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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alec Jackson | 2035-2035 | 1 | 0 | 1.000 | 2.40 | 16 | 0 | 0 | 0 | 1 | 30.0 | 34 | 8 | 3 | 3 | 28 |
| Ben Jackson | 2024-2024 | 3 | 6 | .333 | 7.78 | 12 | 10 | 0 | 0 | 0 | 56.2 | 80 | 49 | 10 | 36 | 35 |
| Chris Jackson | 2035-2035 | 5 | 6 | .455 | 4.63 | 35 | 15 | 0 | 0 | 2 | 126.1 | 149 | 65 | 8 | 46 | 76 |
| Donald Jackson | 2033-2035 | 8 | 7 | .533 | 3.63 | 24 | 24 | 7 | 1 | 0 | 171.0 | 188 | 69 | 14 | 60 | 110 |
| John Jackson | 2025-2025 | 7 | 5 | .583 | 3.68 | 14 | 14 | 4 | 0 | 0 | 95.1 | 90 | 39 | 10 | 42 | 88 |
| Kevin Jackson | 2018-2026 | 10 | 11 | .476 | 4.56 | 98 | 22 | 3 | 2 | 0 | 262.1 | 302 | 133 | 13 | 88 | 157 |
| Bryan Jacobs | 2033-2035 | 11 | 9 | .550 | 4.98 | 88 | 28 | 1 | 0 | 3 | 272.2 | 301 | 151 | 47 | 82 | 210 |
| Floyd Janik | 2014-2014 | 11 | 11 | .500 | 3.42 | 27 | 27 | 1 | 0 | 0 | 184.1 | 170 | 70 | 12 | 44 | 134 |
| Miguel Jaramillo | 2030-2035 | 32 | 40 | .444 | 4.64 | 110 | 110 | 1 | 0 | 0 | 591.0 | 599 | 305 | 67 | 210 | 392 |
| Tim Jefferson | 2029-2030 | 0 | 7 | .000 | 8.29 | 18 | 8 | 0 | 0 | 0 | 46.2 | 63 | 43 | 9 | 26 | 32 |
| Greg Jenkins | 2024-2025 | 20 | 16 | .556 | 4.23 | 50 | 50 | 6 | 1 | 0 | 349.1 | 379 | 164 | 31 | 66 | 260 |
| Kieran Jenkins | 2029-2035 | 19 | 18 | .514 | 3.98 | 53 | 53 | 3 | 1 | 0 | 346.0 | 347 | 153 | 30 | 107 | 321 |
| Errol Johnson | 2034-2034 | 1 | 0 | 1.000 | 6.35 | 7 | 0 | 0 | 0 | 0 | 11.1 | 14 | 8 | 1 | 7 | 7 |
| Harry Johnson | 2014-2016 | 2 | 3 | .400 | 2.65 | 46 | 1 | 0 | 0 | 4 | 91.2 | 73 | 27 | 5 | 19 | 51 |
| Cullen Jones | 2022-2027 | 34 | 28 | .548 | 4.83 | 118 | 70 | 12 | 1 | 1 | 567.0 | 669 | 304 | 53 | 179 | 393 |
| Don Jones | 2033-2035 | 12 | 13 | .480 | 4.10 | 31 | 31 | 3 | 1 | 0 | 210.2 | 190 | 96 | 21 | 115 | 160 |
| Fred Jones | 2013-2020 | 53 | 45 | .541 | 3.84 | 141 | 141 | 16 | 4 | 0 | 963.2 | 937 | 411 | 50 | 368 | 466 |
| Glenn Jones | 2025-2029 | 10 | 15 | .400 | 4.33 | 122 | 0 | 0 | 0 | 40 | 135.0 | 158 | 65 | 11 | 64 | 62 |
| Jason Jones | 2032-2033 | 1 | 0 | 1.000 | 5.70 | 39 | 1 | 0 | 0 | 1 | 23.2 | 30 | 15 | 3 | 8 | 21 |
| Mike Jones | 2026-2032 | 25 | 49 | .338 | 4.89 | 191 | 135 | 0 | 0 | 6 | 677.2 | 773 | 368 | 58 | 379 | 435 |
| Collin Jordan | 2030-2031 | 1 | 2 | .333 | 6.00 | 24 | 0 | 0 | 0 | 1 | 30.0 | 40 | 20 | 2 | 16 | 21 |
| Salvador Jordan | 2021-2022 | 9 | 18 | .333 | 5.80 | 36 | 36 | 0 | 0 | 0 | 218.2 | 266 | 141 | 33 | 82 | 110 |
| Kevin Joseph | 2023-2025 | 11 | 9 | .550 | 5.61 | 37 | 30 | 3 | 1 | 1 | 195.2 | 235 | 122 | 18 | 78 | 107 |
| Yunosuke Jouon | 2034-2035 | 14 | 16 | .467 | 3.40 | 50 | 50 | 1 | 1 | 0 | 314.2 | 294 | 119 | 30 | 94 | 187 |
| Christian June | 2014-2016 | 13 | 46 | .220 | 6.38 | 70 | 69 | 3 | 1 | 0 | 385.0 | 483 | 273 | 31 | 182 | 104 |
