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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 |
|---|---|---|---|---|---|---|---|---|---|
| Danus Ja Mansk | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Dexter Ja Mansk | 2023-2023 | .199 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Befikadu Jabillo | 2041-2042 | .333 | 1 | 1 | 2 | 0 | 0 | 2.18 | 15 |
| Daol Jacq | 2048-2049 | .000 | 0 | 0 | 1 | 1 | 0 | 0.79 | 22 |
| Raul Jacquez | 2011-2011 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| C.L.R. James | 2025-2028 | .100 | 0 | 2 | 26 | 16 | 2 | 4.57 | 310 |
| Goigan Jamor | 2030-2047 | .305 | 246 | 931 | 0 | 0 | 0 | 0.00 | 0 |
| Herger Janetsson | 2046-2048 | .195 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Otha Janousek | 2010-2014 | .062 | 0 | 0 | 4 | 7 | 0 | 8.46 | 43 |
| Kasumi Jardim | 2046-2051 | .137 | 0 | 9 | 38 | 50 | 3 | 4.14 | 574 |
| Milton Jared | 2009-2015 | .000 | 0 | 0 | 11 | 8 | 6 | 5.88 | 170 |
| Christopher Jefferson | 2009-2011 | .190 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| William Jelinek | 2016-2023 | .238 | 27 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy Jenkins | 2024-2026 | .195 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| John Jessen | 2004-2005 | .308 | 0 | 1 | 2 | 4 | 0 | 4.07 | 32 |
| Dikrsm Jevakhov | 2048-2048 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rocco Jin | 2005-2005 | .000 | 0 | 0 | 3 | 11 | 0 | 5.22 | 69 |
| Grimjack John | 2005-2005 | .174 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Darwin Johnson | 2005-2005 | .133 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph Johnston | 2008-2008 | .000 | 0 | 0 | 15 | 15 | 0 | 3.61 | 146 |
| Austin Jorgenson | 2008-2008 | .276 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Nathanial Jose | 2007-2007 | .000 | 0 | 0 | 3 | 1 | 0 | 3.36 | 44 |
| Ruben Josephs | 2032-2032 | .246 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jankees Josey | 2023-2026 | .308 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Goradoc Jour | 2025-2027 | .208 | 10 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Journey | 2012-2012 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Journey | 2038-2040 | .000 | 0 | 0 | 2 | 1 | 0 | 5.77 | 39 |
| Mogdush Journey | 2038-2038 | .087 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jolly Journeyman | 2012-2023 | .239 | 47 | 213 | 0 | 0 | 0 | 0.00 | 0 |
| Emmanuel Judd | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Hubzub Jukhtanov | 2044-2046 | .000 | 0 | 0 | 1 | 3 | 0 | 5.40 | 17 |
| Yann Jumba | 2046-2051 | .250 | 0 | 0 | 21 | 15 | 2 | 4.13 | 340 |
| Adamnan Jurasín | 2049-2050 | .000 | 0 | 0 | 3 | 6 | 0 | 6.37 | 63 |
| Christina Jusefsson | 2046-2051 | .167 | 0 | 0 | 14 | 5 | 3 | 2.44 | 175 |
| Okri Jusefsson | 2045-2045 | .000 | 0 | 0 | 0 | 1 | 0 | 5.06 | 2 |
| Frank Justus | 2003-2003 | .211 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Caoimhín Júlia | 2039-2045 | .000 | 0 | 0 | 24 | 33 | 84 | 2.95 | 449 |
