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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Freddi Jacobson | 1952-1954 | 17 | 20 | .459 | 3.86 | 48 | 44 | 6 | 1 | 0 | 310.0 | 325 | 133 | 35 | 112 | 167 |
| Robert Jakl | 1952-1959 | 24 | 31 | .436 | 3.26 | 86 | 73 | 7 | 1 | 0 | 543.1 | 516 | 197 | 37 | 231 | 306 |
| Radek Jezek | 1957-1958 | 3 | 6 | .333 | 2.86 | 25 | 0 | 0 | 0 | 3 | 50.1 | 45 | 16 | 4 | 18 | 31 |
| Ke-yue Jian | 1957-1958 | 3 | 2 | .600 | 2.28 | 18 | 0 | 0 | 0 | 0 | 59.1 | 44 | 15 | 9 | 29 | 26 |
| Wing-chiu Jiang | 1957-1957 | 0 | 0 | .000 | 3.38 | 1 | 0 | 0 | 0 | 0 | 5.1 | 6 | 2 | 1 | 1 | 2 |
| Andrusha Jolkevsky | 1952-1959 | 56 | 61 | .479 | 3.08 | 147 | 147 | 30 | 7 | 0 | 1096.1 | 1014 | 375 | 85 | 361 | 568 |
| Cheh Joo | 1952-1955 | 0 | 0 | .000 | 5.88 | 19 | 0 | 0 | 0 | 0 | 26.0 | 25 | 17 | 3 | 28 | 9 |
| Maxim Jukhtanov | 1952-1957 | 3 | 7 | .300 | 4.90 | 46 | 19 | 0 | 0 | 0 | 159.2 | 191 | 87 | 22 | 82 | 63 |
