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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Corbin Jameson | 0-1 | 2 | 1 | .667 | 3.60 | 9 | 0 | 0 | 0 | 0 | 15.0 | 11 | 6 | 1 | 9 | 10 |
| Raúl Javier | 0-0 | 4 | 7 | .364 | 10.16 | 64 | 1 | 0 | 0 | 2 | 67.1 | 90 | 76 | 12 | 63 | 32 |
| Bill Jensen | -1-0 | 0 | 3 | .000 | 8.74 | 25 | 0 | 0 | 0 | 0 | 35.0 | 55 | 34 | 9 | 14 | 26 |
| Mario Jiménez | 0-0 | 4 | 3 | .571 | 9.61 | 51 | 0 | 0 | 0 | 0 | 59.0 | 85 | 63 | 8 | 35 | 30 |
| Joe Johnson | 0-0 | 2 | 4 | .333 | 5.43 | 32 | 1 | 0 | 0 | 0 | 59.2 | 66 | 36 | 3 | 45 | 37 |
| William Johnson | 8-0 | 27 | 27 | .500 | 3.62 | 71 | 71 | 2 | 0 | 0 | 473.0 | 471 | 190 | 53 | 140 | 405 |
| Walt Johnston | 0-0 | 12 | 6 | .667 | 5.28 | 53 | 17 | 5 | 1 | 3 | 177.1 | 200 | 104 | 33 | 80 | 91 |
| Sylvain Jolly | 1-0 | 13 | 11 | .542 | 2.88 | 159 | 0 | 0 | 0 | 29 | 190.2 | 170 | 61 | 12 | 58 | 111 |
| Barry Jones | -1-1 | 2 | 4 | .333 | 4.57 | 40 | 0 | 0 | 0 | 3 | 61.0 | 69 | 31 | 10 | 24 | 46 |
| Harrison Jones | 0-0 | 9 | 15 | .375 | 4.71 | 39 | 11 | 2 | 0 | 0 | 168.0 | 197 | 88 | 26 | 54 | 102 |
| John Jones | 0-0 | 0 | 2 | .000 | 7.24 | 7 | 2 | 0 | 0 | 0 | 13.2 | 18 | 11 | 1 | 9 | 9 |
| Tom Jones | -1-0 | 6 | 8 | .429 | 4.17 | 24 | 24 | 0 | 0 | 0 | 131.2 | 146 | 61 | 18 | 78 | 70 |
| Greg Jordan | 0-1 | 1 | 3 | .250 | 3.93 | 40 | 0 | 0 | 0 | 2 | 50.1 | 48 | 22 | 5 | 20 | 43 |
| Mimosa Joseph | 0-1 | 16 | 8 | .667 | 3.30 | 35 | 32 | 1 | 0 | 0 | 207.0 | 194 | 76 | 24 | 47 | 169 |
| Johnny Joyce | -1-0 | 1 | 6 | .143 | 8.10 | 44 | 0 | 0 | 0 | 0 | 56.2 | 82 | 51 | 8 | 45 | 49 |
| José Juárez | 0-1 | 8 | 5 | .615 | 3.96 | 17 | 17 | 2 | 0 | 0 | 131.2 | 119 | 58 | 17 | 47 | 99 |
| Juan Júlio | 17-0 | 76 | 64 | .543 | 3.45 | 275 | 149 | 20 | 6 | 7 | 1248.0 | 1182 | 478 | 110 | 331 | 898 |
