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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dean Jackson | 2035-2035 | .321 | 11 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Jackson | 2015-2016 | .000 | 0 | 0 | 1 | 1 | 0 | 4.65 | 42 |
| Kent Jackson | 2020-2020 | .242 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Jackson | 2033-2033 | .000 | 0 | 0 | 7 | 4 | 0 | 3.80 | 106 |
| Ricky Jackson | 2020-2021 | .000 | 0 | 0 | 5 | 13 | 21 | 3.79 | 100 |
| Robert Jackson | 2021-2023 | .271 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Russell Jackson | 2017-2017 | .313 | 22 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jackson | 2037-2038 | .000 | 0 | 0 | 9 | 5 | 1 | 4.90 | 69 |
| Timothy Jackson | 2015-2025 | .000 | 0 | 0 | 12 | 25 | 5 | 4.71 | 224 |
| Abraham Jacobs | 2023-2026 | .263 | 11 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Jacobson | 2038-2038 | .000 | 0 | 0 | 6 | 3 | 4 | 2.70 | 24 |
| Ryung Jae-Wook | 2039-2040 | .284 | 8 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Jamerson | 2016-2021 | .000 | 0 | 0 | 0 | 1 | 1 | 5.06 | 38 |
| Dan James | 2038-2038 | .284 | 9 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny James | 2037-2037 | .000 | 0 | 0 | 1 | 1 | 0 | 5.14 | 15 |
| Kyle James | 2021-2023 | .247 | 2 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Wallace James | 2021-2021 | .236 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2033-2033 | .000 | 0 | 0 | 1 | 1 | 0 | 1.93 | 7 |
| John Jamieson | 2040-2040 | .000 | 0 | 0 | 1 | 0 | 0 | 6.17 | 42 |
| Jin-soo Jan-Hui | 2038-2038 | .000 | 0 | 0 | 6 | 9 | 0 | 4.71 | 90 |
| Dane Jane | 2035-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 21.60 | 0 |
| Lex Janssen | 2037-2037 | .000 | 0 | 0 | 2 | 0 | 2 | 5.40 | 5 |
| Stuart Janssen | 2031-2036 | .147 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Maxime Janssens | 2026-2027 | .000 | 0 | 0 | 21 | 13 | 0 | 3.50 | 166 |
| Cornelio Japón | 2033-2034 | .222 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Japón | 2036-2036 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Jaramillo | 2033-2033 | .222 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Jaramillo | 2027-2027 | .417 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Kostenka Jarovtsev | 2031-2031 | .000 | 0 | 0 | 3 | 2 | 0 | 4.64 | 31 |
| Miika Jarvi | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 1.17 | 4 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Raúl Javier Jr. | 2027-2028 | .158 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Jefferson | 2024-2024 | .297 | 16 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2023-2031 | .252 | 18 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Rudy Jenkins | 2016-2022 | .000 | 0 | 0 | 5 | 7 | 0 | 3.78 | 97 |
| Marty Jennings | 2021-2021 | .300 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jensen | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 4.41 | 8 |
| Edward Jensen | 2015-2016 | .000 | 0 | 0 | 3 | 2 | 0 | 2.98 | 49 |
| Adam Jensson | 2033-2038 | .215 | 10 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Denis Jerningham | 2032-2032 | .281 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| John Jewell | 2031-2031 | .000 | 0 | 0 | 4 | 5 | 0 | 4.36 | 70 |
| Yong-ho Jheon | 2040-2040 | .300 | 8 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Tung Ji | 2029-2029 | .280 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tak-wai Jia | 2039-2040 | .208 | 9 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2023-2026 | .259 | 2 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Jiménez | 2020-2026 | .223 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Jiménez | 2026-2028 | .207 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Jiménez | 2021-2022 | .000 | 0 | 0 | 5 | 2 | 3 | 3.09 | 37 |
| Miguel Jiménez | 2025-2030 | .000 | 0 | 0 | 2 | 9 | 2 | 3.98 | 45 |
| Pedro Jiménez | 2022-2024 | .257 | 3 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jimínez | 2030-2036 | .293 | 69 | 251 | 0 | 0 | 0 | 0.00 | 0 |
| Gang Jing | 2036-2036 | .225 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Ton Jobse | 2029-2030 | .000 | 0 | 0 | 8 | 9 | 0 | 4.14 | 120 |
| Cole Johnson | 2021-2022 | .000 | 0 | 0 | 7 | 9 | 0 | 3.59 | 117 |
