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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Allan Jackson | 2018-2027 | .278 | 26 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Barrett Jackson | 2026-2027 | .000 | 0 | 0 | 1 | 0 | 2 | 1.40 | 20 |
| Brit Jackson | 2014-2021 | .000 | 0 | 0 | 2 | 3 | 1 | 2.55 | 78 |
| Bryan Jackson | 2016-2022 | .000 | 0 | 0 | 50 | 34 | 2 | 4.69 | 668 |
| Kevin Jackson | 2018-2025 | .000 | 0 | 0 | 4 | 7 | 11 | 5.23 | 150 |
| Mike Jackson | 2017-2021 | .000 | 0 | 0 | 8 | 3 | 5 | 4.93 | 200 |
| Pat Jackson | 2027-2027 | .000 | 0 | 0 | 3 | 4 | 0 | 4.85 | 28 |
| Stephen Jackson | 2017-2021 | .320 | 9 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Coy Jacobs | 2024-2027 | .277 | 71 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| John Jacobs | 2020-2021 | .000 | 0 | 0 | 6 | 8 | 57 | 2.80 | 90 |
| Johnny Jacobs | 2021-2027 | .000 | 0 | 0 | 27 | 25 | 50 | 3.82 | 306 |
| Todd Jacobs | 2019-2026 | .310 | 73 | 259 | 0 | 0 | 0 | 0.00 | 0 |
| Eddy Jacobse | 2023-2026 | .290 | 10 | 191 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Jacobson | 2018-2025 | .245 | 123 | 458 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jahn | 2023-2026 | .228 | 7 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Jeffery James | 2018-2019 | .000 | 0 | 0 | 10 | 8 | 5 | 4.49 | 116 |
| Jerry James | 2022-2024 | .000 | 0 | 0 | 1 | 0 | 0 | 8.15 | 43 |
| Steve James | 2013-2021 | .258 | 49 | 178 | 0 | 0 | 0 | 0.00 | 0 |
| Johannes Jancke | 2026-2027 | .263 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Joaquín Jaramillo | 2023-2027 | .291 | 13 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| José Jaramillo | 2016-2024 | .310 | 53 | 404 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jaramillo | 2025-2025 | .292 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Bhavsar Jayasurya | 2027-2027 | .238 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Jefferson | 2020-2021 | .000 | 0 | 0 | 3 | 10 | 0 | 7.63 | 77 |
| Geoffrey Jellineck | 2020-2027 | .290 | 113 | 401 | 0 | 0 | 0 | 0.00 | 0 |
| Ai-de Jen | 2020-2022 | .000 | 0 | 0 | 3 | 2 | 7 | 3.51 | 74 |
| Martin Jenkins | 2018-2021 | .264 | 8 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick Jenkins | 2014-2021 | .000 | 0 | 0 | 13 | 11 | 2 | 5.65 | 231 |
| Ryan Jenkins | 2019-2026 | .000 | 0 | 0 | 28 | 41 | 0 | 4.91 | 439 |
| Lou Jensen | 2017-2017 | .271 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ron Jeremy | 2026-2027 | .291 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Jerome | 2021-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 8.53 | 8 |
| Lawrence Jewers | 2020-2025 | .336 | 74 | 399 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Jiménez | 2022-2023 | .339 | 37 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Jiménez | 2023-2027 | .260 | 19 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2025-2027 | .286 | 0 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Paco Jiménez | 2026-2027 | .290 | 23 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Jiménez | 2027-2027 | .000 | 0 | 0 | 0 | 2 | 0 | 5.40 | 22 |
| Hai-dong Joe | 2018-2027 | .252 | 23 | 180 | 0 | 0 | 0 | 0.00 | 0 |
| Kennan Johannson | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 6.75 | 5 |
| Cutter John | 2017-2020 | .000 | 0 | 0 | 16 | 9 | 7 | 4.20 | 280 |
| Chris Johnson | 2022-2026 | .000 | 0 | 0 | 23 | 25 | 7 | 5.13 | 387 |
