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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Anders Jensen | 1952-1955 | 15 | 10 | .600 | 5.15 | 36 | 36 | 3 | 0 | 0 | 243.0 | 299 | 139 | 32 | 120 | 152 |
| Sung-min Jeon | 1954-1954 | 0 | 1 | .000 | 8.32 | 24 | 0 | 0 | 0 | 0 | 61.2 | 92 | 57 | 17 | 32 | 37 |
| Marshall Jessop | 1955-1959 | 3 | 3 | .500 | 4.80 | 27 | 5 | 3 | 0 | 0 | 93.2 | 111 | 50 | 5 | 39 | 54 |
| Stevan Jigovic | 1956-1959 | 5 | 4 | .556 | 4.60 | 54 | 0 | 0 | 0 | 2 | 103.2 | 135 | 53 | 14 | 22 | 76 |
| Alex Jimenez | 1958-1958 | 1 | 0 | 1.000 | 3.86 | 1 | 1 | 0 | 0 | 0 | 7.0 | 12 | 3 | 1 | 1 | 5 |
| Norm Johnson | 1954-1954 | 2 | 3 | .400 | 4.62 | 7 | 7 | 1 | 0 | 0 | 50.2 | 58 | 26 | 4 | 13 | 27 |
| Kaleb Jones | 1958-1959 | 4 | 3 | .571 | 7.63 | 38 | 0 | 0 | 0 | 1 | 79.0 | 96 | 67 | 23 | 43 | 75 |
| Sean Jones | 1957-1957 | 2 | 1 | .667 | 8.18 | 14 | 0 | 0 | 0 | 2 | 22.0 | 35 | 20 | 5 | 9 | 17 |
| Zier Jonkers | 1954-1955 | 10 | 7 | .588 | 5.24 | 19 | 19 | 1 | 0 | 0 | 123.2 | 159 | 72 | 11 | 55 | 101 |
| Zivota Jovic | 1952-1952 | 0 | 0 | .000 | 30.00 | 3 | 0 | 0 | 0 | 0 | 3.0 | 11 | 10 | 1 | 4 | 2 |