| Donald Johnson | 2017-2018 | .000 | 0 | 0 | 6 | 7 | 11 | 4.04 | 73 |
| Franklin Johnson | 2019-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 5.79 | 11 |
| Gary Johnson | 2037-2040 | .000 | 0 | 0 | 3 | 0 | 1 | 2.80 | 59 |
| Gregory Johnson | 2017-2017 | .328 | 6 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| James Johnson | 2017-2018 | .000 | 0 | 0 | 7 | 9 | 1 | 4.46 | 129 |
| Mike Johnson | 2032-2032 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Johnson | 2018-2018 | .377 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ralph Johnson | 2017-2018 | .342 | 9 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Johnson | 2016-2022 | .237 | 5 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Samual Johnson | 2040-2040 | .334 | 17 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Johnson | 2016-2019 | .302 | 15 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Terry Johnson | 2017-2019 | .251 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2015-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 5 |
| Larry Johnston | 2021-2021 | .258 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Johnston | 2023-2023 | .318 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph Johnston | 2037-2038 | .000 | 0 | 0 | 5 | 10 | 0 | 4.66 | 72 |
| Ron Johnston | 2024-2031 | .279 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Johnstone | 2021-2021 | .248 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| George Johnstone | 2035-2039 | .000 | 0 | 0 | 5 | 9 | 0 | 5.02 | 60 |
| Jim Johnstone | 2017-2022 | .000 | 0 | 0 | 14 | 15 | 0 | 4.88 | 196 |
| Steven Johnstone | 2015-2018 | .305 | 14 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Ethan Jollymour | 2021-2021 | .301 | 5 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan Jones | 2020-2027 | .000 | 0 | 0 | 4 | 2 | 2 | 2.63 | 36 |
| Derek Jones | 2037-2038 | .000 | 0 | 0 | 13 | 13 | 3 | 4.92 | 134 |
| Gary Jones | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 0 | 1.99 | 20 |
| Henry Jones | 2018-2019 | .331 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Jones | 2039-2039 | .271 | 9 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Jones | 2040-2040 | .000 | 0 | 0 | 3 | 2 | 0 | 1.87 | 35 |
| Leon Jones | 2019-2019 | .000 | 0 | 0 | 1 | 5 | 0 | 8.04 | 17 |
| Leonard Jones | 2015-2019 | .294 | 16 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Jones | 2035-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 2.57 | 11 |
| Steven Jones | 2021-2022 | .000 | 0 | 0 | 4 | 3 | 10 | 3.83 | 32 |
| Teddy Jones | 2020-2022 | .000 | 0 | 0 | 20 | 13 | 2 | 4.92 | 209 |
| Timothy Jones | 2023-2024 | .299 | 4 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Jing-sheng Joo | 2027-2029 | .266 | 5 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Jordan | 2030-2031 | .000 | 0 | 0 | 15 | 16 | 0 | 4.65 | 171 |
| Gojong Joseon | 2029-2030 | .000 | 0 | 0 | 7 | 5 | 0 | 4.15 | 54 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Daniel Joseph | 2039-2039 | .313 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Ricco Jovine | 2022-2022 | .182 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Joyce | 2019-2020 | .000 | 0 | 0 | 4 | 2 | 0 | 4.68 | 45 |
| Jack Joyner | 2034-2035 | .000 | 0 | 0 | 8 | 2 | 0 | 4.00 | 89 |
| Ken Joyner | 2040-2040 | .317 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jozwiak | 2025-2026 | .264 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Juárez | 2023-2024 | .238 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Juárez | 2026-2027 | .221 | 6 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2027-2029 | .000 | 0 | 0 | 10 | 9 | 16 | 3.59 | 88 |
| José Juárez | 2022-2024 | .000 | 0 | 0 | 6 | 4 | 2 | 2.96 | 77 |
| José Juárez | 2017-2026 | .282 | 15 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Juárez | 2020-2024 | .304 | 26 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| T.J. Juckson | 2034-2035 | .000 | 0 | 0 | 4 | 9 | 22 | 4.02 | 55 |
| Mariano Juderías | 2039-2039 | .238 | 4 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Júlio | 2030-2033 | .000 | 0 | 0 | 9 | 6 | 4 | 4.19 | 125 |
| José Júlio | 2018-2018 | .000 | 0 | 0 | 1 | 1 | 0 | 5.35 | 39 |
| Júlio Justiniano | 2034-2034 | .000 | 0 | 0 | 2 | 1 | 2 | 6.00 | 7 |