| Jack Johnson | 2012-2021 | .300 | 42 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Johnson | 2018-2022 | .276 | 121 | 439 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Johnson | 2014-2025 | .281 | 43 | 249 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick Johnson | 2024-2027 | .000 | 0 | 0 | 6 | 10 | 9 | 3.87 | 187 |
| Ron Johnson | 2024-2024 | .286 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ronnie Johnson | 2020-2024 | .285 | 36 | 252 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Johnson | 2017-2025 | .287 | 29 | 215 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Johnson | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 8.50 | 17 |
| Tanner Johnson | 2024-2024 | .000 | 0 | 0 | 1 | 0 | 0 | 3.38 | 12 |
| Todd Johnson | 2012-2026 | .000 | 0 | 0 | 23 | 13 | 26 | 3.51 | 397 |
| Bob Johnston | 2027-2027 | .000 | 0 | 0 | 7 | 10 | 0 | 5.26 | 112 |
| Clancy Johnston | 2026-2027 | .184 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Johnston | 2018-2025 | .000 | 0 | 0 | 33 | 28 | 12 | 4.66 | 625 |
| Joshua Johnston | 2018-2024 | .325 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Johnston | 2026-2027 | .000 | 0 | 0 | 10 | 7 | 0 | 4.80 | 164 |
| Paul Johnston | 2014-2025 | .000 | 0 | 0 | 8 | 11 | 0 | 4.04 | 103 |
| Steve Johnston | 2017-2022 | .252 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Johnston | 2016-2023 | .000 | 0 | 0 | 62 | 72 | 3 | 5.35 | 1002 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tom Johnston | 2015-2016 | .194 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Johnstone | 2013-2020 | .000 | 0 | 0 | 53 | 62 | 1 | 4.90 | 694 |
| Kai Jolliffe | 2026-2027 | .298 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Jones | 2012-2019 | .000 | 0 | 0 | 24 | 34 | 3 | 5.16 | 442 |
| Harvey Jones | 2013-2019 | .000 | 0 | 0 | 17 | 12 | 10 | 3.94 | 290 |
| John Jones | 2015-2024 | .306 | 35 | 216 | 0 | 0 | 0 | 0.00 | 0 |
| John Jones | 2017-2026 | .000 | 0 | 0 | 2 | 3 | 7 | 6.00 | 49 |
| Lee Jones | 2021-2022 | .274 | 3 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard Jones | 2019-2022 | .000 | 0 | 0 | 2 | 0 | 3 | 6.00 | 34 |
| Mike Jones | 2015-2021 | .000 | 0 | 0 | 16 | 13 | 5 | 5.05 | 410 |
| Nathan Jones | 2015-2021 | .277 | 50 | 238 | 0 | 0 | 0 | 0.00 | 0 |
| Oscar Jones | 2022-2026 | .322 | 18 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Jones | 2017-2021 | .238 | 34 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Jones | 2020-2023 | .000 | 0 | 0 | 3 | 2 | 0 | 4.59 | 64 |
| Kuang-an Joo | 2026-2027 | .000 | 0 | 0 | 2 | 6 | 30 | 3.49 | 181 |
| Zhi-peng Joo | 2024-2024 | .293 | 8 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Joseph | 2019-2026 | .280 | 105 | 359 | 0 | 0 | 0 | 0.00 | 0 |
| Keiji Jouon | 2015-2016 | .000 | 0 | 0 | 3 | 8 | 38 | 3.38 | 89 |
| Bruce Joyner | 2015-2024 | .292 | 48 | 220 | 0 | 0 | 0 | 0.00 | 0 |
| Earl Joyner | 2024-2026 | .296 | 3 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Xun Juan | 2024-2027 | .235 | 35 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Ye-qing Jue | 2024-2026 | .000 | 0 | 0 | 3 | 1 | 6 | 6.97 | 73 |
| Emir Jumah | 2023-2024 | .159 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ling-lai Jung | 2025-2025 | .000 | 0 | 0 | 1 | 1 | 0 | 20.65 | 3 |
| Mason Jupe | 2024-2027 | .292 | 10 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Loeck Jurgens | 2023-2027 | .000 | 0 | 0 | 26 | 19 | 0 | 4.38 | 356 |
