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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 | 1953-1953 | 6 | 5 | .545 | 5.56 | 14 | 14 | 1 | 0 | 0 | 89.0 | 108 | 55 | 8 | 20 | 51 |
| Mirko Janda | 1955-1955 | 1 | 1 | .500 | 4.46 | 12 | 0 | 0 | 0 | 0 | 34.1 | 41 | 17 | 4 | 11 | 16 |
| Juan Jaramillo | 1954-1954 | 6 | 12 | .333 | 6.54 | 20 | 20 | 3 | 0 | 0 | 129.1 | 178 | 94 | 16 | 44 | 62 |
| Sinisa Jeftanovic | 1958-1959 | 4 | 11 | .267 | 6.38 | 18 | 18 | 1 | 0 | 0 | 108.2 | 155 | 77 | 11 | 70 | 81 |
| Sung-min Jeon | 1953-1953 | 2 | 6 | .250 | 4.94 | 36 | 0 | 0 | 0 | 11 | 51.0 | 70 | 28 | 3 | 23 | 33 |
| Marshall Jessop | 1952-1954 | 13 | 16 | .448 | 5.41 | 33 | 33 | 9 | 0 | 0 | 249.2 | 341 | 150 | 22 | 80 | 152 |
| Stevan Jigovic | 1955-1955 | 0 | 1 | .000 | 7.84 | 6 | 0 | 0 | 0 | 0 | 10.1 | 17 | 9 | 1 | 5 | 5 |
| Alex Jimenez | 1956-1958 | 14 | 18 | .438 | 5.13 | 38 | 38 | 4 | 0 | 0 | 275.1 | 377 | 157 | 24 | 80 | 179 |
| Kevin Johnson | 1955-1955 | 0 | 1 | .000 | 72.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 8 | 0 | 5 | 0 |
| Kaleb Jones | 1957-1957 | 5 | 1 | .833 | 2.76 | 17 | 0 | 0 | 0 | 0 | 29.1 | 26 | 9 | 3 | 4 | 35 |
| Sean Jones | 1958-1959 | 9 | 6 | .600 | 3.67 | 45 | 0 | 0 | 0 | 8 | 76.0 | 83 | 31 | 4 | 21 | 60 |
| Bob Jorgensen | 1955-1956 | 2 | 5 | .286 | 4.26 | 20 | 0 | 0 | 0 | 5 | 31.2 | 40 | 15 | 3 | 9 | 26 |
