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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lubor Janousek | 1925-1925 | 9 | 4 | .692 | 4.41 | 21 | 15 | 6 | 0 | 0 | 138.2 | 163 | 68 | 2 | 35 | 7 |
| Jurg Janssen | 1926-1926 | 1 | 0 | 1.000 | 3.00 | 1 | 1 | 1 | 0 | 0 | 9.0 | 7 | 3 | 1 | 0 | 4 |
| Niegloslaw Jaworski | 1921-1924 | 2 | 0 | 1.000 | 4.09 | 21 | 0 | 0 | 0 | 4 | 33.0 | 45 | 15 | 1 | 9 | 2 |
| Charles Jennings | 1921-1926 | 2 | 6 | .250 | 4.66 | 66 | 0 | 0 | 0 | 11 | 92.2 | 124 | 48 | 1 | 24 | 7 |
| Scott Jensen | 1925-1926 | 5 | 6 | .455 | 3.51 | 12 | 11 | 7 | 0 | 0 | 92.1 | 105 | 36 | 2 | 25 | 23 |
| Mikkel Jepsen | 1921-1925 | 67 | 83 | .447 | 4.99 | 194 | 154 | 76 | 3 | 2 | 1258.0 | 1588 | 697 | 12 | 344 | 109 |
| Gair Johns | 1921-1925 | 14 | 16 | .467 | 5.51 | 49 | 36 | 10 | 1 | 0 | 284.1 | 390 | 174 | 5 | 87 | 30 |
| Ben Joppe | 1921-1925 | 13 | 13 | .500 | 4.74 | 39 | 30 | 11 | 0 | 0 | 245.0 | 304 | 129 | 3 | 67 | 15 |
| Sheedy Jordan | 1926-1926 | 1 | 1 | .500 | 4.91 | 2 | 2 | 1 | 0 | 0 | 14.2 | 20 | 8 | 2 | 7 | 6 |
| César Jourdan | 1921-1922 | 0 | 2 | .000 | 2.70 | 12 | 0 | 0 | 0 | 2 | 16.2 | 18 | 5 | 0 | 3 | 2 |
| Feliks Jukhtanov | 1921-1925 | 10 | 4 | .714 | 2.97 | 40 | 11 | 8 | 1 | 1 | 154.1 | 168 | 51 | 1 | 38 | 13 |
| Mikolas Juklicek | 1926-1926 | 0 | 0 | .000 | 11.25 | 1 | 0 | 0 | 0 | 0 | 4.0 | 7 | 5 | 1 | 2 | 1 |
