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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kent Jackson | 2036-2036 | 2 | 2 | .500 | 8.89 | 6 | 6 | 0 | 0 | 0 | 27.1 | 50 | 27 | 3 | 10 | 16 |
| Larry Jackson | 2045-2045 | 0 | 2 | .000 | 5.14 | 9 | 0 | 0 | 0 | 1 | 14.0 | 15 | 8 | 0 | 0 | 13 |
| Jeff Jacobs | 2046-2046 | 1 | 2 | .333 | 4.60 | 3 | 3 | 0 | 0 | 0 | 15.2 | 17 | 8 | 1 | 7 | 16 |
| Leslie James | 2036-2036 | 1 | 0 | 1.000 | 9.82 | 2 | 0 | 0 | 0 | 0 | 3.2 | 7 | 4 | 0 | 3 | 2 |
| Sam Jamison | 2037-2037 | 1 | 0 | 1.000 | 3.27 | 6 | 0 | 0 | 0 | 0 | 11.0 | 10 | 4 | 0 | 3 | 9 |
| Ernesto Jaramillo | 2040-2040 | 0 | 0 | .000 | 9.53 | 4 | 0 | 0 | 0 | 0 | 5.2 | 8 | 6 | 3 | 0 | 7 |
| Kevin Jenkins | 2044-2044 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Arnold Jensen | 2043-2044 | 3 | 2 | .600 | 3.21 | 8 | 8 | 0 | 0 | 0 | 47.2 | 41 | 17 | 7 | 12 | 47 |
| Ben Johnson | 2039-2041 | 1 | 6 | .143 | 8.14 | 21 | 0 | 0 | 0 | 4 | 24.1 | 35 | 22 | 3 | 17 | 22 |
| Bob Johnson | 2043-2046 | 0 | 0 | .000 | 4.85 | 23 | 0 | 0 | 0 | 2 | 39.0 | 45 | 21 | 3 | 20 | 39 |
| Cecil Johnson | 2040-2040 | 0 | 0 | .000 | 4.05 | 5 | 0 | 0 | 0 | 0 | 13.1 | 14 | 6 | 2 | 4 | 16 |
| Matt Johnson | 2037-2037 | 0 | 0 | .000 | 6.75 | 5 | 0 | 0 | 0 | 0 | 9.1 | 8 | 7 | 0 | 7 | 12 |
| Ronald Johnston | 2048-2048 | 0 | 0 | .000 | 2.45 | 5 | 0 | 0 | 0 | 0 | 7.1 | 6 | 2 | 1 | 1 | 5 |
| Calvin Jones | 2039-2041 | 2 | 3 | .400 | 9.43 | 8 | 3 | 0 | 0 | 0 | 21.0 | 31 | 22 | 5 | 12 | 17 |
| Rusty Jones | 2039-2039 | 3 | 3 | .500 | 3.74 | 6 | 6 | 0 | 0 | 0 | 33.2 | 31 | 14 | 5 | 10 | 25 |
| Nolan Jordan | 2037-2037 | 3 | 1 | .750 | 3.16 | 6 | 6 | 0 | 0 | 0 | 31.1 | 26 | 11 | 1 | 6 | 31 |
| Mike Joseph | 2045-2045 | 1 | 0 | 1.000 | 2.08 | 2 | 0 | 0 | 0 | 0 | 8.2 | 4 | 2 | 0 | 1 | 6 |
| Pedro Juárez | 2042-2042 | 0 | 1 | .000 | 3.57 | 7 | 2 | 0 | 0 | 0 | 17.2 | 17 | 7 | 1 | 5 | 10 |
