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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dan Jackson | 2059-2061 | .000 | 0 | 0 | 8 | 6 | 7 | 3.64 | 98 |
| Eric Jackson | 2055-2062 | .000 | 0 | 0 | 9 | 8 | 0 | 3.88 | 98 |
| Matt Jackson | 2054-2055 | .308 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Jacoby | 2062-2062 | .286 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Oscar Jaime | 2054-2054 | .105 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gabe James | 2062-2065 | .000 | 0 | 0 | 7 | 8 | 56 | 3.25 | 150 |
| Pat James | 2059-2060 | .185 | 14 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Janvrin | 2064-2065 | .353 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Jarratt | 2062-2065 | .000 | 0 | 0 | 1 | 7 | 0 | 6.03 | 60 |
| Dan Jarrett | 2056-2065 | .000 | 0 | 0 | 13 | 20 | 3 | 3.94 | 263 |
| Tom Jarvis | 2065-2065 | .000 | 0 | 0 | 3 | 4 | 1 | 5.80 | 57 |
| Louis Jeffery | 2052-2064 | .000 | 0 | 0 | 44 | 48 | 14 | 4.49 | 625 |
| Mike Jeffrey | 2061-2065 | .000 | 0 | 0 | 11 | 16 | 0 | 5.14 | 143 |
| Ken Jenkins | 2057-2059 | .000 | 0 | 0 | 6 | 12 | 41 | 3.68 | 88 |
| Pierre Ji | 2064-2065 | .000 | 0 | 0 | 1 | 0 | 1 | 5.89 | 23 |
| Miguel Jimenez | 2059-2065 | .260 | 77 | 239 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Jiménez | 2061-2065 | .207 | 58 | 236 | 0 | 0 | 0 | 0.00 | 0 |
| César Jiménez | 2057-2062 | .235 | 30 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jiménez | 2058-2063 | .233 | 16 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jiménez | 2055-2063 | .230 | 71 | 314 | 0 | 0 | 0 | 0.00 | 0 |
| Gertjan Johnson | 2052-2052 | .000 | 0 | 0 | 0 | 1 | 0 | 16.20 | 3 |
| Mike Johnson | 2055-2057 | .000 | 0 | 0 | 3 | 4 | 0 | 5.57 | 60 |
| Tim Joiner | 2055-2065 | .231 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Joly | 2061-2063 | .000 | 0 | 0 | 3 | 3 | 0 | 3.15 | 47 |
| Bob Jones | 2060-2064 | .000 | 0 | 0 | 21 | 33 | 67 | 3.99 | 438 |
| Gene Jones | 2062-2065 | .302 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Jones | 2063-2063 | .000 | 0 | 0 | 0 | 0 | 0 | 18.00 | 1 |
| Sean Jones | 2062-2062 | .276 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Jones | 2062-2063 | .255 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Zacarias Jos | 2063-2064 | .290 | 4 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ted Joseph | 2049-2052 | .278 | 32 | 173 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Juárez | 2065-2065 | .000 | 0 | 0 | 4 | 7 | 0 | 3.59 | 55 |
