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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 |
|---|---|---|---|---|---|---|---|---|---|
| Danny Jackson | 2038-2045 | .000 | 0 | 0 | 48 | 38 | 1 | 3.90 | 622 |
| Jamar Jackson | 2041-2045 | .209 | 5 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Jamie Jackson | 2041-2044 | .000 | 0 | 0 | 12 | 12 | 0 | 4.51 | 156 |
| Jay Jackson | 2034-2046 | .317 | 83 | 547 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Jackson | 2032-2033 | .000 | 0 | 0 | 3 | 3 | 0 | 3.83 | 50 |
| Ryan Jackson | 2028-2032 | .272 | 33 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Jacobs | 2046-2046 | .000 | 0 | 0 | 6 | 5 | 0 | 3.28 | 57 |
| Danny Jacobson | 2036-2045 | .292 | 11 | 166 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Jacquez | 2034-2035 | .000 | 0 | 0 | 2 | 13 | 0 | 6.26 | 86 |
| Chad Jaeger | 2036-2046 | .251 | 25 | 185 | 0 | 0 | 0 | 0.00 | 0 |
| Abdul-Salam Jafar | 2037-2037 | .000 | 0 | 0 | 0 | 7 | 0 | 12.00 | 13 |
| Cory James | 2024-2026 | .185 | 9 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Dave James | 2040-2041 | .000 | 0 | 0 | 2 | 2 | 0 | 5.43 | 58 |
| Theodore Jansen | 2040-2045 | .000 | 0 | 0 | 2 | 2 | 2 | 2.73 | 61 |
| Mario Jaramillo | 2032-2036 | .000 | 0 | 0 | 6 | 5 | 0 | 5.63 | 103 |
| Nelson Jaramillo | 2046-2046 | .000 | 0 | 0 | 0 | 2 | 0 | 1.86 | 33 |
| Santiago Jaramillo | 2029-2033 | .290 | 4 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Art Jarmon | 2046-2046 | .216 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| J.J. Jarosz | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 5 |
| Robert Jarquin | 2044-2046 | .291 | 10 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Jasper | 2022-2038 | .000 | 0 | 0 | 27 | 36 | 2 | 4.80 | 457 |
| Garrett Jefferis | 2038-2038 | .000 | 0 | 0 | 2 | 5 | 0 | 6.58 | 24 |
| Mike Jenco | 2035-2041 | .271 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| David Jenkins | 2038-2040 | .222 | 6 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Jenkins | 2035-2035 | .000 | 0 | 0 | 4 | 10 | 0 | 7.40 | 49 |
| John Jensen | 2043-2046 | .000 | 0 | 0 | 2 | 5 | 1 | 3.78 | 68 |
| Josh Jensen | 2028-2028 | .222 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Jernigan | 2032-2043 | .254 | 37 | 297 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Jimenez | 2034-2039 | .000 | 0 | 0 | 6 | 2 | 1 | 4.24 | 205 |
| Victor Jimenez | 2022-2035 | .000 | 0 | 0 | 71 | 86 | 0 | 4.36 | 935 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| John Jobe | 2042-2046 | .279 | 13 | 127 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Johns | 2027-2027 | .229 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Chase Johnson | 2024-2032 | .000 | 0 | 0 | 26 | 21 | 2 | 4.46 | 426 |
| Danny Johnson | 2029-2030 | .000 | 0 | 0 | 0 | 0 | 1 | 5.91 | 6 |
| Joe Johnson | 2041-2041 | .000 | 0 | 0 | 0 | 0 | 0 | 10.57 | 5 |
| Justin Johnson | 2034-2041 | .268 | 10 | 182 | 0 | 0 | 0 | 0.00 | 0 |
| Lance Johnson | 2036-2043 | .251 | 38 | 228 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Johnson | 2045-2045 | .222 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Matthew Johnson | 2033-2039 | .000 | 0 | 0 | 17 | 19 | 57 | 4.05 | 183 |
| Morgan Johnson | 2027-2035 | .249 | 77 | 293 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Johnson | 2038-2046 | .000 | 0 | 0 | 6 | 1 | 2 | 3.65 | 119 |
| Ryan Johnson | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 13 |
| Sean Johnson | 2038-2046 | .290 | 54 | 381 | 0 | 0 | 0 | 0.00 | 0 |
| Terrence Johnson | 2027-2034 | .260 | 4 | 184 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Johnson | 2046-2046 | .261 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Johnson | 2030-2033 | .233 | 9 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Jones | 2033-2040 | .209 | 8 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Jones | 2022-2031 | .000 | 0 | 0 | 15 | 12 | 11 | 3.49 | 159 |
| David Jones | 2022-2031 | .000 | 0 | 0 | 7 | 3 | 6 | 3.66 | 156 |
| Gabriel Jones | 2033-2039 | .000 | 0 | 0 | 5 | 6 | 22 | 5.11 | 114 |
| Jim Jones | 2044-2046 | .000 | 0 | 0 | 4 | 15 | 12 | 4.62 | 154 |
| Justin Jones | 2035-2035 | .000 | 0 | 0 | 2 | 1 | 0 | 4.09 | 38 |
| Lance Jones | 2044-2044 | .265 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Jones | 2030-2032 | .207 | 13 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Jones | 2024-2033 | .000 | 0 | 0 | 14 | 9 | 5 | 3.95 | 209 |
| Rick Jones | 2045-2046 | .254 | 15 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Christian Jordan | 2024-2030 | .000 | 0 | 0 | 43 | 48 | 0 | 4.42 | 514 |
| Joe Jordan | 2034-2035 | .261 | 5 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jorgensen | 2022-2042 | .000 | 0 | 0 | 20 | 15 | 4 | 3.98 | 179 |
| Reed Jorgenson | 2028-2041 | .000 | 0 | 0 | 25 | 54 | 46 | 4.74 | 431 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bob Judson | 2027-2037 | .227 | 6 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Chance Jue | 2034-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 4.85 | 9 |
| Newton Juhan | 2034-2046 | .000 | 0 | 0 | 53 | 41 | 6 | 3.80 | 678 |
| Chris Juran | 2035-2039 | .000 | 0 | 0 | 5 | 3 | 2 | 5.07 | 140 |
