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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Donald Jackson | 2035-2035 | 3 | 2 | .600 | 4.46 | 7 | 7 | 0 | 0 | 0 | 34.1 | 41 | 17 | 3 | 11 | 32 |
| Kevin Jackson | 2018-2021 | 14 | 29 | .326 | 5.95 | 111 | 59 | 5 | 0 | 1 | 384.0 | 491 | 254 | 56 | 134 | 240 |
| Floyd Janik | 2005-2013 | 38 | 30 | .559 | 5.38 | 264 | 74 | 0 | 0 | 2 | 647.2 | 762 | 387 | 62 | 274 | 400 |
| Miguel Jaramillo | 2032-2034 | 1 | 2 | .333 | 4.37 | 6 | 3 | 0 | 0 | 0 | 22.2 | 22 | 11 | 4 | 14 | 15 |
| Greg Jenkins | 2025-2035 | 109 | 65 | .626 | 4.51 | 393 | 204 | 22 | 5 | 5 | 1620.2 | 1776 | 812 | 214 | 326 | 1170 |
| Kieran Jenkins | 2029-2034 | 29 | 56 | .341 | 5.38 | 210 | 92 | 9 | 1 | 1 | 754.0 | 837 | 451 | 131 | 334 | 642 |
| Harry Johnson | 2009-2015 | 14 | 19 | .424 | 5.52 | 218 | 6 | 0 | 0 | 3 | 279.0 | 343 | 171 | 41 | 78 | 169 |
| Cullen Jones | 2024-2026 | 2 | 3 | .400 | 6.66 | 13 | 6 | 0 | 0 | 0 | 48.2 | 67 | 36 | 7 | 30 | 24 |
| Don Jones | 2034-2035 | 2 | 7 | .222 | 5.68 | 45 | 11 | 0 | 0 | 1 | 123.2 | 130 | 78 | 14 | 116 | 111 |
| Fred Jones | 2018-2018 | 0 | 4 | .000 | 8.36 | 6 | 6 | 0 | 0 | 0 | 28.0 | 34 | 26 | 7 | 19 | 7 |
| Glenn Jones | 2026-2028 | 2 | 1 | .667 | 7.02 | 27 | 0 | 0 | 0 | 0 | 42.1 | 59 | 33 | 5 | 12 | 18 |
| Michael Jones | 2002-2010 | 39 | 39 | .500 | 4.13 | 568 | 1 | 0 | 0 | 72 | 632.1 | 637 | 290 | 28 | 168 | 421 |
| Brian Josephson | 2005-2010 | 10 | 20 | .333 | 5.34 | 341 | 0 | 0 | 0 | 17 | 384.1 | 394 | 228 | 36 | 202 | 226 |
| Steven Jurgens | 2002-2008 | 102 | 64 | .614 | 3.36 | 264 | 223 | 12 | 4 | 0 | 1672.1 | 1346 | 624 | 47 | 596 | 1125 |
