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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sylvain James | 1952-1952 | 5 | 6 | .455 | 6.50 | 17 | 17 | 0 | 0 | 0 | 91.1 | 133 | 66 | 18 | 30 | 59 |
| Mirko Janda | 1952-1953 | 4 | 8 | .333 | 5.94 | 19 | 12 | 4 | 0 | 0 | 109.0 | 161 | 72 | 17 | 30 | 53 |
| Juan Jaramillo | 1952-1953 | 11 | 9 | .550 | 4.42 | 26 | 18 | 2 | 1 | 1 | 136.1 | 174 | 67 | 16 | 36 | 94 |
| Alejandro Javier | 1955-1955 | 1 | 1 | .500 | 4.05 | 4 | 0 | 0 | 0 | 0 | 13.1 | 12 | 6 | 0 | 6 | 5 |
| Branislav Jeftanovic | 1953-1954 | 4 | 0 | 1.000 | 5.51 | 21 | 0 | 0 | 0 | 0 | 80.0 | 120 | 49 | 17 | 23 | 47 |
| Sung-min Jeon | 1952-1952 | 2 | 0 | 1.000 | 0.87 | 10 | 0 | 0 | 0 | 1 | 20.2 | 17 | 2 | 0 | 2 | 15 |
| Stevan Jigovic | 1952-1953 | 1 | 0 | 1.000 | 9.00 | 3 | 0 | 0 | 0 | 0 | 4.0 | 9 | 4 | 1 | 1 | 2 |
| Alex Jimenez | 1953-1954 | 6 | 6 | .500 | 6.49 | 21 | 13 | 0 | 0 | 2 | 79.0 | 125 | 57 | 15 | 32 | 58 |
| Kevin Johnson | 1952-1952 | 1 | 1 | .500 | 11.25 | 8 | 0 | 0 | 0 | 0 | 20.0 | 36 | 25 | 4 | 10 | 9 |
| Kaleb Jones | 1952-1954 | 2 | 1 | .667 | 2.31 | 14 | 0 | 0 | 0 | 5 | 23.1 | 15 | 6 | 3 | 9 | 24 |
| Sean Jones | 1953-1955 | 1 | 0 | 1.000 | 5.87 | 14 | 0 | 0 | 0 | 4 | 15.1 | 19 | 10 | 2 | 7 | 12 |
| Bob Jorgensen | 1953-1953 | 0 | 0 | .000 | 1.50 | 2 | 0 | 0 | 0 | 0 | 6.0 | 7 | 1 | 0 | 0 | 5 |
| Kung Jue | 1955-1955 | 0 | 0 | .000 | 1.17 | 3 | 0 | 0 | 0 | 0 | 7.2 | 7 | 1 | 0 | 3 | 4 |
