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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 |
|---|---|---|---|---|---|---|---|---|---|
| Frank Jackson | 2017-2017 | .000 | 0 | 0 | 1 | 2 | 0 | 18.90 | 3 |
| Jason Jackson | 2015-2015 | .000 | 0 | 0 | 4 | 5 | 0 | 7.97 | 47 |
| Kent Jackson | 2021-2022 | .318 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Jackson | 2017-2017 | .400 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Leroy Jackson | 2015-2016 | .000 | 0 | 0 | 9 | 7 | 0 | 7.47 | 97 |
| Ricky Jackson | 2019-2024 | .000 | 0 | 0 | 21 | 15 | 1 | 3.64 | 241 |
| Robert Jackson | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy Jackson | 2017-2023 | .000 | 0 | 0 | 13 | 12 | 5 | 4.25 | 181 |
| Mario Jacome | 2029-2031 | .231 | 9 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Jaeckel | 2030-2033 | .246 | 22 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Howard Jamerson | 2031-2031 | .000 | 0 | 0 | 3 | 5 | 0 | 6.75 | 46 |
| Joe James | 2035-2035 | .308 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle James | 2019-2020 | .243 | 2 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2025-2025 | .000 | 0 | 0 | 2 | 3 | 9 | 5.66 | 21 |
| Andrew Jamison | 2031-2032 | .000 | 0 | 0 | 6 | 12 | 0 | 6.06 | 63 |
| Branlyn Jaraba | 2033-2035 | .000 | 0 | 0 | 9 | 5 | 23 | 3.71 | 78 |
| José Jarca | 2026-2026 | .292 | 8 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Kostenka Jarovtsev | 2032-2034 | .000 | 0 | 0 | 2 | 11 | 1 | 7.31 | 73 |
| Miika Jarvi | 2035-2035 | .000 | 0 | 0 | 1 | 0 | 0 | 3.62 | 25 |
| Atro Jarvilehto | 2033-2034 | .233 | 2 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Jefferson | 2019-2023 | .334 | 27 | 125 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Jenkins | 2033-2035 | .246 | 21 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| John Jenkins | 2015-2017 | .324 | 15 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Jenkins | 2018-2021 | .257 | 2 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Marty Jennings | 2022-2024 | .333 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Jensen | 2017-2018 | .000 | 0 | 0 | 5 | 4 | 2 | 5.19 | 71 |
| Adam Jensson | 2035-2035 | .059 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2027-2027 | .231 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Jiménez | 2015-2016 | .000 | 0 | 0 | 8 | 14 | 0 | 5.16 | 213 |
| Gilberto Jiménez | 2027-2027 | .259 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Luis Jiménez | 2015-2028 | .272 | 16 | 200 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Jiménez | 2015-2018 | .000 | 0 | 0 | 13 | 7 | 1 | 4.32 | 136 |
| Miguel Jiménez | 2027-2029 | .000 | 0 | 0 | 5 | 10 | 1 | 4.40 | 87 |
| Orlando Jiménez | 2015-2019 | .285 | 28 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Jiménez | 2023-2023 | .235 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Ji Jing | 2025-2025 | .000 | 0 | 0 | 8 | 2 | 0 | 2.18 | 71 |
| Sisay Jitu | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Terry John | 2033-2034 | .272 | 9 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Cole Johnson | 2015-2015 | .000 | 0 | 0 | 5 | 11 | 0 | 3.85 | 106 |
| Gary Johnson | 2035-2035 | .000 | 0 | 0 | 4 | 1 | 2 | 4.02 | 64 |
| James Johnson | 2016-2016 | .000 | 0 | 0 | 1 | 2 | 0 | 4.46 | 29 |
| John Johnson | 2015-2015 | .272 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Johnson | 2032-2033 | .000 | 0 | 0 | 3 | 6 | 18 | 2.45 | 37 |
| Rick Johnson | 2019-2020 | .316 | 12 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Terry Johnson | 2015-2021 | .267 | 19 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Johnston | 2015-2018 | .281 | 15 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Johnston | 2022-2028 | .257 | 8 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Johnston | 2019-2023 | .217 | 0 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Johnston | 2015-2015 | .222 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Johnstone | 2015-2018 | .307 | 65 | 250 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Johnstone | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 8.03 | 7 |
| Steven Johnstone | 2020-2023 | .189 | 10 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Ethan Jollymour | 2015-2019 | .302 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Barry Jones | 2016-2016 | .000 | 0 | 0 | 3 | 4 | 14 | 4.43 | 61 |
| Brian Jones | 2015-2018 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan Jones | 2015-2028 | .000 | 0 | 0 | 8 | 21 | 70 | 4.39 | 242 |
| Harrison Jones | 2021-2023 | .258 | 2 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Jones | 2022-2022 | .182 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Obi Jones | 2030-2033 | .280 | 11 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Jones | 2019-2019 | .237 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Teddy Jones | 2023-2024 | .000 | 0 | 0 | 14 | 12 | 0 | 3.18 | 184 |
| Timothy Jones | 2025-2026 | .268 | 7 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Jones | 2016-2022 | .000 | 0 | 0 | 17 | 17 | 1 | 3.85 | 390 |
| Brian Joo | 2034-2034 | .000 | 0 | 0 | 2 | 1 | 0 | 4.91 | 12 |
| Greg Jordan | 2017-2018 | .000 | 0 | 0 | 14 | 10 | 38 | 3.21 | 98 |
| Jasper Jordan | 2035-2035 | .000 | 0 | 0 | 2 | 3 | 13 | 3.49 | 73 |
| Gojong Joseon | 2031-2031 | .000 | 0 | 0 | 2 | 9 | 0 | 4.98 | 36 |
| Tomislav Jovovich | 2035-2035 | .269 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2025-2026 | .000 | 0 | 0 | 1 | 4 | 0 | 4.75 | 27 |
| José Juárez | 2020-2021 | .000 | 0 | 0 | 0 | 2 | 0 | 6.26 | 14 |
| José Juárez | 2016-2025 | .284 | 56 | 322 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Juárez | 2021-2021 | .469 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Justice | 2022-2031 | .193 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Júlio Justiniano | 2035-2035 | .000 | 0 | 0 | 1 | 2 | 2 | 4.95 | 32 |
