 | 4.43 | 260 | 161 | 10 | 1 | 1 | 1180.1 | 1334 | 581 | 142 | 310 | 786 |
| Peter Olson | 2022-2028 | 46 | 57 | .447 | 4.62 | 160 | 133 | 4 | 1 | 1 | 889.1 | 916 | 457 | 147 | 256 | 578 |
| Richie Olvera | 2044-2051 | 21 | 18 | .538 | 3.91 | 215 | 21 | 1 | 0 | 14 | 356.1 | 332 | 155 | 28 | 151 | 352 |
| Frank Oneill | 2007-2007 | 4 | 9 | .308 | 6.34 | 16 | 16 | 0 | 0 | 0 | 92.1 | 118 | 65 | 15 | 27 | 54 |
| Min-gook Ong | 2048-2048 | 0 | 2 | .000 | 4.91 | 29 | 23 | 0 | 0 | 0 | 40.1 | 41 | 22 | 10 | 6 | 30 |
| Kozue Ono | 2016-2021 | 13 | 11 | .542 | 5.74 | 241 | 0 | 0 | 0 | 7 | 268.0 | 304 | 171 | 51 | 146 | 207 |
| Felipe Ordóñez | 2012-2026 | 61 | 59 | .508 | 4.58 | 790 | 35 | 1 | 0 | 108 | 1045.0 | 1126 | 532 | 132 | 306 | 728 |
| Steve Orduna | 2011-2020 | 84 | 128 | .396 | 5.00 | 313 | 288 | 21 | 4 | 0 | 1795.2 | 1931 | 997 | 218 | 770 | 1323 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Alfredo Ornelas | 2037-2044 | 40 | 79 | .336 | 4.90 | 192 | 149 | 20 | 4 | 1 | 1027.0 | 1159 | 559 | 160 | 355 | 551 |
| Cris Orozco | 2014-2015 | 5 | 6 | .455 | 4.73 | 73 | 9 | 0 | 0 | 1 | 152.1 | 179 | 80 | 14 | 50 | 64 |
| Adrian Orr | 2030-2042 | 19 | 21 | .475 | 4.22 | 256 | 0 | 0 | 0 | 9 | 360.2 | 320 | 169 | 37 | 194 | 305 |
| Isaac Ortega | 2007-2009 | 13 | 15 | .464 | 4.61 | 50 | 45 | 1 | 0 | 0 | 279.0 | 318 | 143 | 23 | 90 | 100 |
| Arturo Ortíz | 2043-2049 | 28 | 22 | .560 | 4.35 | 276 | 16 | 0 | 0 | 20 | 484.1 | 461 | 234 | 57 | 192 | 454 |
| Fernando Ortíz | 2029-2044 | 192 | 180 | .516 | 3.96 | 498 | 498 | 17 | 10 | 0 | 3071.1 | 2925 | 1352 | 498 | 751 | 2729 |
| Juan Ortíz | 2030-2033 | 13 | 30 | .302 | 4.74 | 95 | 54 | 0 | 0 | 0 | 359.0 | 310 | 189 | 59 | 203 | 414 |
| Lorenzo Ortíz | 2039-2042 | 8 | 7 | .533 | 4.74 | 84 | 0 | 0 | 0 | 1 | 131.0 | 125 | 69 | 11 | 84 | 96 |
| Manuel Ortíz | 2017-2017 | 1 | 0 | 1.000 | 15.43 | 5 | 0 | 0 | 0 | 0 | 4.2 | 8 | 8 | 1 | 7 | 5 |
| Marcos Ortiz | 2009-2012 | 23 | 25 | .479 | 4.91 | 128 | 64 | 2 | 1 | 3 | 525.2 | 684 | 287 | 44 | 136 | 250 |
| Pedro Ortíz | 2024-2035 | 34 | 38 | .472 | 3.73 | 626 | 1 | 0 | 0 | 100 | 753.0 | 572 | 312 | 108 | 394 | 1114 |
| Edmund Osborne | 2011-2020 | 83 | 98 | .459 | 5.28 | 318 | 220 | 12 | 1 | 2 | 1464.2 | 1606 | 860 | 229 | 550 | 1340 |
| Greg Osborne | 2051-2051 | 0 | 3 | .000 | 4.42 | 24 | 0 | 0 | 0 | 0 | 59.0 | 47 | 29 | 3 | 30 | 38 |
| Luis Osorio | 2049-2051 | 4 | 7 | .364 | 4.84 | 52 | 40 | 0 | 0 | 0 | 115.1 | 126 | 62 | 15 | 34 | 83 |
| Kenko Otani | 2033-2038 | 23 | 25 | .479 | 4.41 | 211 | 48 | 0 | 0 | 4 | 505.2 | 545 | 248 | 67 | 151 | 352 |
| Joe Owen | 2051-2051 | 0 | 0 | .000 | 5.40 | 4 | 0 | 0 | 0 | 0 | 6.2 | 4 | 4 | 0 | 8 | 9 |
| Mike Owen | 2030-2031 | 4 | 0 | 1.000 | 3.89 | 23 | 0 | 0 | 0 | 2 | 39.1 | 23 | 17 | 6 | 30 | 43 |
| Henry Owens | 2037-2041 | 8 | 5 | .615 | 4.29 | 100 | 0 | 0 | 0 | 2 | 126.0 | 108 | 60 | 12 | 79 | 99 |
| Juro Ozawa | 2024-2032 | 29 | 16 | .644 | 3.93 | 340 | 0 | 0 | 0 | 7 | 462.2 | 446 | 202 | 35 | 230 | 421 |
| Dario Ozuna | 2007-2009 | 3 | 6 | .333 | 5.17 | 83 | 0 | 0 | 0 | 11 | 87.0 | 96 | 50 | 17 | 34 | 72 |
