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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 |
|---|---|---|---|---|---|---|---|---|---|
| J.A. Jabs | 2026-2039 | .000 | 0 | 0 | 152 | 100 | 9 | 3.86 | 1910 |
| Robbie Jackinson | 2051-2059 | .250 | 43 | 341 | 0 | 0 | 0 | 0.00 | 0 |
| JD Jacks | 2026-2038 | .279 | 261 | 904 | 0 | 0 | 0 | 0.00 | 0 |
| Crash Jackson | 2056-2060 | .000 | 0 | 0 | 15 | 31 | 3 | 6.61 | 210 |
| Dash Jackson | 2067-2067 | .000 | 0 | 0 | 2 | 0 | 1 | 2.97 | 40 |
| Hunter Jackson | 2059-2062 | .000 | 0 | 0 | 3 | 4 | 2 | 6.61 | 167 |
| Jackson Jackson | 2017-2028 | .267 | 90 | 476 | 0 | 0 | 0 | 0.00 | 0 |
| Latavuis Jackson | 2043-2044 | .000 | 0 | 0 | 1 | 2 | 1 | 7.31 | 58 |
| Loren Jackson | 2056-2066 | .266 | 72 | 481 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Jackson | 2020-2029 | .222 | 53 | 270 | 0 | 1 | 0 | 10.80 | 2 |
| Smash Jackson | 2036-2041 | .000 | 0 | 0 | 37 | 45 | 19 | 4.11 | 804 |
| Tim Jackson | 2017-2022 | .000 | 0 | 0 | 23 | 29 | 62 | 4.07 | 287 |
| Michael Jackson II | 2034-2034 | .000 | 0 | 0 | 0 | 1 | 0 | 4.64 | 23 |
| Jet Jaguar | 2045-2056 | .235 | 108 | 516 | 0 | 0 | 0 | 0.00 | 0 |
| Alyssa Jakob | 2059-2067 | .276 | 164 | 585 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Jakob | 2041-2053 | .272 | 243 | 855 | 0 | 0 | 0 | 0.00 | 0 |
| LeHarm James | 2058-2066 | .000 | 0 | 0 | 52 | 87 | 31 | 4.64 | 1065 |
| Holden Jamm | 2066-2067 | .207 | 9 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Damian Jansen-Crenshaw | 2045-2056 | .000 | 0 | 0 | 117 | 93 | 38 | 4.05 | 1812 |
| Axel Jasper | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| D'Qryss Jean-Yves | 2057-2059 | .000 | 0 | 0 | 0 | 2 | 2 | 7.36 | 12 |
| Kim Ji-Woo | 2062-2067 | .000 | 0 | 0 | 27 | 22 | 21 | 3.98 | 493 |
| DingDing Jimbo | 2032-2034 | .000 | 0 | 0 | 6 | 7 | 5 | 4.14 | 108 |
| Chris Jimenez | 2041-2050 | .263 | 192 | 713 | 0 | 0 | 0 | 0.00 | 0 |
| John Jacob Jingleheimer Schmidt | 2056-2066 | .278 | 249 | 740 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Jingles | 2037-2037 | .167 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Fureemu Jobu | 2065-2066 | .212 | 1 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Jodan | 2035-2043 | .000 | 0 | 0 | 9 | 14 | 12 | 4.90 | 394 |
| Bazooka Joe | 2051-2062 | .000 | 0 | 0 | 116 | 86 | 38 | 3.81 | 1940 |
| Sloppy Joe | 2065-2067 | .000 | 0 | 0 | 11 | 15 | 5 | 3.96 | 287 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Joey | 2050-2051 | .000 | 0 | 0 | 7 | 32 | 0 | 6.37 | 136 |
| Alain Johns | 2027-2035 | .279 | 110 | 508 | 0 | 0 | 0 | 0.00 | 0 |
| Jackson Johns | 2054-2057 | .224 | 18 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Johnson | 2036-2043 | .000 | 0 | 0 | 55 | 65 | 12 | 4.30 | 899 |
| Beef Johnson | 2044-2054 | .239 | 107 | 362 | 0 | 0 | 0 | 0.00 | 0 |
| Carl Johnson | 2060-2067 | .000 | 0 | 0 | 58 | 55 | 5 | 4.61 | 868 |
| Clem Johnson | 2020-2034 | .281 | 200 | 759 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Johnson | 2046-2054 | .256 | 171 | 553 | 0 | 0 | 0 | 0.00 | 0 |
| Icebox Johnson | 2040-2048 | .000 | 0 | 0 | 22 | 28 | 33 | 5.00 | 383 |
| Taylor Johnson | 2034-2044 | .000 | 0 | 0 | 114 | 93 | 0 | 4.22 | 1938 |
| Zak Johnson | 2034-2044 | .264 | 147 | 576 | 0 | 0 | 0 | 0.00 | 0 |
| Zak Johnson Jr. | 2054-2066 | .269 | 280 | 975 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Johnsson | 2030-2036 | .000 | 0 | 0 | 16 | 25 | 62 | 4.78 | 403 |
| Dan Johnston | 2064-2067 | .218 | 23 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Joeman Johnston V | 2029-2036 | .213 | 69 | 258 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Jolly | 2060-2067 | .221 | 39 | 245 | 0 | 0 | 0 | 0.00 | 0 |
| Bailey Jones | 2056-2062 | .251 | 68 | 294 | 0 | 0 | 0 | 0.00 | 0 |
| Ciz Jones | 2064-2064 | .111 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Giuseppe Jones | 2048-2061 | .000 | 0 | 0 | 137 | 91 | 14 | 3.81 | 2039 |
| Goof-Ball Jones | 2051-2062 | .000 | 0 | 0 | 10 | 7 | 5 | 4.56 | 234 |
| Ransom Jones | 2066-2067 | .000 | 0 | 0 | 11 | 5 | 8 | 2.44 | 134 |
| Toledo Jones | 2024-2029 | .208 | 76 | 280 | 0 | 0 | 0 | 0.00 | 0 |
| Walrus Jones | 2048-2060 | .000 | 0 | 0 | 119 | 138 | 0 | 4.15 | 2156 |
| Wombat Jones | 2063-2067 | .000 | 0 | 0 | 30 | 23 | 53 | 3.25 | 451 |
| Anna Joosten | 2018-2024 | .000 | 0 | 0 | 70 | 57 | 0 | 4.09 | 826 |
| Byron Joseph | 2064-2064 | .173 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Joy | 2064-2065 | .212 | 7 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Arson Judge | 2066-2067 | .253 | 26 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Juicy Jumbo | 2067-2067 | .000 | 0 | 0 | 0 | 0 | 1 | 3.22 | 27 |
| Jeremiah Junkball | 2044-2056 | .000 | 0 | 0 | 20 | 20 | 24 | 5.45 | 540 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Justin Justice | 2053-2057 | .247 | 55 | 199 | 0 | 0 | 0 | 0.00 | 0 |
| Sax Justice | 2044-2058 | .262 | 205 | 780 | 0 | 0 | 0 | 0.00 | 0 |
| Tex Justice | 2039-2039 | .175 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Ty Justice | 2017-2018 | .308 | 13 | 98 | 0 | 0 | 0 | 0.00 | 0 |
